Careers at Sumup

About the team: You’ll join one of the teams within SumUp’s Identity Lifecycle Mission, working on some of the most critical building blocks behind the merchant journey, from onboarding and identity verification to KYC/KYB, regulatory data collection, and managing customer identity throughout the entire lifecycle. Today, many of these capabilities live across different flows, legacy services, and tightly coupled integrations. We’re on a journey to bring these pieces together into a more coherent, scalable platform, with shared data models, reusable services, and clear ownership boundaries. As a Senior Backend Engineer, you won’t just be maintaining existing systems. You’ll have the opportunity to shape how our identity platform evolves, modernise critical services, and help build foundations that can support new regulations, markets, and product requirements without reinventing the wheel every time. You’ll be part of one dedicated team, but the challenges we tackle often cross team and domain boundaries. You’ll work closely with Engineers, Product, Design, Compliance, Risk, and Operations, giving you the opportunity to influence solutions well beyond your own team. If you enjoy solving complex backend problems, working in a highly collaborative environment, improving reliability, and building scalable capabilities that enable other teams to move faster, this could be an exciting opportunity to make a real impact at SumUp. What you’ll do: Design, build, and operate scalable backend services, APIs, event-driven workflows, and system integrations. Build reusable capabilities that power merchant onboarding, identity verification, and KYC/KYB regulatory data collection. Drive reliability and resilience across critical services through better observability, failure handling, incident response, and long-term risk reduction. Work primarily with Go, while maintaining and progressively modernising existing services written in Java. Evolve domain models and service boundaries while reducing legacy complexity, duplicated logic, and tightly coupled integrations, always with a pragmatic, incremental mindset. Own your work end-to-end, from technical design and implementation to rollout and production follow-up. Work across team and domain boundaries, turning ambiguous product and regulatory requirements into clear, scalable technical solutions. Review code and designs, mentor engineers, and help raise engineering standards across the mission. You’ll be great for this role if you have: Strong professional experience building and operating production backend systems with high business impact. Experience working with Go and Java and confidence in maintaining and evolving existing Java services. Strong knowledge of API design, distributed systems, asynchronous processing, data modelling, testing, and system design. Experience with event streaming platforms such as Kafka and modern observability tools such as Grafana or Honeycomb. Experience deploying and operating services in cloud environments such as AWS, ideally with Docker and Kubernetes. A strong ownership mindset, with the ability to take complex problems from definition through to production. Experience improving the reliability of business-critical systems and turning recurring incidents into lasting engineering improvements. Strong communication skills and a collaborative approach to working across Engineering, Product, Compliance, Risk, and Operations. Nice to have: Experience in fintech, payments, KYC/KYB, identity verification, or regulatory systems. Experience translating regulatory and compliance requirements into clear, scalable engineering solutions, while helping bridge the gap between Compliance and Engineering. Why you should join SumUp: 🌍 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup 🧑‍🔬 We take learning and experimentation seriously with Hack Days every second Friday, and entire global Hack Weeks . 🌈 Commitment to Diversity and Inclusion: Be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced 📚 A dedicated annual L&D budget of €2,000 for attending conferences and/or advancing your career through further education 🚀 Enrolment onto our VSOP program: You will own a stake in SumUp’s future success 💶 A corporate pension scheme where we match up to 20% of your contributions 🔄 30 Days Sabbatical: Enjoy the unique opportunity to take a well-deserved break with our 30 days sabbatical benefit after completing 3 years of employment with SumUp 🔗 Referral Bonus: Earn additional rewards by referring talented individuals to join the SumUp team 🚵🏾‍♂️ Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, relocation assistance, subsidised office lunches SumUp is an Equal Employment Opportunity employer that proudly pursues and hires a diverse workforce. SumUp does not make hiring or employment decisions on the basis of race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by Company policy. SumUp also strives for a healthy and safe workplace and strictly prohibits harassment of any kind. About us: Be empowered to do more that matters. At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 36 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships. Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify. SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited. Explore career opportunities with us and join a team driven by collaboration, innovation, and a shared vision of creating a world where everyone can build a thriving business. Discover more about our vibrant and inclusive work culture and how we work on our careers website , and follow our journey on LinkedIn and Instagram . Job Application Tip We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.

