Senior Backend Engineer

In the Global Bank tribe, we are building the infrastructure and core services needed to provide our merchants with a digital bank account that empowers them to be successful at doing what they love. Our goal is to become the most popular banking partner for small merchants globally by offering a high-quality banking experience tailored to their needs—effortless, simple, and affordable.

Joining the Global Bank tribe means playing a key role in helping us build SumUp's digital bank. You’ll collaborate with a global, autonomous, cross-functional team that refines an aspect of our product from concept to execution. Work alongside colleagues from 32 nationalities across Cologne, Berlin, São Paulo, Sofia, London and Vilnius, united by a shared commitment to taking ownership, working with purpose, and helping small businesses thrive.

As a Senior Backend Engineer, you will play a key role in helping us transition from a localized setup with regional banks to a unified Global Bank. A significant challenge will involve supporting the move to a fully distributed, event-driven architecture. Join our Vilnius team!

What You’ll Do

• Collaborate with a global team to design and build a unified global banking platform. This includes high-level APIs for multiple regions and local implementations, ensuring high availability and observability
• Be part of the transformation team that is transforming monolithic services into decoupled, highly scalable, region-agnostic, unified global bank services
• Design, implement, and iteratively develop highly available backend services, while continuously evaluating and implementing new methods to ensure the high reliability of transfer systems
• Maintain and improve core services utilizing a modern, cloud-native technology stack (AWS, K8s), with microservices written in Golang, Kotlin and Java and Elixir.
• Improve test coverage for existing services and drive the end-to-end delivery of changes, including testing, observability, and monitoring.
• Shape and continuously improve our engineering culture by sharing ideas, refining best practices, exploring innovative solutions, and contributing to comprehensive documentation and tool selection.

You’ll be great for this role if 

• Solid programming experience in Golang and are interested in working with additional languages such as Java, Kotlin and Elixir.
• You have advanced understanding of developing and maintaining distributed and event-driven systems.
• You have solid experience with event streaming platforms and messaging brokers such as Kafka
• You have experience with modern cloud technologies like AWS, and containerization tools such as Docker and Kubernetes
• You feel comfortable working with SQL and NoSQL databases
• You are experienced with CI/CD tools like GitHub Actions or ArgoCD
• You take pride in your work, have a keen sense of ownership, and are dedicated to writing clear, maintainable, and testable code.

Any of the following would be considered a plus

• Experience with monitoring tools - Prometheus, Grafana, Honeycomb
• Experience in the fintech industry

Why you should join SumUp

• Be part of a company that values diversity and celebrates unique perspectives.
• Work with a global team of skilled professionals in an environment that fosters collaboration, learning, and growth.
• Be part of a global tribe building a banking solution from the ground up and delivering impactful solutions to the real-life problems of millions of SumUp merchants all over the world
• 25 days annual leave + Birthday Leave
• Career growth and learning opportunities: We invest in your development through regular training, mentorship programs, SumUp University leadership cohort and a yearly learning budget (2,000 EUR)
• Enrollment onto our virtual stock ownership program - you will own a stake in SumUp’s future success
• The opportunity to work on large scale fintech products used by millions of businesses around the world
• Health Insurance, Death & Disability Insurance
• Access to the SumUp Sabbatical, our Employee assistance program for mental health as well as Fitness and Transport allowance and language learning benefits.
• You’ll attend global offsites and/or hackathons.

Compensation: For entry senior level 5250 - 7500 Euro Gross / month + 2000 EUR annual learning budget + Virtual Stock Options. Ranges may vary based on skills and experience.

About SumUp

At SumUp, we’re on a mission to empower small businesses around the world with simple, affordable tools to help them start, run, and grow. More than 4 million merchants across 36 markets trust us as their financial partner — and we’re just getting started.

We’re a global team of 3,000+ people from over 90 nationalities, united by curiosity, collaboration, and care. Our core values and culture shape everything we do, fostering inclusion, learning, and belonging.

SumUp is proud to be an Equal Employment Opportunity employer, committed to building a safe, respectful, and diverse workplace where everyone can thrive.

👉 Explore more about our culture on our careers site, or follow us on LinkedIn and Instagram.

SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited.