Careers at Klaviyo

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit klaviyo.com/careers to see how we empower creators to own their own destiny. Why You Should Join the PLS (Profiles, Lists and Segments) Team: The PLS team is responsible for building and scaling the core customer data experiences at Klaviyo — profiles, lists, and real-time segments . We own the tools that let customers understand who their users are, group them into meaningful audiences, and keep those audiences up to date as new data flows in. Our work underpins how customers target, personalize, and measure every message they send, making this product area core to Klaviyo’s continued success. As a Senior Software Engineer on the team, you’ll play a key role in designing and building scalable systems that power how customers manage and activate their data. Partnering closely with product managers, data scientists, and other platform teams, you’ll help define scope, translate complex data and UX problems into practical implementations, and build intuitive workflows that give customers confidence in their audiences. This role leans frontend, with a strong focus on crafting thoughtful, reusable components and seamless user experiences using technologies like TypeScript, React, Python, and Django. There are ample opportunities for growth given the scope of this role and the team’s central role in Klaviyo’s product. How You Will Make a Difference: You will be a core member of the PLS team, working on impactful customer-facing features that will make our product the best in the industry. You will work on creating easy-to-use editors that are highly performant. You will work closely with Product, Design, and Data Science to provide the best experience for our customers. You will mentor team members and drive initiatives that help the team learn new skills. Who You Are: 5+ years of experience in full-stack development with strong hands-on skills in React, Redux, JavaScript, HTML, and CSS, along with familiarity with general web best practices. Has a track record of delivering and shipping work powered by or accelerated through AI. Experience conducting code reviews and running a robust testing cycle using automated testing practices and frameworks, including end-to-end and integration tests (e.g., cypress, pytest). Experienced with RESTful and GraphQL APIs, and evolving APIs and data models to support product success. You take ownership of your work—from requirements and edge cases to implementation and testing—and are motivated by solving tough problems with others. Proven track record of leading complex, multi-quarter projects involving cross-team collaboration and being accountable for their outcomes Technologies We Use (not exhaustive): React, TypeScript, Redux Python, Django Amazon Web Services (EC2, RDS, Aurora, S3, etc.), Terraform, and other DevOps tools MySQL, RabbitMQ, Redis, ProxySQL We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025. Please see the independent bias audit report covering our use of Covey here Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process. Base Pay Range For US Locations: $148,000 — $222,000 USD This role may require up to 10% travel for purposes such as new hire onboarding, client or partner work if applicable, team meetings, and industry events. Travel is coordinated in advance. Get to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process . For more information about how we process your personal data, see our Job Applicant Privacy Notice . Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit klaviyo.com/careers to see how we empower creators to own their own destiny. Why You Should Join the Test Frameworks and Tooling Team Engineering confidence is our primary product. We are not testers, but rather infrastructure engineers building the sophisticated automation and CI/CD frameworks that make deploying to production a non-event. Our mission is to architect the systems, repository standards, and automated guardrails that empower every engineer in the company to ship at terminal velocity with total confidence. By building the foundational tools that guarantee production readiness, you will play a direct role in driving Sev-1 incidents toward zero and ensuring that our organization can move fast without the fear of breaking things. What You'll Achieve: Key Responsibilities As a core member of the team, you will own the execution of critical projects and contribute to the evolution of our testing ecosystem: Own and Enhance Frameworks: Take ownership of our integration and E2E testing frameworks across both backend and frontend stacks. You will ensure they are fast, reliable, and easy for other teams to adopt. CI/CD Integration: Contribute to how we execute tests within our CI system. You will focus on optimizing feedback loops so engineers know exactly where they stand in minutes. Establish Standards: Help define and implement general rules for our repositories, ensuring consistency in how unit tests are written and how code quality is measured. Scalable Feature & Coverage Contribution: Actively develop new tools that simplify complex testing scenarios while identifying and backfilling critical testing gaps at scale. You will build systems for data mocking and service isolation that ensure high-fidelity coverage across our most complex application flows. AI-Driven Quality Innovation: Help lead the charge in leveraging AI to accelerate our testing lifecycle. You will explore and implement AI-powered tools for automated regression detection, flaky test analysis, and intelligent test generation to decrease time-to-completion for features. Collaborative Problem Solving: Partner with feature teams to troubleshoot flaky tests and identify gaps in our current coverage, making proactive suggestions to improve our overall safety net. Operational Excellence: Monitor the health of our test suites and CI pipelines, taking pride in maintaining a stable and performant environment for the entire engineering organization. What Makes This Role Exciting Direct Impact on Stability: Your work is the primary line of defense against Sev 1 incidents. When the platform stays up and customers stay happy, it is because of the systems you help maintain. Full-Stack Visibility: Because you own the E2E suite, you will gain a deep understanding of how our entire ecosystem fits together, from frontend UI components to complex backend microservices. Autonomy and Growth: While we provide the vision, you provide the execution. You will have the space to own your work end-to-end, propose technical improvements, and see your suggestions implemented company-wide. High-Leverage Work: You are not just building one