Backend Engineer (Golang) - Balance Management

The Balance Management Squad sits at the core of the Global Bank Platform. 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.
• 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 thinking carefully about system design, APIs, data modeling, and how services interact.
• Proficiency in Golang and comfortable learning and working with other languages as needed, e.g. Kotlin or Elixir.
• Write maintainable, well-tested code, follow CI/CD best practices, and take responsibility for the software you build from development to production.
• Comfortable building, deploying, and running services in cloud environments like AWS using Docker and Kubernetes.
• Eager to learn about relational databases that perform well under load and maintain data consistency.
• Collaborator who enjoys working across regions, communicating clearly, exchanging feedback effectively, and making thoughtful technical decisions together.
• Curiosity for building reliable financial services and banking domain.

Nice to have

• Knowledge of Elixir - some legacy services are written in Elixir.
• Deeper PostgreSQL experience - 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 and learning opportunities including training, mentorship programs, and yearly learning budget of 2,000 EUR.
• Health & wellness benefits including in-house fitness classes, gym, subsidized Urban Sports Club, and psychotherapy sessions.
• Sabbatical program for tenured employees.
• Virtual stock ownership program.
• Subsidized Public Transport Card, Kita placement assistance, Pension Scheme, Language Learning platform.