About the team: The MarTech team builds the marketing and growth systems that help SumUp reach more merchants around the world. We combine backend engineering, data engineering, data science and external marketing platforms to create reliable, scalable solutions that improve conversion, increase operational efficiency and unlock new acquisition channels. Our work spans recommendation engines, promotion management, affiliate and referral platforms, campaign feed publishing, creative automation, localization and conversion tracking integrations that send signals to advertising platforms. We validate early ideas and prototypes into production-grade products that marketing teams can use independently, reducing manual work and helping campaigns reach customers faster. You will join a diverse and distributed team that works closely with stakeholders across Acquisition Engineering squads, Online Marketing, Content & Localization, Engagement and Platform Infrastructure. Because our systems sit at the intersection of technology, data and business growth, you will work on meaningful problems with multiple technical dependencies and a visible impact on SumUp’s acquisition strategy. What you’ll do: Design, build and operate reliable backend services that support marketing and growth initiatives. Own features and engineering projects from discovery and technical design through delivery and production support. Build integrations with internal and external platforms, ensuring reliable data flows and maintainable interfaces. Define and evolve architectures for distributed services and event-driven systems. Improve the reliability, quality and operational excellence of existing services. Collaborate with technical and non-technical stakeholders to clarify requirements, communicate trade-offs and shape priorities. Contribute to a high standard of engineering through testing, code reviews, documentation and pragmatic technical decisions. Support the growth of the team by pairing with peers, sharing knowledge and mentoring less experienced engineers. You’ll be great for this role if you have: 5+ years of professional backend engineering experience. Strong experience with Go and the wider Go ecosystem. Hands-on experience with distributed systems, microservices and event-driven architectures. Experience with event-streaming platforms and messaging brokers such as Kafka. Practical experience with DevOps practices and CI/CD tools, for example GitHub Actions or Argo CD. Experience building new systems while also maintaining and improving legacy services. A strong understanding of software architecture, service boundaries, APIs, data flows, testing and production operations. Excellent written and verbal communication skills, with the ability to explain technical concepts and trade-offs to both technical and non-technical stakeholders. Proven stakeholder-management skills and a collaborative approach to problem-solving. A strong sense of ownership and a commitment to writing clear, maintainable and testable code. Curiosity and enthusiasm for solving meaningful problems for users and the business. Nice to have: Experience in marketing technology, growth, acquisition or advertising platforms. Familiarity with React, TypeScript, or Python. Experience in fintech or a related industry. Why you should join SumUp: 🌍 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup 🧑‍🔬 We take learning and experimentation seriously with Hack Days every second Friday, and entire global Hack Weeks . 🌈 Commitment to Diversity and Inclusion: Be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced 📚 A dedicated annual L&D budget of €2,000 for attending conferences and/or advancing your career through further education 🚀 Enrolment onto our VSOP program: You will own a stake in SumUp’s future success 💶 A corporate pension scheme where we match up to 20% of your contributions 🔄 30 Days Sabbatical: Enjoy the unique opportunity to take a well-deserved break with our 30 days sabbatical benefit after completing 3 years of employment with SumUp 🔗 Referral Bonus: Earn additional rewards by referring talented individuals to join the SumUp team 🚵🏾‍♂️ Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, relocation assistance, subsidised office lunches SumUp is an Equal Employment Opportunity employer that proudly pursues and hires a diverse workforce. SumUp does not make hiring or employment decisions on the basis of race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by Company policy. SumUp also strives for a healthy and safe workplace and strictly prohibits harassment of any kind. About us: Be empowered to do more that matters. At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 36 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships. Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify. SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited. Explore career opportunities with us and join a team driven by collaboration, innovation, and a shared vision of creating a world where everyone can build a thriving business. Discover more about our vibrant and inclusive work culture and how we work on our careers website , and follow our journey on LinkedIn and Instagram . Job Application Tip We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.

