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Join us in bringing joy to customer experience. Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves. As part of the Cloud Platform Engineering team, you will be building Five9’s Modern SaaS platform. An ideal candidate for us is an experienced engineer who is passionate about building high performance cloud platforms with automation first mindset and a brilliant problem solver and a creative self-starter. Key Responsibilities: Be part of Cloud Platform Infrastructure Team, focused on building hybrid-cloud solutions. Build automation capabilities towards common abstractions, tools, automation for CI/CD and progressive delivery of Cloud Native applications. Enable all Five9 development teams with Cloud Native developer workflow, conduct developer training and toolset to automate software delivery with a focus on Scale, HA. Design, and build secure, highly scalable, enterprise grade platform Tools. Document and communicate clearly of architecture and implementation solutions. Work closely with product managers, architects, testers, and development teams. Troubleshoot and support current Cloud platform in production. Key Qualifications: 7+ years of professional DevOps / production operations experience. 5+ years of Cloud Native application delivery experience. Strong Hands-on experience with CI/CD tools like GitLab, GitHub, Jenkins, etc., Intimate knowledge of public cloud infrastructures (GCP - Preferred, AWS, Azure). Hands-on experience working on core Cloud services – Kubernetes, Compute, Storage, Network, Virtualization, Identity and Access Management (IAM). Expert level in Current technology Stack Helm, K8S, Istio, GCP, AWS, GKE, EKS, Terraform, SRE/DevOps practices or equivalent. Strong proven experience in Infrastructure as Code (IaC), to be responsible for building robust platforms using automation. Experience building automation and deploying high quality software with test frameworks and CI/CD, Progressive Delivery. Strong development experience in one or more programming languages - Python, Terraform, Golang, Java, etc. Advanced knowledge of Linux based systems and runtimes. DevOps mindset and familiarity with the concept of Site Reliability Engineering – inherent sense of ownership through the development and deployment lifecycle. You understand what it takes to run mission critical software in production. Ability to prioritize tasks, work independently and work collaboratively in an agile environment. Workplace location: This role is fully remote for candidates who reside outside Porto, Maia, Matosinhos, Gondomar, Valongo e Vila Nova de Gaia. Candidates who reside within those municipalities would be required to work in-office 3 days a week. Benefits: Five9 Shares Bonus Scheme 10% Flex Benefit Meal Allowance Medical Insurance Life Insurance 25 day Annual Leave + Public Holidays Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer. Five9 is committed to providing reasonable accommodations for qualified individuals with disabilities throughout the application and interview process. If you need assistance or an accommodation due to a disability, please contact us at accommodations@five9.com to request an accommodation. Requests will be handled confidentially and in accordance with applicable law. View our privacy policy, including our privacy notice to California residents here: https://www.five9.com/pt-pt/legal . Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Join us in bringing joy to customer experience. Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves. To complement our rapid growth, we are actively looking for a Software Engineer – Data Platform with experience working on Google Cloud Platform, to join our team. Five9 delivers market-leading up-time for its Contact Center application while constantly delivering new features and capabilities to highly demanding enterprise customers. This requires that Five9 continually enhances, updates and modernizes the Platform Services that the Contact Center Application runs on. This position requires excellent understanding of cloud software: how it's built, deployed, tested and managed. Key Responsibilities: Contribute to the next generation of Five9’s modern SaaS platform and applications, providing businesses the ability to improve customer service through the power of AI in the Contact Center. You will play a critical role in developing a highly-available, highly-scalable and reliable infrastructure for microservices. You will apply your expertise of cloud computing stack, broad software technologies, and open source tools to resolve what are often considered seemingly unsolvable cloud technology platform challenges for our customers. Gain deep application-level knowledge of existing systems as well as contributing to their overall design. Dive deep into the software stack to troubleshoot and provide production support as needed. Work with a team of peers, share a passion for what they’re creating and pull your own weight. Requirements: 3+ years of software development experience as part of a Java development team using Spring Boot. 1+ years with Cloud Platform (AWS, Azure, GCP as plus) and Spring Cloud. Experience with designing and building highly available and scalable applications in GCP. Experience and hands on skills with GCP Products such as Google Big Query, Cloud