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About the team: We are the Merchant Risk Intelligence team within SumUp’s Risk & Compliance tribe. We build systems that help protect SumUp and its merchants from fraud while supporting reliable, compliant business growth. Our team combines software engineering, machine learning, data science, product management and risk expertise. You will join a multidisciplinary group currently working across backend services, data products and AI-powered solutions. The team is growing its software engineering capabilities to develop Sentinel, our entity-level investigation and actioning framework, and to support broader risk and compliance use cases. You will bring dedicated Golang expertise to the team while also contributing to Python-based services and AI-agent initiatives. We value pragmatic engineering, thoughtful collaboration and the ability to balance delivery speed with security, reliability and long-term maintainability. What you’ll do: Develop new functionality and support existing services across the tribe’s codebase, primarily using Go Contribute to the continued development of our in-house merchant risk decision framework, taking it beyond its MVP and enabling new fraud prevention, risk and compliance use cases. Design, build and maintain reliable distributed systems and backend services. Work closely with product managers, data scientists, machine learning engineers, fraud strategy teams and operational stakeholders to turn complex problems into practical solutions. Help shape technical direction, service boundaries and system design decisions across the team. Contribute to Python projects, including AI-agent initiatives, as you build a broader understanding of the team’s systems. Participate in code reviews, testing, monitoring and continuous improvement of production services. Use AI-assisted development tools thoughtfully to deliver meaningful features faster without compromising code quality, security or maintainability. Be open to participating in an on-call rotation as the team’s production responsibilities and support model evolve. You’ll be great for this role if you have: Professional experience developing software with Go/Golang Experience building and operating distributed systems and backend services Strong system design skills and an understanding of reliable, maintainable software architecture. Experience working with Kubernetes and Kafka Working knowledge of Python and an interest in contributing to Python-based products or AI/agentic development Experience using AI-assisted tools as part of your software development workflow Experience working in agile, cross-functional teams and collaborating with stakeholders beyond engineering A pragmatic, outcome-focused approach: you know how to define a valuable MVP, make sensible trade-offs and improve solutions iteratively A collaborative mindset and the confidence to challenge ideas constructively while remaining open to feedback Motivation to learn about fintech, fraud prevention, risk and compliance domains Why you should join SumUp: 🌍 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Sofia 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 🏖️ Generous time off: 25 days of paid leave, plus one extra day per year of service (up to 35), along with public holidays and special leave options 🔄 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 🍽️ Meal support: benefit from a tax-free food voucher program plus flexibility via our Re:Benefits platform 🚌 Easy commute: free shuttle buses connecting directly to Joliot-Curie metro station 🏥 Peace of mind: additional health insurance and life insurance 💪 Stay active: on-site yoga and a co-sponsored Multisport card offering access to hundreds of sports facilities 🔗 Referral Bonus: Earn additional rewards by referring talented individuals to join the SumUp team 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: We are the Merchant Risk Intelligence team within SumUp’s Risk & Compliance tribe. We build systems that help protect SumUp and its merchants from fraud while supporting reliable, compliant business growth. Our team combines software engineering, machine learning, data science, product management and risk expertise. You will join a multidisciplinary group currently working across backend services, data products and AI-powered solutions. The team is growing its software engineering capabilities to develop Sentinel, our entity-level investigation and actioning framework, and to support broader risk and compliance use cases. You will bring dedicated Golang expertise to the team while also contributing to Python-based services and AI-agent initiatives. We value pragmatic engineering, thoughtful collaboration and the ability to balance delivery speed with security, reliability and long-term maintainability. What you’ll do: Develop new functionality and support existing services across the tribe’s codebase, primarily using Go Contribute to the continued development of our in-house merchant risk decision framework, taking it beyond its MVP and enabling new fraud prevention, risk and compliance use cases. Design, build and maintain reliable distributed systems and backend services. Work closely with product managers, data scientists, machine learning engineers, fraud strategy teams and operational stakeholders to turn complex problems into practical solutions. Help shape technical direction, service boundaries and system design decisions across the team. Contribute to Python projects, including AI-agent initiatives, as you build a broader understanding of the team’s systems. Participate in code reviews, testing, monitoring and continuous improvement of production services. Use AI-assisted development tools thoughtfully to deliver meaningful features faster without compromising code quality, security or maintainability. Be open to participating in an on-call rotation as the team’s production responsibilities and support model evolve. You’ll be great for this role if you have: Professional experience developing software with Go/Golang Experience building and operating distributed systems and backend services Strong system design skills and an understanding of reliable, maintainable software architecture. Experience working with Kubernetes and Kafka Working knowledge of Python and an interest in contributing to Python-based products or AI/agentic development Experience using AI-assisted tools as part of your software development workflow Experience working in agile, cross-functional teams and collaborating with stakeholders beyond engineering A pragmatic, outcome-focused approach: you know how to define a valuable MVP, make sensible trade-offs and improve solutions iteratively A collaborative mindset and the confidence to challenge ideas constructively while remaining open to feedback Motivation to learn about fintech, fraud prevention, risk and compliance domains Why you should join SumUp: 🌍 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Sofia 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 🚀 Enrollment onto our VSOP program: You will own a stake in SumUp’s future success 🏖️ Generous time off: 25 days of paid leave. 🔄 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 🏥 Peace of mind: additional health insurance and life insurance 💪 Stay active: gym allowance 🔗 Referral Bonus: Earn additional rewards by referring talented individuals to join the SumUp team 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.