Help build ML systems that make financial crime harder to hide Financial crime is constantly changing. New patterns and behaviours emerge all the time, and the data we work with is complex. Our work helps make financial activity safer and more trustworthy for merchants, customers, and SumUp. As a Senior Data Science/ML Engineer in the Risk AI Engineering Squad, you will build the production systems that turn machine learning into reliable, explainable transaction-monitoring capabilities. You will work across the full model lifecycle: understanding financial-crime typologies, exploring data, engineering features, training and validating models, deploying them at scale, and monitoring their performance over time. This role is designed for someone who is strongest on the engineering side of machine learning and wants to keep growing their data-science depth. You do not need to be a traditional data scientist or ML Engineer. We’re looking for someone who enjoys working across both disciplines: building robust, production-ready software while staying close to the data, models, and decisions those systems support. You will join a cross-functional team within the Risk & Compliance tribe, working closely with AML and Fraud Operations, investigators, Product, and Engineering. Together, we build data products and ML solutions that help Risk teams work smarter, faster, and more effectively — while keeping our controls robust, auditable, and compliant across products and markets. We actively welcome applications from women and people from underrepresented backgrounds. Diverse perspectives make our team stronger and our systems more robust. If you're motivated by technical depth, real-world impact, and the challenge of making ML work reliably in a high-stakes environment, this role is built for you. What you’ll do Build ML systems that work in production Own and evolve end-to-end batch training pipelines for transaction-monitoring models. Build reliable software around the model lifecycle, including testing, CI/CD, versioning, deployment, monitoring, and rollback. Improve the maintainability, observability, and scalability of our model pipelines. Partner with platform and software engineers to make model delivery repeatable and safe. Turn data and domain knowledge into better detection Build, maintain, and improve ML models for transaction monitoring, balancing detection quality, operational efficiency, explainability, and regulatory expectations. Engineer features that reflect AML and Fraud typologies and suspicious behaviours. Work with Risk investigators to translate domain knowledge into useful signals, alerting logic, and calibrated thresholds. Analyse the drivers of the AML Risk Score and recommend improvements to its features, logic, and thresholds. Keep models trustworthy over time Define and track meaningful model and operational metrics, including detection performance, alert volumes, and investigator outcomes. Monitor drift and model health, run back-testing, and investigate changes in performance. Run sensitivity tests on synthetic datasets and assess how models behave across relevant scenarios and populations. Produce model cards, technical documentation, and other ML governance artefacts that support auditability and regulatory review. Contribute to system-design documentation and adapt solutions to regional compliance requirements. Work across disciplines Partner with AML and Fraud Operations, Product, and Engineering to turn ambiguous problems into clear, scalable technical plans. Explain trade-offs clearly to both technical and non-technical stakeholders. Help the team improve its engineering practices, modelling approach, and understanding of financial-crime risk. Share what you learn and support a culture of thoughtful experimentation, constructive challenge, and continuous improvement. You’ll be great for this role if you have… Must have Strong production Python engineering experience. You write code that ships and are comfortable with automated testing, CI/CD, code review, versioning, observability, and operating services or pipelines in production. Experience deploying and operating ML models in production. You understand the practical realities beyond experimentation: reproducible training, model versioning, deployment, monitoring, incident response, and rollback. Hands-on experience with end-to-end ML pipelines. You have taken models from data preparation and training through validation and production use, and you understand how to choose appropriate KPIs and evaluation metrics. Solid data-engineering fundamentals. You have worked with complex, multi-source data ecosystems and care about data quality, lineage, reproducibility, and failure modes. A willingness to deepen your data-science expertise. You are interested in modelling, feature engineering, evaluation, and experimentation — even if your background is primarily in ML engineering or software engineering. Clear, confident communication. You can align stakeholders, set expectations, surface risks, and turn ambiguous compliance or operational requirements into a concrete technical plan. Nice to have Experience with PySpark or other distributed data-processing technologies. Experience in AML, fraud detection, transaction monitoring, or another financial-crime domain. Experience with unsupervised learning, such as anomaly detection or clustering. Familiarity with feature stores, model registries, and alerting-threshold calibration. Experience producing ML governance artefacts, such as model cards, validation reports, or audit documentation. Experience with AI systems and tooling. This role could be a strong fit if… You are an ML engineer who wants to become more involved in modelling and data science. You are a software or data engineer who has already shipped ML systems and wants to own more of the model lifecycle. You are a data scientist who genuinely enjoys production engineering, automation, testing, and operating models — not only training them in notebooks. You like working where technical decisions have a real-world impact and where reliability, explainability, and governance matter as much as model pe Why you should join SumUp 🌎 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup 🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced 🚀 Enrolment onto our Virtual Stock Option programme: you will own a stake in SumUp's future success 📚 A dedicated annual L&D budget of €2,000 for your individual development, which can be used to attend conferences and/or advance your career through further education 💶 A corporate pension scheme where we match up to 20% of your contributions 🏖️ Generous time off: enjoy 28 days of paid leave plus public holidays and special leave days 💪 Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, and subsidised office lunches 🌴 Break4me: 1-month sabbatical after 3 years of service 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team About SumUp Be empowered to do more that matters. At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 37 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships. Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify. SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited. Discover more about our culture and opportunities on our careers website , and follow our journey on LinkedIn , Instagram , and TikTok . Job Application Tip We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.