feature for one customer. You are building the tools that hundreds of your fellow engineers use every single day to do their jobs better. Who You Are: Analytical Problem Solver: You have 2+ years of software engineering experience with a focus on writing clean, maintainable code. You excel at debugging complex issues and performing root-cause analysis, using those learnings to implement systemic improvements that prevent future regressions. Quality Advocate: You find satisfaction in a well-organized test suite. You understand that testing is a fundamental part of the development lifecycle, not an afterthought. Technical Generalist: You are comfortable working across the stack. Whether it is debugging a React component in an E2E test or optimizing a Python integration test, you are ready to dive in. AI-Forward Thinker: You are excited about the intersection of AI and Software Quality. You are eager to help us leverage AI to automate test generation, identify flaky patterns, and accelerate the overall development lifecycle. Ownership Mindset: You do not just wait for tickets. You look for ways to make things better. You take pride in owning a project from the initial PR to its successful deployment and monitoring. CI/CD Familiarity: You have experience with, or a strong desire to learn, CI/CD tools and understand how automated testing fits into a modern deployment pipeline. Technologies we use (not exhaustive): Backend: Python, Django, Go Frontend: React, TypeScript, JavaScript Testing Frameworks: Playwright, Cypress, Pytest, Jest Infrastructure and CI: AWS, Kubernetes, Terraform, Helm, Buildkite Data: MySQL, Redis, Kafka AI Tools: Integration with Claude, Cursor, Copilot, or internal AI enablement frameworks Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process. Base Pay Range For US Locations: $116,000 — $174,000 USD This role may require up to 10% travel for purposes such as new hire onboarding, client or partner work if applicable, team meetings, and industry events. Travel is coordinated in advance. Get to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process . For more information about how we process your personal data, see our Job Applicant Privacy Notice . Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit klaviyo.com/careers to see how we empower creators to own their own destiny. Klaviyo is looking for a Senior Security Engineer to add to our growing Detection & Response Team. This is an engineering role that spans the full detection and response lifecycle - leveraging software development practices to build detections, triaging alerts, lead investigations, respond to incidents, perform threat hunting, and build the tooling that keeps us from doing the same work twice. As a member of the team, you will have the opportunity to work on complex large-scale security challenges across Klaviyo’s enterprise, cloud, and product environments, and shape how an engineering-first D&R function uses automation and AI in production, at scale, alongside talented and ambitious colleagues spanning multiple regions and timezones. How you will make a difference: Leverage engineering practices to develop, test, and deploy high-fidelity rule-based and anomaly-based detections-as-code Detect and respond to cyber threats using security data lake, SIEM, and cloud platforms Respond to alerts, cyber threats, and drive end-to-end incident response investigations Perform digital forensic investigations to include collection and analysis of evidence Automate and codify detection and response workflows and processes Build security tooling to drive automation across D&R lifecycle Improve and maintain detection and response pipelines and underlying systems Work with our Threat Intelligence team to identify and respond to sophisticated threats Develop AI-first security systems to automate detection and response operations Conduct threat hunts across corporate, cloud and product environments Support data engineering workflows for core security data lake and SIEM platforms Be an active member of D&R on-call rotations Coach and mentor security engineers within the detection & response team We’d love to hear from you if you have: 5+ years of hands-on security experience in modern cloud environments Experience in triaging and responding to cyber threats Experience in large-scale log analysis, incident response and/or digital forensics Experience with centralized security data lakes and SIEM solutions Hands-on experience in writing detections-as-code Solid data querying skills (e.g. SQL, Splunk) Familiarity with large-scale data pipelines and data engineering techniques Proficient in programming languages to automate / build (e.g., Python, Go or similar) Proven experience with git/GitHub and CI/CD automations Familiarity with tactics, techniques, and procedures used by threat actors Experience being part of detection and response or incident response on-call Engineering-first and AI-first approach for all work performed Strong passion for continuous learning and staying updated on evolving technology Strong oral and written communication skills Team player with a strong, self-managing work ethic Our salary range reflects the cost of labour in the country where the job post is advertised. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process. Base Pay Range in Local Currency: £84,000 — £126,000 GBP This role may require up to 10% travel for purposes such as new hire onboarding, client or partner work if applicable, team meetings, and industry events. Travel is coordinated in advance. Get to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process . For more information about how we process your personal data, see our Job Applicant Privacy Notice . Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit klaviyo.com/careers to see how we empower creators to own their own destiny. Why You Should Join the Developer Infrastructure Team Our core focus is empowering engineers to ship code efficiently and safely. We own the CI/CD pipelines and infrastructure automation that drastically improves developer productivity. As the Lead for this team, you will define the technical roadmap for the software pipeline from idea to delivery, enabling every engineer in the company to ship at terminal velocity with total confidence. By building the foundational tools that streamline the path to production, you will play a pivotal role in maximizing developer throughput, minimizing deployment friction, and ensuring our organization can move fast without the fear of breaking things. What You'll Achieve: Key Responsibilities As the technical leader for this team, you will drive the evolution of our CI/CD pipeline to enable fast, seamless development and deployments across the organization: Define Architectural Vision: Lead the long-term strategy for our CI/CD pipelines and frameworks across both backend and frontend stacks. You will ensure these systems are not just reliable, but world-class in their ease of adoption. CI/CD Strategy: Architect how we execute fast, reliable deployments and rollbacks. You will own the end-to-end delivery pipelines, ensuring the highest standards of security, efficiency, and compliance from code commit to production. Set Engineering Standards: Establish the standards for our repositories. You will define the benchmarks for PRs, cycle time, velocity, code quality metrics, and systemic reliability that all teams will follow. Scalable Tooling & Coverage: Design and build the next generation of tools that simplify CI/CD pipelines. You will lead efforts to help bring all teams and repos up to best in class standards at scale . AI-Driven Strategy: Spearhead our efforts to leverage AI within the CI/CD lifecycle as well as using AI to accelerate our own development efforts. Cross-Functional Leadership: Act as a consultant to feature teams to solve their most complex engineering challenges. You will use root-cause analysis from major incidents to propose and implement pillar-wide velocity improvements. Operational Excellence: Oversee the health and performance of our entire CI/CD pipeline, taking ultimate responsibility for the stability of the environment that hundreds of engineers rely on daily. What Makes This Role Exciting High-Leverage Leadership: You are not just building features; you are building the platform that defines the developer experience for the entire company. Innovation at the Edge: You will have the autonomy to experiment with emerging technologies like AI and LLMs to solve the age-old problems of flakiness and slow feedback loops. Pillar-Wide Influence: As a Lead, your decisions on testing standards and infrastructure will directly impact the speed and quality of every shipping team in the organization. Who You Are: Seasoned Technical Leader: You have 7+ years of software engineering experience with a history of leading complex, high-impact technical projects. You are a hands-on lead who stays close to the code while steering the broader vision. Master of Root-Cause Analysis: You don't just fix symptoms; you hunt down systemic failures. You excel at debugging deep-stack issues and transforming those lessons into automated preventions. Full-Stack Architect: You are comfortable designing systems across the stack. Whether it is a React-based quality dashboard or a Python service for data seeding, you understand how to build for scale. AI Visionary: You are passionate about the intersection of AI and Software Quality. You have a clear perspective on how AI can automate the mundane parts of testing and accelerate the SDLC. You’ve already experimented with AI in work or personal projects, and you’re excited to dive in and learn fast. You’re hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient. Extreme Ownership: You take pride in the end-to-end health of the platform. You are proactive in identifying technical debt and are a relentless advocate for engineering excellence. CI/CD Expert: You have deep experience with modern CI/CD tools and a sophisticated understanding of how to integrate automated testing into high-frequency deployment pipelines. Technologies we use (not exhaustive): Backend: Python, Django, Go Frontend: React, TypeScript, JavaScript Testing Frameworks: Playwright, Cypress, Pytest, Jest Infrastructure and CI: AWS, Kubernetes, Terraform, Helm, Buildkite Data: MySQL, Redis, Kafka AI Tools: Integration with Claude, Cursor, Copilot, or internal AI enablement frameworks Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process. Base Pay Range For US Locations: $176,000 — $264,000 USD This role may require up to 10% travel for purposes such as new hire onboarding, client or partner work if applicable, team meetings, and industry events. Travel is coordinated in advance. Get to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process . For more information about how we process your personal data, see our Job Applicant Privacy Notice . Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit klaviyo.com/careers to see how we empower creators to own their own destiny. At Klaviyo, we value the unique backgrounds, experiences, and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. About the team: Klaviyo’s global corporate Information Technology (IT) team is responsible for providing technology systems, administration, and support to Klaviyos around the world. Our main goal is to ensure that Klaviyos everywhere have a strong technology foundation to do great work. The IT Team solves problems using technology and provides Klaviyo’s continued scalability and sustainable employee growth in a rapidly evolving environment. The IT Systems team is primarily responsible for SaaS systems administration and end-to-end lifecycle management, building automation, and engineering solutions for both other internal teams and the business. The IT Systems team is highly collaborative, working closely with the IT Searchbar team, our end-user support team as well as with our Security, Networking, AI, Risk, and Trust teams, and the broader Engineering department. About the role: As an IT Systems Engineer on the IT Systems team, you will help design, implement, and maintain the enterprise systems every Klaviyo depends on identity, endpoint management, and the SaaS platforms that run the company. You’ll contribute to projects that range from SSO/SCIM implementations to multi-tool integrations and automations, with a focus on scalability and efficiency. You’ll work closely with operations, engineering, and the IT Searchbar team to keep systems healthy and help work through technical escalations. Klaviyo is building an AI-first future, and IT is where a lot of that gets real. You will be expected to use AI in your day-to-day work to research, script, document, and troubleshoot faster, and to help bring AI-assisted workflows to the systems we run for the rest of the company. This is a hands-on, high-learning role for someone early in their systems career who wants to build depth quickly alongside senior engineers. How you’ll have an impact Own your projects and tickets end to end from problem statement to rollout to documentation and when you see something broken, fix it or get it to the right owner rather than route around it. Ship changes quickly to systems that thousands of Klaviyos rely on, while testing your work, getting a peer review, and having a rollback plan before you touch