Senior Backend Engineer - Money Transfers

SumUp builds simple, affordable financial tools that help over 4 million small businesses across 37 markets get paid, manage their money, and grow. Beyond card payments, we offer a full suite of financial products - business banking, lending, invoicing, and money transfers - giving merchants everything they need in one place. Our Transfers Excellence squad sits within SumUp's Global Bank , and owns the core services that power how merchants and consumers move money.

g. IBAN-based transfers, money in and out, and peer-to-peer payments via the SumUp consumer app. With the high volume transfers per hour across our European markets.

That means reliability isn't a nice-to-have - it's the baseline for us. Right now, the team is replacing a set of market-specific implementations with a single, unified global transfer platform that will serve Europe, the UK, Brazil, Chile, and eventually the US and Canada. 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

g. ). 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 🌎 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office.