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# Senior Backend Engineer (Golang) - Bank Balance

- **Company:** SumUp
- **Location:** Berlin, Germany
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Amazon Web Services, Architectural Patterns, Code Coverage, Continuous Integration, Relational Databases, Distributed Systems, PostgreSQL, Performance Tuning, Cloud Platform System, Grafana, Backend, Kotlin, Apache Kafka, Docker, Elixir, Golang
- **Published:** October 23, 2026
- **Apply:** https://startup.jobs/senior-backend-engineer-golang-bank-balance-sumup-9947477

## About the Role

* 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.
 * Are fluent in 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

 * 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.)

## Description

As a Senior Backend Engineer, 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.

If you enjoy solving complex problems on high-load systems, are curious about banking, and are looking for a team that tackles challenges head-on, we'd love to hear from you.

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.