Storage, Cloud Functions, Pub/Sub, App Engine, Cloud SQL. Experience and hands on skills with Docker, Kubernetes. Hands on experience working as part of a Continuous Delivery team who continuously develop, test, deploy and manage production applications on Google Cloud Platform. Good understanding of private and public cloud design considerations and limitations in the areas of virtualization and global infrastructure, distributed systems, load balancing and networking, event processing, massive data storage and security. Bachelor's degree in an engineering field. An advanced degree in an engineering or a business discipline is highly desirable. Workplace location: This role is fully remote for candidates who reside outside Porto, Maia, Matosinhos, Gondomar, Valongo e Vila Nova de Gaia. Candidates who reside within those municipalities would be required to work in-office 3 days a week. Benefits: Five9 Shares Bonus Scheme 10% Flexi Benefit Meal Allowance Medical Insurance Life Insurance 25 day Annual Leave + Public Holidays Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer. Five9 is committed to providing reasonable accommodations for qualified individuals with disabilities throughout the application and interview process. If you need assistance or an accommodation due to a disability, please contact us at accommodations@five9.com to request an accommodation. Requests will be handled confidentially and in accordance with applicable law. View our privacy policy, including our privacy notice to California residents here: https://www.five9.com/pt-pt/legal . Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Join us in bringing joy to customer experience. Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves. We are seeking a Staff Information Security Engineer to join Five9's Information Security team. This role will own the operationalization and ongoing maturity of Five9's Cyber Resiliency program (the practice of using tooling to continuously identify, prioritize, and remediate infrastructure resilience issues across our AWS, GCP, Azure cloud environments). You'll be responsible for program governance, tool ownership, process development, and engineering engagement to scale the program across the organization. As secondary responsibilities, you will support the Cloud Security program as a senior technical resource. Key Responsibilities: Cyber Resiliency Program (Primary) Own the operational lifecycle of the Cyber Resiliency program, including tool administration, system and resource mapping, criticality tiering, and issue triage workflows Develop and maintain program governance: process documentation, SLAs for remediation, escalation paths, and quarterly review cadences Build executive reporting for security and engineering leadership: resilience score trends, remediation velocity, IaC coverage, and risk exposure by system criticality tier Drive the communication plan for the program, ensuring engineering teams understand expectations before receiving remediation tickets Define and maintain issue prioritization frameworks that balance system criticality, environment, severity, and remediation effort Partner with engineering leads to drive remediation of infrastructure resilience issues, removing blockers and tracking progress through Jira Cloud Security (Supporting) Partner with the Cloud Security team on architecture reviews, policy development, and strategic initiatives across GCP, AWS, and Azure Develop and refine security guardrails, policy-as-code, and automated detection and response capabilities for cloud misconfigurations Evaluate and improve cloud security posture including IAM architecture, network segmentation, and workload protection Ensure cloud security solutions are under configuration management and deployed through CI/CD pipelines Requirements: 5+ years of experience in information security, with demonstrated experience in a senior technical role Experience operationalizing a security program or service: building governance, processes, and reporting, not just executing within an existing framework Deep hands-on experience with at least one major cloud platform (GCP strongly preferred), including IAM, networking, compute, and storage security Strong experience with infrastructure-as-code (Terraform required) and CI/CD pipelines Demonstrated ability to drive remediation and risk reduction across engineering teams without direct authority Experience building executive-level security reporting and metrics Excellent communication skills: able to present program status and risk to engineering leadership, security leadership, and executive audiences Self-directed with the ability to manage competing priorities across program operations and supporting workstreams Preferred Skills : Experience with cyber resilience or infrastructure resilience tooling (Gambit, Wiz, or similar CSPM/CNAPP platforms) Experience conducting risk assessments or security maturity assessments using frameworks such as NIST CSF, ISO 27001, or CMMI Background in Kubernetes security and container workload protection Experience with multi-cloud environments (GCP + AWS + Azure) Python scripting for automation and tooling Security certifications (CISSP, CCSP, SANS certifications, or similar) Prior experience in a SaaS, contact center, or communications platform environment Experience mentoring or technically leading junior