production. Speed matters, and so does not skipping steps. Treat Klaviyos as your customers partner with stakeholders to build and improve the tooling, integrations, and documentation that make their work easier today and scale for where the business is headed. Leave behind clean configurations, least-privilege access, and runbooks and knowledge base articles good enough that the next person never has to ask you. Be clear on what success looks like for each project, and use ticket data, system telemetry, and adoption metrics to show the impact of what you built. Ramp on new platforms quickly, use AI to accelerate both your learning and your output, and treat feedback from your team as a gift. Requirements: 2+ years of hands-on experience in IT support, systems administration, or systems engineering, or equivalent practical experience through an apprenticeship, internship, help desk role, home lab, or certification-backed project work. Working familiarity with the admin side of core SaaS platforms such as Google Workspace, Jamf, Slack, Atlassian, and Zoom. Experience with problem identification and the ability to collaborate with stakeholders to find solutions. Foundational understanding of IT systems, including enterprise device management, secure identity, and endpoint security. Experience or familiarity with deploying and managing macOS and iOS devices through an MDM (Jamf preferred), including configuration profiles and policies. Exposure to Windows management such as Intune and Autopilot is a plus. Interest in learning how to automate workflows and repetitive tasks. Some experience with or willingness to learn IdP configuration, management, and maintenance, including SSO (SAML/OIDC) and SCIM provisioning. Experience with Okta or Entra ID (Azure AD) is a plus. Understanding of the importance of clean, concise controls and easily editable security functionality within tools, and a willingness to support access reviews and audit evidence requests for SOC 2 and SOX. AI proficiency: you already use AI as part of how you work. You are comfortable using LLM assistants and agents such as ChatGPT, Claude, Gemini, or Glean to research, draft and debug scripts, write documentation, and cut down repetitive work, and you can explain where AI accelerated you and where you applied your own judgment to verify its output. You are curious about applying AI to IT problems. Foundational scripting skills with an interest in further developing these skills. Experience with Bash, PowerShell, or Python is a plus. Familiarity with the identity lifecycle onboarding, role changes, and offboarding and why timely, accurate access matters. Comfort reading API documentation and working with REST and JSON to connect systems together, or a clear appetite to learn. A disciplined approach to change: you test before you deploy, document what you changed, and communicate clearly with the people it affects. Strong written communication and a habit of documenting your work. Participation in an after-hours on-call rotation with the IT Systems team is required for site-specific or business-blocking issues. Nice to have Familiarity with SSO and automation solutions such as Workato, Okta Workflows, n8n, or similar. Basic understanding of enterprise-scale networking topics including routing, DNS, DHCP, VPN, and corporate Wi-Fi. Experience in a fast-paced, high-growth IT environment is preferred. Interest in developing skills to build applications and tools that utilize APIs. Familiarity with AWS and GCP concepts such as VPC, EC2, Security Groups, ACLs, and IAM is a plus. Experience building with AI beyond the chat window prompt and context engineering, connecting an LLM to systems via APIs or MCP, or standing up an AI-assisted workflow or agent that saved real time. Experience administering an ITSM or ticketing platform such as Freshservice or Jira Service Management, including forms, workflows, and reporting. Relevant certifications such as Jamf 100/200, Okta Certified Professional, CompTIA A+, Network+, or Security+, or AWS, Azure, or Google Cloud fundamentals. Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process. Base Pay Range For US Locations: $96,000 — $144,000 USD This role may require up to 10% travel for purposes such as new hire onboarding, client or partner work if applicable, team meetings, and industry events. Travel is coordinated in advance. Get to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process . For more information about how we process your personal data, see our Job Applicant Privacy Notice . Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit klaviyo.com/careers to see how we empower creators to own their own destiny. At Klaviyo, we value the unique backgrounds, experiences, and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. About the team: Klaviyo’s global corporate Information Technology (IT) team is responsible for providing technology systems, administration, and support to Klaviyos around the world. Our main goal is to ensure that Klaviyos everywhere have a strong technology foundation to do great work. The IT Team solves problems using technology and provides Klaviyo’s continued scalability and sustainable employee growth in a rapidly evolving environment. The IT Systems team is primarily responsible for SaaS systems administration and end-to-end lifecycle management, building automation, and engineering solutions for both other internal teams and the business. The IT Systems team is highly collaborative, working closely with the IT Searchbar team, our end-user support team as well as with our Security, Risk, and Trust teams and the broader Engineering department. About the role: As a Senior IT Systems Engineer on the IT Systems team, you own the design, implementation, and long-term health of the enterprise systems Klaviyo runs on identity, endpoint management, and the SaaS platforms every Klaviyo touches. You will lead projects end to end, from SSO/SCIM rollouts to complex multi-tool integrations and automations, and you will be trusted to take an ambiguous business problem, define the problem statement yourself, and deliver a solution that scales. You will partner with operations, engineering, Security, and the IT Searchbar team, and act as a technical escalation point when systems break. Klaviyo is building an AI-first future, and IT is where a lot of that gets real. You will use AI fluently in your own work and help design AI-assisted workflows into the systems we run for the rest of the company. This is a senior individual contributor role: no direct reports, high autonomy, and real ownership. We are looking for someone who has already run systems at scale, holds opinions grounded in experience, and can be handed a domain and trusted to run it. How you’ll have an impact Own systems, not tickets. You will take a domain identity, endpoint, or a set of core SaaS platforms and be accountable for its reliability, security, and roadmap, raising the decisions that need to go higher and driving everything else yourself. Lead projects end to end at pace: scope the work, design the solution, plan the rollout and the rollback, communicate the change, and land it without skipping testing, peer review, or documentation to hit a date. Turn ambiguous business needs into clear problem statements and systems that hold up, so Klaviyos spend their time on their work instead of fighting their tools. Set the technical bar: clean configuration, least-privilege access by default, automation over manual toil, and runbooks the rest of the team can operate from without you in the room. Define what success looks like before you build, then prove it with data tickets deflected, provisioning time saved, coverage and compliance gaps closed. Raise the people around you: review others’ work, mentor engineers earlier in their careers, and give and receive direct, useful feedback. Act as a technical escalation point for complex system issues, drive root cause rather than symptoms, and feed what you learn back into the platform so the same incident does not happen twice. Requirements: 4+ years of hands-on experience as a systems engineer or systems administrator, with a track record of owning enterprise systems in production not just operating them, but deciding how they should work. You define problem statements yourself. You can take a vague or contested business need, scope it, drive alignment with stakeholders, and deliver with minimal direction without losing the thread when priorities shift. Deep working knowledge across a wide range of IT systems, including enterprise device management, identity and access management, and endpoint security. You have deployed and managed macOS and iOS devices at scale through an MDM (Jamf preferred), including configuration profiles, policies, and OS update strategy. Windows management (Intune, Autopilot) is a strong plus. You have administered core SaaS platforms such as Google Workspace, Slack, Atlassian, and Zoom, including their security and admin controls. Hands-on experience with IdP configuration, management, and maintenance: SSO (SAML/OIDC), SCIM provisioning, group and role design, and app onboarding. Experience with Okta or Entra ID (Azure AD) is preferred. You have owned the identity lifecycle in practice onboarding, role changes, and offboarding and understand the security and audit consequences of getting it wrong. AI proficiency: AI is already part of how you work, and you can show it. You use LLM assistants and agents to research, write and debug code, draft documentation, and compress routine work, and you exercise judgment about when to trust the output. You are actively interested in putting AI into the systems you run automating triage, enrichment, and repetitive workflows for the wider company. You automate by default, and you have the scripting skills to do it: Bash, PowerShell, or Python. Python is preferred and AWS Lambda experience is a plus. You have replaced manual, repetitive work with automation other people now rely on, and you can safely read and modify someone else’s script. Comfortable working with APIs REST, JSON, authentication, and rate limits and building integrations between systems that do not natively talk to each other. You value clean, concise controls and easily editable security functionality within tools, and you can produce evidence for access reviews and audits (SOC 2, SOX) without it derailing your week. Disciplined change management: you test, get peer review, plan rollback, communicate to affected users, and document what changed including under pressure. You can debug a system problem you have never seen before, drive it to the root cause, and communicate clearly to non-technical stakeholders while it is still unresolved. You can evaluate vendors and tools on their merits: security posture, integration surface, total cost and make a defensible recommendation. Strong written communication. Your documentation, runbooks, and change notices are good enough that other people can act on them without asking you. Participation in an after-hours on-call rotation with the IT Systems team is required for site-specific or business-blocking issues. Nice to have You have worked with Workato, Okta Workflows, n8n, or other similar SSO and automation solutions, and have built something non-trivial in one. Experience with enterprise-scale networking topics, including routing, DNS, DHCP, VPN, and building and maintaining multiple global office networks. Experience as a systems administrator or systems engineer in a fast-paced, high-growth IT environment, ideally supporting a globally distributed workforce. Experience building with AI beyond the chat window prompt and context engineering, connecting an LLM to systems via APIs or MCP, or running an AI-assisted workflow or agent in production. Experience with VPC, EC2, Security Groups, ACLs, and IAM in AWS and GCP. Experience with infrastructure-as-code (Terraform, Ansible) or version-controlled configuration management for IT systems. Experience administering an ITSM platform such as Freshservice or Jira Service Management, including forms, workflows, SLAs, and reporting. Relevant certifications such as Jamf 200/300, Okta Certified Professional or Administrator, or associate-level AWS, Azure, or Google Cloud. Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process. Base Pay Range For US Locations: $112,000 — $168,000 USD This role may require up to 10% travel for purposes such as new hire onboarding, client or partner work if applicable, team meetings, and industry events. Travel is coordinated in advance. Get to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process . For more information about how we process your personal data, see our Job Applicant Privacy Notice . Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit klaviyo.com/careers to see how we empower creators to own their own destiny. At Klaviyo, we value the unique backgrounds, experiences, and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. About the team: Klaviyo’s global corporate Information Technology (IT) team is responsible for providing technology systems, administration, and support to Klaviyos around the world. Our main goal is to ensure that Klaviyos everywhere have a strong technology foundation to do great work. The IT Team solves problems using technology and provides Klaviyo’s continued scalability and sustainable employee growth in a rapidly evolving environment. The IT Systems team is primarily responsible for SaaS systems administration and end-to-end lifecycle management, building automation, and engineering solutions for both other internal teams and the business. The IT Systems team is highly collaborative, working closely with the IT Searchbar team, our end-user support team as well as with our Security, Risk, and Trust teams and the broader Engineering department. About the role: As a Senior IT Systems Engineer on the IT Systems team, you own the design, implementation, and long-term health of the enterprise systems Klaviyo runs on identity, endpoint management, and the SaaS platforms every Klaviyo touches. You will lead projects end to end, from SSO/SCIM rollouts to complex multi-tool integrations and automations, and you will be trusted to take an ambiguous business problem, define the problem statement yourself, and deliver a solution that scales. You will partner with operations, engineering, Security, and the IT Searchbar team, and act as a technical escalation point when systems break. Klaviyo is building an AI-first future, and IT is where a lot of that gets real. You will use AI fluently in your own work and help design AI-assisted workflows into the systems we run for the rest of the company. This is a senior individual contributor role: no direct reports, high autonomy, and real ownership. We are looking for someone who has already run systems at scale, holds opinions grounded in experience, and can be handed a domain and trusted to run it. How you’ll have an impact Own systems, not tickets. You will take a domain identity, endpoint, or a set of core SaaS platforms and be accountable for its reliability, security, and roadmap, raising the decisions that need to go higher and driving everything else yourself. Lead projects end to end at pace: scope the work, design the solution, plan the rollout and the rollback, communicate the change, and land it without skipping testing, peer review, or documentation to hit a date. Turn ambiguous business needs into clear problem statements and systems that hold up, so Klaviyos spend their time on their work instead of fighting their tools. Set the technical bar: clean configuration, least-privilege access by default, automation over manual toil, and runbooks the rest of the team can operate from without you in the room. Define what success looks like before you build, then prove it with data tickets deflected, provisioning time saved, coverage and compliance gaps closed. Raise the people around you: review others’ work, mentor engineers earlier in their careers, and give and receive direct, useful feedback. Act as a technical escalation point for complex system issues, drive root cause rather than symptoms, and feed what you learn back into the platform so the same incident does not happen twice. Requirements: 4+ years of hands-on experience as a systems engineer or systems administrator, with a track record of owning enterprise systems in production not just operating them, but deciding how they should work. You define problem statements yourself. You can take a vague or contested business need, scope it, drive alignment with stakeholders, and deliver with minimal direction without losing the thread when priorities shift. Deep working knowledge across a wide range of IT systems, including enterprise device management, identity and access management, and endpoint security. You have deployed and managed macOS and iOS devices at scale through an MDM (Jamf preferred), including configuration profiles, policies, and OS update strategy. Windows management (Intune, Autopilot) is a strong plus. You have administered core SaaS platforms such as Google Workspace, Slack, Atlassian, and Zoom, including their security and admin controls. Hands-on experience with IdP configuration, management, and maintenance: SSO (SAML/OIDC), SCIM provisioning, group and role design, and app onboarding. Experience with Okta or Entra ID (Azure AD) is preferred. You have owned the identity lifecycle in practice onboarding, role changes, and offboarding and understand the security and audit consequences of getting it wrong. AI proficiency: AI is already part of how you work, and you can show it. You use LLM assistants and agents to research, write and debug code, draft documentation, and compress routine work, and you exercise judgment about when to trust the output. You are actively interested in putting AI into the systems you run automating triage, enrichment, and repetitive workflows for the wider company. You automate by default, and you have the scripting skills to do it: Bash, PowerShell, or Python. Python is preferred and AWS Lambda experience is a plus. You have replaced manual, repetitive work with automation other people now rely on, and you can safely read and modify someone else’s script. Comfortable working with APIs REST, JSON, authentication, and rate limits and building integrations between systems that do not natively talk to each other. You value clean, concise controls and easily editable security functionality within tools, and you can produce evidence for access reviews and audits (SOC 2, SOX) without it derailing your week. Disciplined change management: you test, get peer review, plan rollback, communicate to affected users, and document what changed including under pressure. You can debug a system problem you have never seen before, drive it to the root cause, and communicate clearly to non-technical stakeholders while it is still unresolved. You can evaluate vendors and tools on their merits: security posture, integration surface, total cost and make a defensible recommendation. Strong written communication. Your documentation, runbooks, and change notices are good enough that other people can act on them without asking you. Participation in an after-hours on-call rotation with the IT Systems team is required for site-specific or business-blocking issues. Nice to have You have worked with Workato, Okta Workflows, n8n, or other similar SSO and automation solutions, and have built something non-trivial in one. Experience with enterprise-scale networking topics, including routing, DNS, DHCP, VPN, and building and maintaining multiple global office networks. Experience as a systems administrator or systems engineer in a fast-paced, high-growth IT environment, ideally supporting a globally distributed workforce. Experience building with AI beyond the chat window prompt and context engineering, connecting an LLM to systems via APIs or MCP, or running an AI-assisted workflow or agent in production. Experience with VPC, EC2, Security Groups, ACLs, and IAM in AWS and GCP. Experience with infrastructure-as-code (Terraform, Ansible) or version-controlled configuration management for IT systems. Experience administering an ITSM platform such as Freshservice or Jira Service Management, including forms, workflows, SLAs, and reporting. Relevant certifications such as Jamf 200/300, Okta Certified Professional or Administrator, or associate-level AWS, Azure, or Google Cloud. Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process. Base Pay Range For US Locations: $112,000 — $168,000 USD This role may require up to 10% travel for purposes such as new hire onboarding, client or partner work if applicable, team meetings, and industry events. Travel is coordinated in advance. Get to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process . For more information about how we process your personal data, see our Job Applicant Privacy Notice . Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit klaviyo.com/careers to see how we empower creators to own their own destiny. Team Overview: As a Senior Software Engineer, Reliability, you’ll ensure Klaviyo’s critical platforms are reliable, scalable, and sustainable while enabling rapid product development. We treat reliability as a core product feature and use software engineering to solve complex systems and operational challenges. Our work spans security, infrastructure, and software development, requiring us to understand systems and engineering. We build complex, foundational solutions that must be extremely reliable, secure, and performant at global scale. Our charter is to build and operate foundational services and infrastructure, define clear reliability objectives, reduce operational toil through automation, and continuously improve systems based on real production learnings. The work is highly visible and directly impacts how Klaviyos build software and how customers experience Klaviyo every day. How You’ll Make an Impact: As a Senior Software Engineer, Reliability, you will build and operate the platforms, systems, and services that underpin Klaviyo’s reliability and operational excellence. You will: Build and operate foundational, security-critical services with a strong emphasis on availability, scalability, latency, and fault tolerance Apply software engineering principles to automate infrastructure, reduce operational toil, and improve system reliability at scale Design, implement, and evolve systems using SRE best practices Define and refine SLIs, SLOs, and error budgets to guide engineering decisions Improve observability, alerting, and incident response to reduce mean time to detection and recovery Participate in on-call rotations with a focus on sustainable operations and automatic remediations Perform quantitative analysis to understand system behavior, capacity constraints, and scaling limits Identify systemic risks and reliability bottlenecks and drive long-term, preventative solutions Collaborate closely with product, platform, and security engineers to influence architecture early and ship reliable systems Mentor and pair with other engineers, helping raise the bar for reliability, operational maturity, and engineering excellence Who You Are: You are a cloud-native, platform-focused SRE who uses software to build and operate reliable production systems at scale. You write and maintain production-quality code (e.g. Python, Go, or similar) to build internal platforms, automate operations, and improve system reliability You have built, deployed, and operated distributed, cloud-native systems and understand failure modes such as partial outages, dependency failures, resource saturation, and cascading impact You have experience operating containerized workloads and platforms (e.g. Kubernetes) in production, including deployment strategies, scaling behavior, and service networking You are comfortable participating in on-call rotations and diagnosing production issues You have designed and operated observability systems and know how to build actionable alerts that reflect real user and service impact You apply SRE concepts such as SLIs, SLOs, error budgets, and burn-rate–based alerting to guide engineering decisions and operational response You have hands-on experience with infrastructure as code and declarative configuration (e.g. Terraform, Kubernetes manifests, policy-as-code) You have performed capacity planning, load testing, and performance analysis for distributed services and platforms You routinely contribute to post-incident reviews and drive concrete, code-focused follow-up actions that prevent recurrence You are comfortable reviewing and contributing to technical designs, platform APIs, operational runbooks, and system documentation You’ve already experimented with AI in work or personal projects, and you’re excited to dive in and learn fast. You’re hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient. Nice to Have: Experience supporting security-critical platforms or building internal security tooling Familiarity with identity, access management, secrets management, or policy enforcement systems Experience operating systems at scale in cloud environments (AWS preferred) Background in resilience testing, fault injection, or chaos engineering A strong comprehension of algorithms and data structures at scale Tech Stack: Klaviyo’s platform is primarily built with Python and React and runs on AWS. Engineers join us from a wide range of technical backgrounds and are supported in learning our stack. Core technologies include: Python / Django / FastAPI MySQL / Redis / Memcached RabbitMQ / Celery / Apache Kafka / Apache Pulsar AWS / Terraform / Kubernetes Our salary range reflects the cost of labour in the country where the job post is advertised. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process. Base Pay Range in Local Currency: €92.000 — €138.000 EUR This role may require up to 10% travel for purposes such as new hire onboarding, client or partner work if applicable, team meetings, and industry events. Travel is coordinated in advance. Get to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process . For more information about how we process your personal data, see our Job Applicant Privacy Notice . Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit klaviyo.com/careers to see how we empower creators to own their own destiny. Klaviyo is looking for a Senior Security Engineer to add to our growing Detection & Response Team. This is an engineering role that spans the full detection and response lifecycle - leveraging software development practices to build detections, triaging alerts, lead investigations, respond to incidents, perform threat hunting, and build the tooling that keeps us from doing the same work twice. As a member of the team, you will have the opportunity to work on complex large-scale security challenges across Klaviyo’s enterprise, cloud, and product environments, and shape how an engineering-first D&R function uses automation and AI in production, at scale, alongside talented and ambitious colleagues spanning multiple regions and timezones. How you will make a difference: Leverage engineering practices to develop, test, and deploy high-fidelity rule-based and anomaly-based detections-as-code Detect and respond to cyber threats using security data lake, SIEM, and cloud platforms Respond to alerts, cyber threats, and drive end-to-end incident response investigations Perform digital forensic investigations to include collection and analysis of evidence Automate and codify detection and response workflows and processes Build security tooling to drive automation across D&R lifecycle Improve and maintain detection and response pipelines and underlying systems Work with our Threat Intelligence team to identify and respond to sophisticated threats Develop AI-first security systems to automate detection and response operations Conduct threat hunts across corporate, cloud and product environments Support data engineering workflows for core security data lake and SIEM platforms Be an active member of D&R on-call rotations Coach and mentor security engineers within the detection & response team We’d love to hear from you if you have: 5+ years of hands-on security experience in modern cloud environments Experience in triaging and responding to cyber threats Experience in large-scale log analysis, incident response and/or digital forensics Experience with centralized security data lakes and SIEM solutions Hands-on experience in writing detections-as-code Solid data querying skills (e.g. SQL, Splunk) Familiarity with large-scale data pipelines and data engineering techniques Proficient in programming languages to automate / build (e.g., Python, Go or similar) Proven experience with git/GitHub and CI/CD automations Familiarity with tactics, techniques, and procedures used by threat actors Experience being part of detection and response or incident response on-call Engineering-first and AI-first approach for all work performed Strong passion for continuous learning and staying updated on evolving technology Strong oral and written communication skills Team player with a strong, self-managing work ethic Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process. Base Pay Range For US Locations: $141,600 — $212,400 USD This role may require up to 10% travel for purposes such as new hire onboarding, client or partner work if applicable, team meetings, and industry events. Travel is coordinated in advance. Get to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process . For more information about how we process your personal data, see our Job Applicant Privacy Notice . Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit klaviyo.com/careers to see how we empower creators to own their own destiny. Klaviyo is looking for a Senior Security Engineer to add to our growing Detection & Response Team. This is an engineering role that spans the full detection and response lifecycle - leveraging software development practices to build detections, triaging alerts, lead investigations, respond to incidents, perform threat hunting, and build the tooling that keeps us from doing the same work twice. As a member of the team, you will have the opportunity to work on complex large-scale security challenges across Klaviyo’s enterprise, cloud, and product environments, and shape how an engineering-first D&R function uses automation and AI in production, at scale, alongside talented and ambitious colleagues spanning multiple regions and timezones. How you will make a difference: Leverage engineering practices to develop, test, and deploy high-fidelity rule-based and anomaly-based detections-as-code Detect and respond to cyber threats using security data lake, SIEM, and cloud platforms Respond to alerts, cyber threats, and drive end-to-end incident response investigations Perform digital forensic investigations to include collection and analysis of evidence Automate and codify detection and response workflows and processes Build security tooling to drive automation across D&R lifecycle Improve and maintain detection and response pipelines and underlying systems Work with our Threat Intelligence team to identify and respond to sophisticated threats Develop AI-first security systems to automate detection and response operations Conduct threat hunts across corporate, cloud and product environments Support data engineering workflows for core security data lake and SIEM platforms Be an active member of D&R on-call rotations Coach and mentor security engineers within the detection & response team We’d love to hear from you if you have: 5+ years of hands-on security experience in modern cloud environments Experience in triaging and responding to cyber threats Experience in large-scale log analysis, incident response and/or digital forensics Experience with centralized security data lakes and SIEM solutions Hands-on experience in writing detections-as-code Solid data querying skills (e.g. SQL, Splunk) Familiarity with large-scale data pipelines and data engineering techniques Proficient in programming languages to automate / build (e.g., Python, Go or similar) Proven experience with git/GitHub and CI/CD automations Familiarity with tactics, techniques, and procedures used by threat actors Experience being part of detection and response or incident response on-call Engineering-first and AI-first approach for all work performed Strong passion for continuous learning and staying updated on evolving technology Strong oral and written communication skills Team player with a strong, self-managing work ethic Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location. In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process. Base Pay Range For US Locations: $141,600 — $212,400 USD This role may require up to 10% travel for purposes such as new hire onboarding, client or partner work if applicable, team meetings, and industry events. Travel is coordinated in advance. Get to Know Klaviyo We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us. AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed. By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process . For more information about how we process your personal data, see our Job Applicant Privacy Notice . Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law. IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).