Senior Backend Engineer - Money Transfers

Join our team and contribute directly to platform-level architecture that will shape how SumUp moves money at scale - work that directly impacts millions of small businesses every day.

Our tech stack includes Kotlin, Java, Go, a bit of Elixir, 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.

🎥 Get a feel for life in our Berlin office.

What you'll do

• Build and maintain backend services that sit at the heart of SumUp's transfer infrastructure, taking end-to-end ownership from development through to observability, testing and production support

• Contribute to the migration from market-specific services toward a unified global transfer platform, working across a mix of active services and legacy systems being decomposed

• Raise well-scoped pull requests, conduct thorough code reviews, and help maintain high standards of code quality and test coverage across the team

• Participate in incident reviews and the on-call rotation, taking accountability for the reliability of the services you build

• Contribute to the technical roadmap by participating in architectural discussions and proposing solutions for complex, distributed systems challenges

• Apply AI tooling to accelerate your own engineering workflows and contribute to raising the team's overall AI literacy

You'll be great for this role if…

• Solid experience as a Backend Software Engineer in modern languages (e.g. Kotlin, Go, Java, etc.). Kotlin is the team's primary language and we also work with Java, Golang, and Elixir.

• Solid understanding of distributed systems and event-driven architecture. Experience with async processing and messaging tools like Kafka (or similar).

• Experience working with microservice architectures, including Spring Boot and event-driven patterns, alongside solid knowledge of relational databases and API design

• Comfortable working in high-throughput, regulated environments where reliability matters. Defensive coding and attention to edge cases are part of the job

• Clear communicator in written and spoken English, with a collaborative approach to working across global teams

• Curious about the product impact, not just the code. Comfortable thinking about how backend decisions affect the end user experience.

Why you should join SumUp

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🌎 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

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🌈 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

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🚀 Enrolment onto our Virtual Stock Option programme: you will own a stake in SumUp's future success

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📚 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

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💶 A corporate pension scheme where we match up to 20% of your contributions

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🏖 Generous time off: enjoy 28 days of paid leave plus public holidays and special leave days

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🏙 Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, subsidised office lun