engineers Workplace location : This role is fully remote for candidates who reside outside Porto, Maia, Matosinhos, Gondomar, Valongo e Vila Nova de Gaia. Candidates who reside within those municipalities would be required to work in-office 3 days a week. Benefits: Five9 Shares Bonus Scheme 10% Flex Benefit Meal Allowance Medical Insurance Life Insurance 25 day Annual Leave + Public Holidays Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer. Five9 is committed to providing reasonable accommodations for qualified individuals with disabilities throughout the application and interview process. If you need assistance or an accommodation due to a disability, please contact us at accommodations@five9.com to request an accommodation. Requests will be handled confidentially and in accordance with applicable law. View our privacy policy, including our privacy notice to California residents here: https://www.five9.com/pt-pt/legal . Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Join us in bringing joy to customer experience. Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves. We are looking for a Senior Information Security Engineer to join our growing Security Risk Management team. The Security Risk Management team aims to expand beyond traditional risk management; we are building an engineering driven program that designs, automates, and scales the controls, workflows, and tooling that protect Five9 and our customers. As a key contributor to the program the role supports the day-to-day execution of risk identification, assessment, treatment, and reporting across Five9's infrastructure, services, and acquisitions. You'll work directly with engineering, operations, and business stakeholders to surface security risks, drive them toward resolution, and maintain a clear picture of Five9's risk posture for leadership. Key Responsibilities: Identify, document, and assess security risks across Five9's environment, including production infrastructure, cloud services, corporate systems, and acquired platforms Maintain the Security Risk Register in Jira, ensuring risks are accurately categorized, assigned to appropriate owners, and tracked through their lifecycle Engage with service owners, engineering leads, and operations teams to establish risk ownership and drive remediation or mitigation plans Facilitate the risk acceptance process, including preparing risk acceptance documentation and coordinating approval with appropriate stakeholders Develop and deliver risk reporting for security leadership and executive audiences, including dashboards and metrics that communicate risk posture clearly Collaborate with compliance, vulnerability management, and other Information Security functions to ensure risk findings are incorporated into the broader security program Research and apply risk management frameworks and methodologies to continuously improve program maturity Contribute to the development of risk management policies, procedures, and playbooks Requirements: 3+ years of experience in information security, with at least 2 years focused on security risk management or GRC Demonstrated experience maintaining a security risk register and driving risk treatment decisions with cross-functional stakeholders Strong understanding of risk assessment methodologies (qualitative and quantitative) Familiarity with security frameworks such as NIST CSF, NIST 800-53, ISO 27001, PCI, or SOC 2 Ability to communicate security risks clearly to both technical and non-technical audiences Experience with Jira or similar tools for tracking and managing risk workflows Self-directed and comfortable engaging directly with service owners, engineers, and leadership to resolve ambiguity around risk ownership Preferred Skills : Experience with cloud environments (GCP, AWS, or Azure), particularly assessing risks related to cloud architecture and services Familiarity with vulnerability management programs and how they feed into risk management Experience supporting compliance audits or regulatory assessments (ISO 27001, SOC 2, PCI DSS) Experience building or contributing to security metrics, KPI dashboards, or executive reporting Prior work in a SaaS or contact center / communications platform environment Hands-on experience using agentic coding tools (Cursor, Claude Code, Copilot, etc.) and a working knowledge of Python Professional certification in Information Security or Risk Management (such as CISSP, CISM, CISA, CRISC, etc.) Workplace location: This role is fully remote for candidates who reside outside Porto, Maia, Matosinhos, Gondomar, Valongo e Vila Nova de Gaia. Candidates who reside within those municipalities would be required to work in-office 3 days a week. Benefits: Five9 Shares Bonus Scheme 10% Flex Benefit Meal Allowance Medical Insurance Life Insurance 25 day Annual Leave + Public Holidays Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer. Five9 is committed to providing reasonable accommodations for qualified individuals with disabilities throughout the application and interview process. If you need assistance or an accommodation due to a disability, please contact us at accommodations@five9.com to request an accommodation. Requests will be handled confidentially and in accordance with applicable law. View our privacy policy, including our privacy notice to California residents here: https://www.five9.com/pt-pt/legal . Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Join us in bringing joy to customer experience. Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves. Five9 has led the cloud revolution in contact centers, helping organisations transition from legacy premise-based solutions to the cloud. The cloud contact center market has become the hot space for innovation in real-time communications, and is the tip of the spear for the application of Artificial Intelligence, especially Generative AI and Large Language Models (LLM). Our innovative AI team is responsible for developing a suite of leading edge AI products built upon industry-leading AI tech from vendors like OpenAI, Google, and Amazon. These products include enterprise voice and chatbots (think: ChatGPT for businesses), agent assistance, and conversation analytics. This team - the fastest growing at Five9 - is seeking a talented and experienced Senior Front End React/Redux Software Engineer. In this role, you will be part of the team that builds software that brings AI technologies to users. Prior AI experience is not required - you will receive on-the-job experience for some of the hottest skills on the market. An ideal candidate for us is an experienced engineer who is passionate about building high performance web platforms and applications, a brilliant problem solver and a creative self-starter. Key Responsibilities: Implement UX designs by working with UX Designers on a day-to-day basis, using React/Redux based framework. Build custom widgets for dashboards developed using Google Looker Studio plugins. Be part of an agile team to develop a scalable, highly available application platform using modern PaaS platforms such as GCP. Participate and contribute to requirements analysis and grooming. Understand how to leverage PaaS components, such as CDN, noSQL databases when developing software in order to achieve scalability, reliability, and operability. Document and communicate clearly architecture and implementation solutions. Have ownership of your code in production, including on-call, troubleshooting. Key Skills: 5+ years software development experience. React/Redux focus. Highly proficient in JavaScript and TypeScript. Experience in operational code ownership – on-call, troubleshooting, uptime Experience in applying modern UI design patterns and separating concerns in a distributed system. Must have experience working within an Agile/Scrum team. Positive, self-motivated and enthusiastic attitude with a strong sense of ownership. Strong pro-active communication skills, both verbal and written. Experience in contact center software is a plus but not required. Experience with custom widget development using Google Looker Studio is a plus but not required. Workplace location: This role is fully remote for candidates who reside outside Porto, Maia, Matosinhos, Gondomar, Valongo e Vila Nova de Gaia. Candidates who reside within those municipalities would be required to work in-office 3 days a week. Benefits: Five9 Shares Bonus Scheme 10% Flexi Benefit Meal Allowance Medical Insurance Life Insurance 25 day Annual Leave + Public Holidays Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer. Five9 is committed to providing reasonable accommodations for qualified individuals with disabilities throughout the application and interview process. If you need assistance or an accommodation due to a disability, please contact us at accommodations@five9.com to request an accommodation. Requests will be handled confidentially and in accordance with applicable law. View our privacy policy, including our privacy notice to California residents here: https://www.five9.com/pt-pt/legal . Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Join us in bringing joy to customer experience. Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves. We are actively seeking a Senior DevOps Engineer to join our Product Engineering Core DevOps team. At Five9, we work in small teams and move fast to drive our products and business to the next level. We look for crucial skills in team members such as a problem-solving mindset and intellectual curiosity, along with comfortable integration into a deeply collaborative system that rewards impact. Key Responsibilities: Design, implementation, and automation of large-scale distributed systems Build tools and automation that help Five9 achieve higher availability, scalability, latency, and efficiency Work with Engineering teams to deliver high-quality software in a fast-paced environment Monitor production and development environments to build preventive measures and provide a seamless customer experience Work with delivery teams on software improvements to achieve higher availability and lower MTTD Participate in on-call rotation (8h shift, 7days a week, every 3-4 weeks) Key Requirements: 7+ years of public cloud experience (GCP or AWS) 7+ years of private cloud experience (Openstack, VMware ESXi) 7+ years of Linux experience (Centos/Ubuntu) 7+ years of networking experience Orchestration and management of containers using Kubernetes, Helm, GKE and Docker Experience with Gitlab, ArgoCD, CI/CD methodologies & tools Experience with Infrastructure as Code (Terraform), Python or other scripting languages Experience with Ansible config management tool Experience with Prometheus/Loki/Alertmanager/Grafana observability tools Excellent problem solving and analytical skills Experience with Incident Management Process, SRE best practices and continuous improvements Experience designing large scale distributed systems Familiar with DevOps/DevSecOps methodologies and best practices Strong verbal and written communications skills Bachelor's of Science degree in Computer Science or equivalent experience This role is hybrid and requires 3 days a week in office . Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer. Five9 is committed to providing reasonable accommodations for qualified individuals with disabilities throughout the application and interview process. If you need assistance or an accommodation due to a disability, please contact us at accommodations@five9.com to request an accommodation. Requests will be handled confidentially and in accordance with applicable law. View our privacy policy, including our privacy notice to California residents here: https://www.five9.com/pt-pt/legal . Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Join us in bringing joy to customer experience. Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves. We are actively seeking a Senior DevOps Engineer to join our Product Engineering Core DevOps team. At Five9, we work in small teams and move fast to drive our products and business to the next level. We look for crucial skills in team members such as a problem-solving mindset and intellectual curiosity, along with comfortable integration into a deeply collaborative system that rewards impact. Key Responsibilities: Design, implementation, and automation of large-scale distributed systems Build tools and automation that help Five9 achieve higher availability, scalability, latency, and efficiency Work with Engineering teams to deliver high-quality software in a fast-paced environment Monitor production and development environments to build preventive measures and provide a seamless customer experience Work with delivery teams on software improvements to achieve higher availability and lower MTTD Participate in on-call rotation (8h shift, 7days a week, every 3-4 weeks) Key Requirements: 7+ years of public cloud experience (GCP or AWS) 7+ years of private cloud experience (Openstack, VMware ESXi) 7+ years of Linux experience (Centos/Ubuntu) 7+ years of networking experience Orchestration and management of containers using Kubernetes, Helm, GKE and Docker Experience with Gitlab, ArgoCD, CI/CD methodologies & tools Experience with Infrastructure as Code (Terraform), Python or other scripting languages Experience with Ansible config management tool Experience with Prometheus/Loki/Alertmanager/Grafana observability tools Excellent problem solving and analytical skills Experience with Incident Management Process, SRE best practices and continuous improvements Experience designing large scale distributed systems Familiar with DevOps/DevSecOps methodologies and best practices Strong verbal and written communications skills Bachelor's of Science degree in Computer Science or equivalent experience This role is hybrid and requires 3 days a week in office . Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer. Five9 is committed to providing reasonable accommodations for qualified individuals with disabilities throughout the application and interview process. If you need assistance or an accommodation due to a disability, please contact us at accommodations@five9.com to request an accommodation. Requests will be handled confidentially and in accordance with applicable law. View our privacy policy, including our privacy notice to California residents here: https://www.five9.com/pt-pt/legal . Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.

Join us in bringing joy to customer experience. Five9 is a leading provider of cloud contact center software, bringing the power of cloud innovation to customers worldwide. Living our values everyday results in our team-first culture and enables us to innovate, grow, and thrive while enjoying the journey together. We celebrate diversity and foster an inclusive environment, empowering our employees to be their authentic selves. About Five9 Five9 is a leading provider of cloud software for the enterprise contact center market, bringing the power of the cloud to thousands of customers and facilitating more than three billion customer interactions annually. Since 2001, Five9 has led the cloud revolution in contact centers, helping organizations transition from legacy premise-based solutions to the cloud. Five9 provides businesses with cloud contact center software that is reliable, secure, compliant and scalable, which is designed to create exceptional customer experiences, increase agent productivity and deliver tangible business results. Role Overview To complement our rapid growth, we are actively sourcing for a Network Engineer to operate in a 24/7 Software-as-a-Service (SaaS) environment maintaining IP Networking components in a production setting. In this role you will: Design, engineer, and oversee highly scalable CI/CD pipelines for automated testing, digital-twin dry-running, and zero-downtime deployment of configurations across massive physical and virtual network fabrics. Champion the "Network-as-Code" paradigm, establishing enterprise-wide GitOps workflows and enforcing source control (Git) as the absolute single source of truth for all network