Full Stack Engineer (Backend Focus) - Billing & Subscriptions

About SumUp

SumUp's Billing and Subscriptions team is at the core of how merchants pay for, manage, and grow with our products. We own the billing engine, merchant wallet, and subscription experiences that support millions of transactions across 37 markets. We are currently in an exciting phase of rebuilding and expanding this foundation, deepening our billing capabilities to support new sales models, market expansions, and financial integrations that directly shape how small businesses experience SumUp.

What You'll Do

• Build and maintain backend services and frontend interfaces across our billing, contracts, and merchant wallet products.
• Contribute to the refactoring of key billing components to improve reliability, data security, and alignment with our wider payments platform.
• Support the expansion of our billing and wallet capabilities into new markets, ensuring localization requirements are met.
• Participate in our weekly support rotation, handling incoming customer queries and maintaining platform stability.
• Collaborate closely with senior engineers and product managers to deliver features end-to-end.

You'll Be Great for This Role If You Have

• Solid experience building full-stack applications, with a backend focus. Comfort with Node.js or Go is ideal, but we're open to other backend languages.
• Experience working with both relational databases (PostgreSQL, MySQL) and non-relational databases (DynamoDB, MongoDB, Redis).
• Practical frontend experience with React and Next.js, with the ability to write clean, typed code in TypeScript or JavaScript.
• Strong English communication skills (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

• Global Impact: 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.
• Diversity & Inclusion: Be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced.
• Learning & Development: A dedicated annual L&D budget of €2000 for individual development, usable for conferences and/or further education.
• Retirement Planning: 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.
• Additional Benefits: Urban Sports Club subsidy, Kita placement assistance, subsidized office lunches.
• Sabbatical: 1-month sabbatical after 3 years of service.
• Referral Bonus: Earn rewards by referring talented individuals.

About SumUp

At SumUp, we are on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 37 markets rely on SumUp as their financial partner to manage payments, finance, and customer relationships.

Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. 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.

Job Application Tip:

We recognize that candidates feel they need to meet 100% of the job criteria to apply. Please note that this is only a guide. If you don't tick every box, it's okay too because it means you have room to learn and develop your career at SumUp.