Senior Fullstack TypeScript Developer

The team operates within the Acquisition Tribe, focusing on developing end-to-end platforms and tools used by Sales, Partner Acquisition, and Account Management teams on a daily basis.
You will contribute across the stack—designing and building backend services, APIs, and frontend applications that support acquisition workflows such as lead management, partner integrations, and onboarding processes. From a technical perspective, the team works with microservices architecture, event-driven systems, and modern frontend frameworks, handling high volumes of operational data and enabling real-time interactions across systems. You'll collaborate closely with Product, Data, and other engineering teams to define scalable system designs, clean interfaces, and strong data contracts, while continuously improving system reliability, performance, and developer experience across the stack.

Design, build, and maintain end-to-end features across backend services and frontend applications that support merchant acquisition and onboarding workflows
Build intuitive frontend interfaces that simplify complex operational processes and improve internal user experience
Ensure data consistency and reliability across systems that handle leads, partner integrations, and acquisition pipelines
Collaborate closely with Product, Data, and cross-functional teams to translate business needs into scalable, user-centric solutions

5+ years of professional experience, with strong proficiency in TypeScript and React

• Hands-on experience building fullstack applications using modern frameworks such as Next.Strong experience designing and consuming RESTful APIs within a microservices environment, ideally supporting data-heavy or workflow-driven systems
• Experience working with SQL and event-driven architectures (e.g. Postgres, Kafka), especially in systems that handle operational data such as leads, onboarding flows, or partner integrations
• Good understanding of system architecture, software design principles, data modeling, and API design, with the ability to build scalable and maintainable systems
• Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. A dedicated annual L&D budget of €2,000 for attending conferences and/or advancing your career through further education

A corporate pension scheme where we match up to 20% of your contributions
30 Days Sabbatical: Enjoy the unique opportunity to take a well-deserved break with our 30 days sabbatical benefit after completing 3 years of employment with SumUp
Referral Bonus: Earn additional rewards by referring talented individuals to join the SumUp team
‍♂️ Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, relocation assistance, subsidised office lunches
Today, over 4 million businesses in 36 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 differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify.
Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited.
Explore career opportunities with us and join a team driven by collaboration, innovation, and a shared vision of creating a world where everyone can build a thriving business. Discover more about our vibrant and inclusive work culture and how we work on our careers website , and follow our journey on LinkedIn and Instagram .
If you don't tick every box, it's ok too because it means you have room to learn and develop your career at SumUp.