state, policy, and infrastructure design. Drive the strategic vision for network automation, designing complex, reusable code frameworks and Playbooks to permanently eliminate manual configuration and operational "toil" at a global scale. Design and optimize massive-scale software-defined networks (SDN) and container networking interfaces (CNIs) supporting ultra-high-throughput, multi-region cloud and bare-metal environments. Serve as the ultimate technical authority (SME / Tier 4) for complex network, routing, and overlay issues, rapidly deciphering and resolving the most difficult challenges across physical underlays and software-defined layers. Design and implement next-generation telemetry, monitoring, and alerting-as-code platforms, leveraging advanced heuristics for proactive auto-remediation of performance, security, and capacity issues. Key Responsibilities Partner at a strategic level with Enterprise Designers, SRE leaders, and Platform teams to build and implement highly resilient, secure, and multi-tenant-isolated network infrastructure. Establish coding standards and write/review sophisticated Infrastructure-as-Code (IaC) using Ansible, Terraform, Helm, Python, and Bash. Lead the engineering, deployment, and optimization of modern overlay and container networking solutions, particularly VXLAN, OVN (Open Virtual Network), and Project Calico. Design the automation of complex security and traffic management policies across enterprise-grade firewalls (Palo Alto/Fortinet) and load balancers (F5 BIG-IP/Cloudflare/Octavia). Embed "Security-as-Code" directly into CI/CD pipelines, engineering automated validation gates for security groups, ACLs, and firewall rules prior to production pushes. Engineer robust, automated network validation suites to continuously verify network health, state, and complex routing tables (BGP, OSPF) pre- and post-deployment. Drive the adoption of code-based infrastructure definitions and dynamic, living technical documentation (e.g., NetBox, Git Markdown), setting the standard for documentation across the engineering organization. Qualifications & Skills 8+ years of progressive experience in Network Engineering, DevOps, or SRE roles, with a deeply established focus on large-scale network design, automation, and Infrastructure-as-Code (IaC). Expert-level proficiency in engineering complex network automation tooling utilizing Ansible, Terraform, and Python (including deep experience with network-specific libraries like Netmiko, Nornir, or NAPALM). Deep design and operational expertise with massive-scale software-defined networks (SDN) and overlays, specifically VXLAN, OVN, and Project Calico. Advanced mastery of Kubernetes networking designs (CNIs, Ingress controllers, Service Mesh, Kube-Proxy behaviors) at an enterprise scale. Extensive, expert-level experience engineering and automating enterprise edge, routing, and security fabrics, including Cisco Nexus (9k/7k/5k/2k), Arista, Versa SD-WAN, and firewalls (Palo Alto and Fortinet). Authoritative knowledge of API-driven application delivery and load balancing across monolithic and cloud-native stacks (e.g., F5 BIG-IP AS3, Cloudflare APIs, Octavia LBaaS). Deep Linux internals and networking expertise, including advanced knowledge of Linux network namespaces, virtual interfaces, eBPF/iptables, and kernel-level routing. CCIE-level (or equivalent) mastery of core routing protocols (BGP, OSPF, MPLS, EVPN) and a comprehensive understanding of how virtual/container overlay networks map to physical underlays. Extensive experience designing and scaling CI/CD platforms (e.g., GitLab CI, Jenkins, GitHub Actions) and implementing test-driven development (TDD) for infrastructure changes. Unparalleled troubleshooting capabilities utilizing advanced packet analysis (tcpdump/Wireshark), NetFlow, and log aggregation platforms to trace asymmetric routing and microburst traffic across hybrid fabrics. Proven track record of technical leadership, including mentoring mid-level engineers, leading design review boards, and driving cross-functional engineering initiatives. Deep telecommunications background, specifically VoIP, RTP, SIP peering/trunking, and Session Border Controllers (SBC), is highly advantageous. Exceptional verbal and written communication skills, with the ability to translate complex technical concepts to executive stakeholders while fostering a collaborative, DevOps-oriented engineering culture. Diversity & Inclusion Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer. This role is hybrid and requires 3 days a week in office . Five9 embraces diversity and is committed to building a team that represents a variety of backgrounds, perspectives, and skills. The more inclusive we are, the better we are. Five9 is an equal opportunity employer. Five9 is committed to providing reasonable accommodations for qualified individuals with disabilities throughout the application and interview process. If you need assistance or an accommodation due to a disability, please contact us at accommodations@five9.com to request an accommodation. Requests will be handled confidentially and in accordance with applicable law. View our privacy policy, including our privacy notice to California residents here: https://www.five9.com/pt-pt/legal . Note: Five9 will never request that an applicant send money as a prerequisite for commencing employment with Five9.