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Software Engineer (Java, Kotlin) - SumUp Digital Bank

Sofia · Engineering

As part of our vision to become a truly global tech company, we are building out local, autonomous, cross-functional teams that can take an aspect of our product and perfect it from concept to execution. 

In Payments Tribe our goal is to build a global financial ecosystem while turning transactions into interactions. We are passionate about our product and the vision of bringing new payment solutions to small merchants. 

Banking services is a new domain in our ever growing ecosystem. It extends our product portfolio allowing small and medium-sized businesses to operate end to end on a single platform.

As a Software Engineer, you will be part of the team which builds SumUp's own digital bank to make our customers more successful in what they like doing.


  • Design, implement, and iteratively improve back-end services

  • Maintain and evolve the core banking system

  • Participate in API design and implementation for both internal APIs and those exposed to our third-party integrators

  • Help your team to deliver business value by taking decisions related to back-end and actively participating in the product discussions

  • Provide comprehensive documentation, good test coverage, and improve code quality

  • Collaborate with other software developers, QA and DevOps engineers to ensure smooth deployment, continuous integration, and support for the software that we deliver

  • Actively participate in code reviews with other software engineers


  • You have previous experience as a back-end engineer 

  • You have relevant experience with JVM based programming languages

  • You have a good understanding of software architecture and application design

  • You have experience with distributed and fault tolerant systems

  • You are familiar with Spring or another web MVC framework

  • You have a passion for clean, maintainable and testable code

  • You value team over individuals and autonomy within your team

  • You are open-minded, transparent and a team player, transparent and enjoy working with the people around you

  • You are proactive and able to thrive in a fast-paced, dynamic environment


  • Are active in the Dev community, contribute to open source or have personal projects

  • Enjoy mentoring fellow engineers and love sharing knowledge

  • Have experience with Docker and/or Kubernetes

  • Feel comfortable with Unix/Linux environments

If you don’t meet the requirements 100%, we’d still love to hear from you.


  • Be part of a close, welcoming international community of more than 1400 people from over 52 nationalities. We get together regularly for brunches, cocktail nights, football, office parties

  • Budget for attending conferences and advancing your career. We encourage you to speak at conferences and give talks

  • Weekly Lunch & Learn session, where the local engineering team exchanges ideas over company-sponsored lunch

  • Semi-annual off-sites, where the tech teams from Berlin, Sofia, São Paulo and Cologne gather together. In the past, we've gone to Spain, Bulgaria, Greece and a castle in the countryside of Germany

  • Start with 25 days of paid holidays and adding 1 day every year

  • Wellness benefits: yoga classes, subsidized gym membership, football, running, and bouldering teams

  • All the startup swag you expect: kicker table, unlimited drinks & fruits


We believe in the everyday hero.

Small business owners are at the heart of all we do, so we're creating tools that help them run their business. With a founders mentality and a 'team-first attitude' our diverse teams across Europe, South America, and the United States work together to ensure that the small business owners we partner with can be successful in doing what they love.

SumUp is an Equal Employment Opportunity employer that proudly pursues and hires a diverse workforce. SumUp does not make hiring or employment decisions on the basis of race, color, 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. SumUp also strives for a healthy and safe workplace and strictly prohibits harassment of any kind.