Backend Engineer (Golang) - Bank Balance

The Balance Management Squad sits at the core of the Global Bank Platform, building core banking services that power ledger operations and transactions. You'll help modernize existing systems while balancing innovation with stability, collaborate with teams across regions, and build reliable services that manage diverse markets with different regulations.

What you'll do

• Build and evolve SumUp's core banking services that powers ledger operations and transactions, transforming regional systems into a unified, scalable global platform.
• Tackle complex distributed systems challenges, ensuring resilient services that continue to perform under high transaction volumes.
• Support modernization initiatives by improving observability, adding test coverage, refactoring code for long-term maintainability, and gradually introducing new architectural patterns without disrupting live banking operations.
• Contribute to key architectural decisions - build ledger and transaction history systems from the ground up, ensuring a globally scalable banking solution for clients.
• Collaborate with teams across Risk, Treasury, Finance, and Infrastructure to ensure smooth, compliant, and reliable global operations.
• Take ownership from design to production, running the services you build, monitoring their performance, and continuously improving how we deliver high-quality software at scale.

What you'll need

• Solid backend experience building reliable, high-volume services and careful thinking about system design, APIs, data modeling, and how services interact.
• Proficiency in Golang and comfort learning and working with other languages as needed, e.g. Kotlin or Elixir.
• Experience writing maintainable, well-tested code, following CI/CD best practices, and taking responsibility for software from development to production.
• Comfort building, deploying, and running services in cloud environments like AWS using Docker and Kubernetes.
• Eagerness to learn about relational databases that perform well under load and maintain data consistency.
• Ability to collaborate across regions, communicate clearly, exchange feedback effectively, and make thoughtful technical decisions together.

Nice to have

• Knowledge of Elixir - some legacy services are written in Elixir.
• Deeper PostgreSQL experience including performance tuning, complex queries, or schema design.
• Experience with event streaming platforms (Kafka preferred) and modern observability stacks (Grafana, Honeycomb, etc.).

What they offer

• Career growth through regular training, mentorship programs, and yearly learning budget of 2,000 EUR.
• Health and wellness benefits including in-house fitness classes, gym access, subsidized Urban Sports Club, and psychotherapy sessions.
• Sabbatical program for tenured employees.
• Stock ownership program.
• Subsidized public transport, Kita placement assistance, pension scheme, and language learning platform.