Location: Berlin, Germany (office first) Team description Our Platform Tribe builds Fleet, the infrastructure foundation that every engineering team at SumUp relies on to ship safely and quickly. Fleet gives teams a stable, self-service platform, built on AWS, Kubernetes and Terraform, so they can focus on their products instead of infrastructure bottlenecks. As part of the Cloud Infrastructure team, you'll take ownership of critical platform services, help modernise how we run Kubernetes at scale, and support engineers across the business as they build on top of what you maintain. If you enjoy solving complex infrastructure problems that quietly power everything else, this is where that work happens. What you'll do Design and maintain Terraform modules and infrastructure patterns that other engineering teams build on Manage production Kubernetes (EKS) clusters, including performance tuning and service mesh implementation Lead security and compliance work across frameworks such as PCI DSS and SOC2, partnering with the Security team Define and monitor service reliability metrics, take part in on-call rotation, and drive improvements after incidents Improve developer experience through automation, better CI/CD pipelines, and clearer documentation Mentor other engineers on the team and contribute to technical design discussions You'll be great for this role if… At least 8 years of experience in DevOps, platform, or infrastructure engineering Proven hands-on experience in software development (Go preferred, but anyone would be good) Experience designing and maintaining infrastructure as code, ideally with Terraform Strong knowledge of Kubernetes in production, including cluster operations and troubleshooting Hands-on experience with core AWS services such as EC2, VPC, IAM, and load balancing Comfort working within security and compliance requirements without slowing teams down Ability to mentor other engineers and explain technical decisions clearly to different audiences Why you should join SumUp 🎉 🌎 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup 🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced 🚀 Enrolment onto our Virtual Stock Option programme: you will own a stake in SumUp's future success 📚 A dedicated annual L&D budget of €2000 for your individual development, which can be used to attend conferences and/or advance your career through further education 💶 A corporate pension scheme where we match up to 20% of your contributions 🏖 Generous time off: enjoy 28 days of paid leave plus public holidays and special leave days 🩺 Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, subsidised office lunches 🌴 Break4me: 1-month sabbatical after 3 years of service 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team About SumUp Be empowered to do more that matters. At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 37 markets rely on SumUp as their financial partner to manage payments, finance, and customer relationships. Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify. SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited. Discover more about our culture and opportunities on our careers website , and follow our journey on LinkedIn , Instagram , and TikTok . 📽️ Want to bring this role to life on social or add a video to the posting? Check out the Global Employer Brand video library for ready-to-use assets. Job Application Tip We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.

Team description SumUp's Hardware Development team builds the physical products millions of small businesses rely on every day, and this role sits right at the start of a new chapter: moving our in-house hardware onto the Android platform for the first time. This isn't a typical Android device, it's a highly customised, security-first product built from scratch, which means the person joining will help define how the operating system, drivers, and secure processor come together rather than inheriting someone else's setup. The team works closely with hardware, software, and QA engineers across the bring-up process, so this role offers a rare chance to shape a product's foundations while working alongside experienced embedded and secure processor leads. What you'll do Support system bring-up for the new Android embedded platform, from bootloader through to kernel and framework Integrate and maintain kernel modules and drivers, including power management and connectivity components Contribute to build system integration across the platform Debug hardware and software issues at the protocol level and help resolve critical issues found during testing Carry out testing and validation to confirm the platform is stable and secure before release You'll be great for this role if… Experience developing embedded systems with a strong focus on Android OS, gained over several years in a professional setting Strong knowledge of the Android OS architecture, from bootloader (U-Boot, Little Kernel) and kernel through to framework and services Hands-on experience debugging hardware interfaces at protocol level, including I2C, SPI, UART, and SDIO Solid understanding of embedded security concepts such as Secure Boot, TrustZone (TEE), dm-verity, encryption, and hardware-backed key storage Comfort working with Qualcomm Snapdragon or MediaTek platforms, and expert-level C programming for embedded Linux environments Why you should join SumUp 🌎 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup 🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced 🚀 Enrolment onto our Virtual Stock Option programme: you will own a stake in SumUp's future success 📚 A dedicated annual L&D budget of €2000 for your individual development, which can be used to attend conferences and/or advance your career through further education 💶 A corporate pension scheme where we match up to 20% of your contributions 🏖 Generous time off: enjoy 28 days of paid leave plus public holidays and special leave days 🌈 Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, subsidised office lunches 🌴 Break4me: 1-month sabbatical after 3 years of service 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team About SumUp Be empowered to do more that matters. At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 38 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships. Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify. SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited. Discover more about our culture and opportunities on our careers website , and follow our journey on LinkedIn , Instagram , and TikTok . Job Application Tip We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.

