SumUp enables businesses to get paid easily, process orders quickly, sell online instantly and manage their money more efficiently. We create the tools businesses need to make their business and their customer experience thrive.
The payments processing platform, consisting of other sub-platforms, has powered SumUp’s global business for more than 10 years now. It’s developed in Sofia by the Payments Tribe, composed of several teams (squads). Each squad is cross-functional, autonomous and co-located, working on its part of the platform end-to-end.
We are scaling and improving existing products, while developing new ones - an exciting time to join. You would make an impact by improving and co-creating our existing and new microservices architecture platforms, solving scaling and new development challenges. Scalability and high availability are among our focus areas.
What you’ll do
Design and evolve systems that process millions of transactions reliably and at scale
Build and maintain backend services in a microservices architecture
Contribute to API design for internal services and external integrations
Write clean, maintainable, and scalable code with strong test coverage
Participate in architectural discussions and drive technical decisions
Collaborate closely with engineers, QA, and DevOps to deliver production-ready systems
Continuously improve engineering practices, including leveraging AI to iterate faster
Strong programming experience in any modern language (e.g. Go, Java, Python, Kotlin, etc.). We care more about how you think and design systems than the specific language you use
Solid understanding of system design, scalability, and distributed systems
Experience building APIs and working with data storage systems
Ability to learn new technologies quickly and pragmatically
Strong problem-solving skills and a structured way of thinking
Ownership mindset and collaborative approach to teamwork
Inte
Neutral 2–4 sentence summary of what working at this company is like, drawn from public reviews and press coverage. Tone, collaboration style, pace, benefits highlights.
£45,000 – £60,000 (Glassdoor, Levels.fyi, 2025)
