Responsibilities
- Build and evolve core banking services supporting ledger operations and transactions.
- Develop a globally scalable transaction history and balance management platform.
- Solve distributed-systems challenges for resilient services operating under high transaction volumes.
- Modernize existing systems through improved observability, test coverage, refactoring, and new architectural patterns.
- Contribute to architecture and build ledger and transaction history systems from the ground up.
- Collaborate with Risk, Treasury, Finance, and Infrastructure teams on compliant and reliable operations.
- Own services from design through production, including deployment, monitoring, and continuous improvement.
Requirements
- Solid backend experience building reliable, high-volume services, with knowledge of system design, APIs, data modeling, and service interactions.
- Proficiency in Go and/or Kotlin, with willingness to work in other languages such as Elixir.
- Ability to write maintainable, well-tested code and take ownership from development through production.
- Experience building, deploying, and running services in cloud environments such as AWS using Docker and Kubernetes.
- Willingness to learn relational databases and maintain performance and data consistency under load.
- Strong collaboration and communication skills for working across regions and making technical decisions jointly.
- Interest in building reliable financial and banking services.
- Preferred: Elixir experience, advanced PostgreSQL skills including performance tuning, complex queries, or schema design, and experience with Kafka and observability tools such as Grafana and Honeycomb.
Benefits
- Vilnius office-based work with a global, diverse team.
- 25 days of paid leave plus special holidays.
- Health insurance through Gjensidige and life and accidental coverage from Ergo.
- Gym membership allowance.
- Training, mentorship, SumUp University, and a EUR 2,000 annual learning budget.
- Virtual Stock Option programme.
- Hack Days every second Friday and global Hack Weeks.
- One-month sabbatical after three years of service.
- Referral bonus programme.
Tech Stack
Categories
About SumUp
SumUp is a leading global fintech company committed to levelling the playing field for small businesses. Founded in 2012, we’re the trusted partner of over 4 million merchants in 37 markets, providing simple and affordable tools that help them manage payments, finance, and customer relationships. Our vision is a world where everyone can build a thriving business. Guided by this, we champion small business ownership by creating accessible solutions that empower entrepreneurs to grow and succeed. Our diverse team of over 3,000 SumUppers — representing more than 90 nationalities across 20 offices worldwide — is at the heart of our success. Beyond business, we donate 1% of the net revenue generated by Solo devices to environmental causes and support educational and entrepreneurial initiatives around the world. Recognised as a Top Global Employer for inclusion by the Stonewall Workplace Equality Index in 2022 and 2023, and awarded Fintech Diversity Initiative of the Year at the Irish National Fintech Awards in 2025, SumUp continues to build an inclusive, supportive, and purpose-driven workplace where everyone belongs.