The Localization team builds and owns the systems that make sure every merchant, in every one of our 38 markets, can understand and use our products in their own language. It's one of the most critical enablers of SumUp's global growth, sitting at the heart of how fast and how well we can go to market anywhere in the world. As our Senior Full Stack Engineer, you'll bring dedicated engineering ownership by working closely with the team to scope, build and ship the systems, integrations and tooling accelerate the ongoing evolution of our localization platform towards greater automation, scalability and end-to-end integration. If you want autonomy, meaningful scope, and the chance to shape a growing function, this is the role. What you'll do: Design, build and optimise localization solutions across product, CMS, CRM, marketing and design systems, so content moves faster without compromising quality Improve the localization management platform to give the team greater visibility and control while reducing manual steps Embed automated language and quality checks into several steps of the localization workflows, catching issues before they reach production Improve the experience for developers, designers, marketers and content teams by ensuring localization solutions support their processes and ways of working Partner with Web and Mobile, Website, Comms Platform and other technical teams to enable localization capabilities across the technology stack Explore how AI and language technology can strengthen and future-proof the localization stack, while ensuring solutions meet evolving compliance requirements. You'll be great for this role if: Strong background in backend engineering, ideally with Go (alternatively knowledge with Python, Rust or C++) Experience building and maintaining RESTful APIs in a microservices or distributed systems environment Working knowledge of databases such as PostgreSQL and event streaming tools such as Kafka Comfort translating priorities from non technical stakeholders into scoped, shippable engineering work Ability to operate independently across a fragmented, distributed system landscape, working within architecture owned by other teams Exposure to frontend frameworks such as Reactjs and languages like Typescript Experience working with translation management systems (TMS), or with the localization of web or mobile applications and other content platforms. Why you should join SumUp 🌎 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup 🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced 🚀 Enrolment onto our Virtual Stock Option programme: you will own a stake in SumUp's future success 📚 A dedicated annual L&D budget of €2000 for your individual development, which can be used to attend conferences and/or advance your career through further education 💶 A corporate pension scheme where we match up to 20% of your contributions 🏖 Generous time off: enjoy 28 days of paid leave plus public holidays and special leave days 🎁 Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, subsidised office lunches 🌴 Break4me: 1-month sabbatical after 3 years of service🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team About SumUp Be empowered to do more that matters. At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 38 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships. Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify. SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited. Discover more about our culture and opportunities on our careers website , and follow our journey on LinkedIn , Instagram , and TikTok . Berlin office Job Application Tip We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.

