Senior Backend Engineer (Golang) - Balance Management

You'll work as a Senior Backend Engineer on SumUp's Global Bank team, building core banking infrastructure and services that provide merchants with digital bank accounts. You'll help modernize existing systems while creating a global transaction history service that unifies financial operations across all regions.

What you'll do

• Build and evolve SumUp's core banking services that power ledger operations and transactions, transforming regional systems into a unified global platform
• Tackle complex distributed systems challenges, ensuring resilient services under high transaction volumes
• Support modernization by improving observability, adding test coverage, and refactoring code without disrupting live banking operations
• Contribute to architectural decisions for building ledger and transaction history systems from the ground up
• Collaborate with Risk, Treasury, Finance, and Infrastructure teams for compliant global operations
• Take ownership from design to production, monitoring performance and continuously improving software delivery

What you'll need

• Solid backend experience building reliable, high-volume services with careful consideration of system design and APIs
• Proficiency in Golang and comfort learning other languages like Kotlin or Elixir
• Experience writing maintainable, well-tested code following CI/CD best practices
• Comfort building and deploying services in cloud environments like AWS using Docker and Kubernetes
• Eagerness to learn about relational databases that perform well under load
• Strong collaboration skills for working across regions and making technical decisions
• Curiosity for building reliable financial services and banking domain knowledge

Nice to have

• Knowledge of Elixir for working with legacy services
• Deeper PostgreSQL experience with performance tuning and schema design
• Experience with event streaming platforms like Kafka and observability stacks

What they offer

• Career growth opportunities with regular training, mentorship, and 2,000 EUR yearly learning budget
• Sabbatical program for tenured employees
• Health and wellness benefits including in-house fitness classes and subsidized Urban Sports Club
• Subsidized public transport, pension scheme, and language learning platform
• Virtual stock ownership program
• Diverse global team environment with employee resource groups