Full Stack Engineer

Our Purchase squad owns the end-to-end checkout and buying experience across SumUp's platforms, from self-service journeys to sales-assisted flows, covering everything from hardware and subscriptions to bundled offers and promotions. We're in an active phase of stabilising and scaling our commerce platform, reducing complexity, and building the foundations that allow us to move faster and serve merchants better across multiple markets. This is a backend-leaning full stack role where you'll work on real, impactful problems that sit right at the centre of how merchants discover, buy, and manage SumUp's products. What you'll do Build and maintain frontend and backend components that power our checkout and purchase flows across self-service and sales-assisted channels Contribute to core commerce capabilities including subscription promotions, bundled offers, and order lifecycle improvements Help improve platform reliability and reduce technical complexity, addressing recurring issues and supporting ongoing migrations Work closely with product managers, designers, and engineers to deliver scalable, high-quality features across multiple markets Improve merchant-facing experiences, including better visibility into orders, invoices, and tracking information You'll be great for this role if Solid experience building full stack applications, with a backend focus. Ideally comfortable with Node.js or Go, though we're open to other backend languages. Comfortable working with both relational and non-relational databases. Practical frontend experience working with React or Next.js, with the ability to write clean, typed code in TypeScript or JavaScript. Strong communication skills in English, both written and spoken, with the ability to give and receive clear, constructive feedback. A pragmatic approach to problem-solving — able to make sensible trade-offs, unblock yourself and others, and write clean, maintainable code. Why you should join SumUp 🌎 Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup 🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced 📚 A dedicated annual L&D budget of €2000 for your individual development, which can be used to attend conferences and/or advance your career through further education 💶 A corporate pension scheme where we match up to 20% of your contributions 🏖 Generous time off: enjoy 28 days of paid leave plus public holidays and special leave days 🏙 Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, subsidised office lunches 🌴 Break4me: 1-month sabbatical after 3 years of service 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team About SumUp Be empowered to do more that matt