About the team: Within the Global Operations organisation, our mission is to build the best customer experience in the fintech industry by delivering an effortless customer experience to all our merchants. We are seeking a skilled and passionate Senior AI / Machine Learning Engineer to join our talented AI team and lead the development of AI models and algorithms that will drive our customer support service to new heights. As a Senior AI / Machine Learning Engineer at SumUp, you will be responsible for building and optimizing state-of-the-art AI models and algorithms. Your expertise with machine learning, deep learning, and LLMs will be crucial in driving the success of our AI-driven initiatives. You will work closely with cross-functional teams, including backend engineers, data scientists and product managers, to translate business requirements into innovative AI solutions. Your contributions will shape the future of our support products and help us stay at the forefront of technological advancements in the field of AI. What you’ll do Architect, design, develop and deploy our AI solutions and systems in production environments, ensuring reliability, high performance and scalability. Collaborate and communicate closely with data scientists, product managers, developers and other business stakeholders to bring state-of-the-art AI solutions to Customer Support, enhancing customer experience and improving operational efficiency. Develop and maintain ML infrastructure and pipelines to support efficient data processing, model training and serving. Optimize and fine-tune machine learning models to improve accuracy, efficiency and scalability. Collect, preprocess and clean large text datasets to ensure high-quality input for model training and evaluation. Embrace software development principles, best practices and industry standards, including version control, CI/CD processes and unit testing frameworks as your day-to-day work. Collaborate with cross-functional teams to ensure seamless integration of machine learning solutions into software applications and platforms. You’ll be great for this position if you have: Bachelor’s degree in Machine Learning, Computer Science or an engineering-related field. +8 years of proven experience working as a Machine Learning Engineer, focusing on building and deploying scalable machine learning or AI solutions and data-driven systems. Relevant experience building AI products, such as Chatbot Assistant, RAG system, etc. Excellent software development engineering skills to design computationally effective solutions and maintenance in large-scale production environments (data version control, model serving, continuous monitoring & alerting) Experience building and deploying ML models using cloud services (AWS, GCP, or Azure). Expert in Python and familiarity with MLOps tools (e.g., MLflow, Kubeflow, Airflow, Langfuse). Experience with machine learning workflow orchestration and algorithms optimisation, feature engineering pipelines, data ingestion and transformation. Good understanding of data pipelines, APIs, containers (Docker), and version control (Git). Excellent analytical and problem-solving skills, with strong attention to detail. You have working proficiency and communication skills in verbal and written English. Why you should join SumUp: 🌍 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup. 🌈 Commitment to Diversity and Inclusion: Be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced 📚 A dedicated annual L&D budget of €2,000 for attending conferences and/or advancing your career through further education. 🚀 Enrolment onto our VSOP program: You will own a stake in SumUp’s future success 💶 A corporate pension scheme where we match up to 20% of your contributions 🔄 30 Days Sabbatical: Enjoy the unique opportunity to take a well-deserved break with our 30 days sabbatical benefit after completing 3 years of employment with SumUp. 🔗 Referral Bonus: Earn additional rewards by referring talented individuals to join the SumUp team. 🚵🏾‍♂️ Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, relocation assistance, subsidised office lunches. About us: SumUp is a leading financial technology company, founded in 2012 with the goal of empowering small businesses around the globe. We’re the financial partner of choice for more than 4 million merchants in over 35 markets. We collectively build, plan and fine-tune the technology that drives SumUp and empowers small businesses around the world. We believe in the everyday hero. Those who have the courage to follow their passion and who have the strength and determination to realise their dreams. Small business owners are at the heart of all we do, so we're creating powerful, easy-to-use financial solutions to help them run their business. With a founders mentality and a 'team-first attitude' our diverse teams across Europe, South America, and the United States work together to ensure that small business owners can be successful doing what they love. SumUp is an Equal Employment Opportunity employer that proudly pursues and hires a diverse workforce. SumUp does not make hiring or employment decisions on the basis of race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by Company policy. SumUp also strives for a healthy and safe workplace and strictly prohibits harassment of any kind. Job Application Tip We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.