In the Global Bank tribe , we are building the infrastructure and core services needed to provide our merchants with a digital bank account that empowers them to be successful at doing what they love. Our goal is to become the most popular banking partner for small merchants globally by offering a high-quality banking experience tailored to their needs—effortless, simple, and affordable. Joining the Global Bank tribe means playing a key role in helping us build SumUp's digital bank. You’ll collaborate with a global, autonomous, cross-functional team that refines an aspect of our product from concept to execution. Work alongside colleagues from 32 nationalities across Cologne, Berlin, São Paulo, Sofia, London and Vilnius, united by a shared commitment to taking ownership, working with purpose, and helping small businesses thrive. As a Backend Engineer , you will play a key role in helping us transition from a localized setup with regional banks to a unified Global Bank. A significant challenge will involve supporting the move to a fully distributed, event-driven architecture. Our tech stack includes Go, AWS, Kafka, PostgreSQL, and Kubernetes, supported by a strong observability toolchain with Prometheus, Grafana, and Honeycomb. We also actively use AI‑assisted development tools such as Cursor, GitHub Copilot, and others. SumUp’s engineering culture is built around ownership. We follow a “build it, run it, improve it” model, with strong observability and a focus on learning. Engineers have clear scope and autonomy, with decisions documented, reviewed, and made collaboratively. The Vilnius team is a core part of the Global Bank domain. We own production systems, shape technical direction, and work closely with colleagues across SumUp’s global offices on critical merchant banking capabilities. Join our Vilnius Team today ( Vilnius office ). What You’ll Do Collaborate with a global team to design and build a unified global banking platform. This includes high-level APIs for multiple regions and local implementations, ensuring high availability and observability Be part of the transformation team that is transforming monolithic services into decoupled, highly scalable, region-agnostic, unified global bank services Design, implement, and iteratively develop highly available backend services, while continuously evaluating and implementing new methods to ensure the high reliability of transfer systems Maintain and improve core services utilizing a modern, cloud-native technology stack (AWS, K8s), with microservices written in Golang, Kotlin and Java and Elixir. Improve test coverage for existing services and drive the end-to-end delivery of changes, including testing, observability, and monitoring. Shape and continuously improve our engineering culture by sharing ideas, refining best practices, exploring innovative solutions, and contributing to comprehensive documentation and tool selection. You’ll be great for this role if Solid programming experience in Golang and are interested in working with additional languages such as Java, Kotlin and Elixir. You have advanced understanding of developing and maintaining distributed and event-driven systems. You have solid experience with event streaming platforms and messaging brokers such as Kafka You have experience with modern cloud technologies like AWS, and containerization tools such as Docker and Kubernetes You feel comfortable working with SQL and NoSQL databases You are experienced with CI/CD tools like GitHub Actions or ArgoCD You take pride in your work, have a keen sense of ownership, and are dedicated to writing clear, maintainable, and testable code. Any of the following would be considered a plus Experience with monitoring tools - Prometheus, Grafana, Honeycomb Experience in the fintech industry Why you should join SumUp 🌎 We’re a truly global team of 3200+ skilled professionals from 92+ countries, spread across 4 continents. Join the team from our Vilnius office. 🌈 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 🏖️ Time off: 25 days of paid leave, plus special holidays 🏥 Peace of mind: health insurance through Gjensidige and life & accidental coverage from Ergo 💪 Stay active: gym membership allowance to help you keep fit on your terms 📚Career growth and learning opportunities: We invest in your development through regular training, mentorship programs, SumUp University cohort and a yearly learning budget (2,000 EUR) 💡We take learning and experimentation seriously with Hack Days every second Friday, and entire global Hack Weeks . 🌴 Break4me: 1-month sabbatical after 3 years of service 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team. Compensation: From senior level in Lithuania is 4,366 to 7,280 Euro Gross p/m + 2000 EUR annual learning budget + Virtual Stock Options. Offer may vary based on skills and experience About SumUp At SumUp, we’re on a mission to empower small businesses around the world with simple, affordable tools to help them start, run, and grow. More than 4 million merchants across 37 markets trust us as their financial partner — and we’re just getting started. We’re a global team of 3,000+ people from over 90 nationalities, united by curiosity, collaboration, and care. Our core values and culture shape everything we do, fostering inclusion, learning, and belonging. SumUp is proud to be an Equal Employment Opportunity employer, committed to building a safe, respectful, and diverse workplace where everyone can thrive. 👉 Explore more about our culture on our careers site , or follow us on LinkedIn and Instagram . 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. 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: 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.