Senior Backend Engineer (Golang) - Bank

What You'll Do

• Build and evolve the SumUp's core banking services that powers ledger operations and transactions, transforming our 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 our 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.

You'll be great for this role if

• You have solid backend experience building reliable, high-volume services and you think carefully about system design, APIs, data modeling, and how services interact.

• You are proficient in Golang and comfortable learning and working with other languages as needed, e.g. Kotlin or Elixir.

• You write maintainable, well-tested code, follow CI/CD best practices, and take responsibility for the software you build from development to production.

• You're comfortable building, deploying, and running services in cloud environments like AWS using Docker and Kubernetes.

• You're eager to learn about relational databases that perform well under load and maintain data consistency.

• You are a collaborator who enjoys working across regions, communicating clearly, exchanging feedback effectively, and making thoughtful technical decisions together.

• You have a curiosity for building reliable financial services and banking domain

It's a plus if you have

• Knowledge of Elixir - some of our legacy services are written in Elixir, and while it's not essential, it would be useful if you've worked with it before

• Deeper PostgreSQL experience - we rely heavily on Postgres, so if you've done performance tuning, complex queries, or schema design, that's a plus

• Experience with event streaming platforms (Kafka preferred) and modern observability stacks (Grafana, Honeycomb, etc.)