SumUp enables businesses to get paid easily, process orders quickly, sell online instantly and manage their money more efficiently. We create the tools businesses need to make their business and their customer experience thrive. The payments processing platform, consisting of other sub-platforms, has powered SumUp’s global business for more than 10 years now. It’s developed in Sofia by the Payments Tribe, composed of several teams (squads). Each squad is cross-functional, autonomous and co-located, working on its part of the platform end-to-end. We are scaling and improving existing products, while developing new ones - an exciting time to join. You would make an impact by improving and co-creating our existing and new microservices architecture platforms, solving scaling and new development challenges. Scalability and high availability are among our focus areas. What you’ll do Design and evolve systems that process millions of transactions reliably and at scale Build and maintain backend services in a microservices architecture Contribute to API design for internal services and external integrations Write clean, maintainable, and scalable code with strong test coverage Participate in architectural discussions and drive technical decisions Collaborate closely with engineers, QA, and DevOps to deliver production-ready systems Continuously improve engineering practices, including leveraging AI to iterate faster You will be great for this role if you have: Strong programming experience in any modern language (e.g. Go, Java, Python, Kotlin, etc.). We care more about how you think and design systems than the specific language you use Solid understanding of system design, scalability, and distributed systems Experience building APIs and working with data storage systems Ability to learn new technologies quickly and pragmatically Strong problem-solving skills and a structured way of thinking Ownership mindset and collaborative approach to teamwork Interest in incorporating AI as part of your development workflow Nice to have: Experience with cloud platforms (e.g. AWS) Familiarity with containers and orchestration (Docker, Kubernetes) Experience with event-driven systems and messaging (e.g. Kafka) If you don’t meet every requirement but are excited about the role, we’d still love to hear from you. Why you should join SumUp Make an impact on a global scale - our systems serve millions of merchants Learn from experienced engineers while working on complex, real-world problems Be part of a tech-agnostic team that uses the right tools for the job Collaborate with SumUppers worldwide on large-scale fintech products used by millions, based in our Sofia office (office-first setup). Access a €2,000 annual L&D budget to attend conferences or advance your career through education. Enjoy 25 days of paid leave (increasing with tenure), plus paid vacations for special occasions and a 1-month sabbatical every 3 years. Benefit from extra perks like health and life insurance, co-sponsored Multisport cards, childbirth/adoption bonuses, discounts, a referral program, 100 EUR monthly food vouchers, 40 EUR flexible benefits, and more. About SumUp We believe in the everyday hero. Small business owners are at the heart of all we do, so we create powerful, easy-to-use financial solutions to help them run their businesses. With a founder’s mentality and a 'team-first’ attitude, our diverse teams across Europe, South America and the United States work together to ensure that the small business owners we partner with can be successful doing what they love. SumUp is an Equal Employment Opportunity employer that proudly pursues and hires a diverse workforce. SumUp does not make hiring or employment decisions on the basis of race, color, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. SumUp also strives for a healthy and safe workplace and strictly prohibits harassment of any kind. SumUp will not accept unsolicited resumes from any source other than directly from a candidate. Job Application Tip We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.

Senior Platform Engineer – US Platform Team NOTE: We are unable to sponsor or take over sponsorship of an employment Visa at this time . 📍 Boulder, CO, USA | Full-time | Office First Check out our Boulder office Team description The US Platform team is the engineering backbone that keeps SumUp's product teams moving. We build and maintain the cloud infrastructure, tooling, and developer environments that hundreds of engineers across the US depend on every day. As we grow, we're making a deliberate investment in senior expertise to raise the bar on how we build, standardize, and connect our platform work globally. This is a pivotal role at the intersection of infrastructure and developer experience. You'll be the primary technical bridge between our US Platform team and our global Platform Infrastructure organization, ensuring both move in the same direction with shared standards, a unified codebase, and a clear roadmap. If you're energized by making complex systems simpler for the people who build on them, this is the role for you. What you'll do Design and implement infrastructure-as-code solutions, driving automation of manual processes and improving deployment speed and reliability across the US engineering organization Act as the technical connector between the US Platform team and the global Platform Infrastructure team, establishing shared standards, runbooks, and a joint technical roadmap Improve our monitoring, observability, and incident response processes, including cross-timezone on-call coordination and post-mortem practices Build internal tooling and self-service capabilities that help product engineering teams deploy, monitor, and scale services independently Lead the migration of US infrastructure into a unified, cohesive platform, treating our internal platform surfaces with the same intentionality we bring to customer-facing products You'll be great for this role if… Proven experience in platform, DevOps, or infrastructure engineering at a senior level in complex, distributed environments (~8+ years) Deep expertise in AWS services (EC2, S3, RDS, VPC, IAM, EKS) and advanced Kubernetes, including cluster design, multi-tenant management, and upgrade strategies Strong proficiency in Infrastructure as Code (Terraform and/or CloudFormation at scale) and CI/CD design using tools such as Jenkins, GitHub Actions, or ArgoCD Experience with service mesh technologies (Istio preferred), observability platforms (Prometheus, Grafana, ELK/OpenSearch), and proficiency in Go, Python, or JavaScript/TypeScript Comfort working across globally distributed teams, with the communication skills to influence both technical and non-technical stakeholders and the mindset to thrive in async, cross-timezone environments Compensation Base Salary range for this position is $160-$185K annually Stock Option Plan participation Compensation will be finalized based on the candidate’s experience and location Why you should join SumUp 🌍 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Boulder office. This involves an office-first setup 🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced 🚀 Enrollment onto our Virtual Stock Option program: you will own a stake in SumUp's future success 📚 A dedicated annual L&D budget for your individual development, which can be used to attend conferences and/or advance your career through further education 🏖 Generous time off: 22 days of paid vacation, plus an extra day each year up to 28 days, public holidays, quarterly Wellness Days, and special leaves 🏥 Health and life coverage: medical coverage via Cigna & Kaiser, plus life insurance 💼 Financial security: 401(k) retirement scheme with SumUp matching (100% on first 1%, 50% on 2–6%) 🌴 Break4me: 1-month sabbatical after 3 years of service🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team _________________________________________________________________ About SumUp Be empowered to do more that matters. At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 37 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships. Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify. SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, color, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited. Discover more about our culture and opportunities on our careers website , and follow our journey on LinkedIn , Instagram , and TikTok . #SumUpUSA Job Application Tip We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.

We believe in the everyday hero. Those who have the courage to follow their passion and who have the strength and determination to realise their dreams. Small business owners are at the heart of all we do, so we're creating powerful, easy-to-use financial solutions to help them run their businesses. With a founder’s mentality and a 'team-first’ attitude, our diverse teams across Europe, South America and the United States work together to ensure that small business owners can be successful doing what they love. About the team The Payments Experience team sits at the heart of how millions of small businesses receive their money. We build and maintain the backend services that power payout settings, payout instruments, and the tooling that keeps payments flowing reliably across 37 markets. Right now, the tam is working through a meaningful technical challenge: migrating legacy services off an ageing platform database while continuing to deliver new capabilities for merchants and internal teams. This is a great opportunity to join a small, focused squad where your contributions are visible, your code matters, and there's real space to grow your craft in a complex fintech domain. What you'll do: Build and ship features within the Payments Experience domain, including payout instrument flexibility per market and tooling to manage SUBA availability for sales teams Support the ongoing maintenance and operational health of the team's backend services, keeping them stable and reliable Contribute to decommissioning a legacy Ruby service that manages payout settings in the Dashboard and SuperApp, including cleaning up dependencies for a smooth transition Help remove Platform DB dependencies from the Bank Accounts service as part of a broader migration effort Take part in planning and refinement sessions, sharing technical assessments and effort estimates with the team You'll be great for this role if you have: Strong hands-on experience building applications in Go, with a solid grasp of core language concepts and the standard library. Comfortable working within microservices architectures and implementing or consuming RESTful APIs. Good knowledge of SQL databases, particularly PostgreSQL, and ability to write clean, efficient queries. Familiarity with containerised deployments using Kubernetes and experience working with AWS. Open to feedback, motivated to solve real engineering problems, and comfortable navigating multi-language codebases (the team works across Go and Ruby). Why you should join SumUp: 🌍 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our modern Sofia office. This involves an office-first setup 🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced 🚀 Enrolment in our Virtual Stock Option programme: you will own a stake in SumUp's future success 📚 A dedicated annual L&D budget of €2000 for your individual development, which you can be used to attend conferences and/or advance your career through further education 🏖 Generous time off: 25 days of paid leave, plus one extra day per year of service (up to 35) 🏥 Peace of mind: comprehensive health and life insurance - includes dental coverage 💪 Stay active: on-site yoga and a co-sponsored Multisport card offering access to hundreds of sports facilities 🍽 Meal support: benefit from a tax-free food voucher program (100 EUR per month) plus flexibility via our Re:Benefits platform (40 EUR) 🚌 Easy commute: free shuttle buses connecting directly to Joliot-Curie metro station 👶 Family-friendly: new baby bonus 🌴 Break4me: 1-month sabbatical after 3 years of service 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team About SumUp Be empowered to do more that matters. At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 37 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships. Our commitment to small businesses is reflected in our diverse team Opens in new window of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify. SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited. Discover more about our culture and opportunities on our careers website , and follow our journey on LinkedIn Opens in new window , Instagram Opens in new window , and TikTok Opens in new window . Job Application Tip We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.