Senior Fullstack TypeScript Developer

The Sidekick team builds and owns the progressive web app that SumUps field sales agents rely on every day, a tool that brings together everything a seller needs in one place: creating offers on the go, signing up new merchants, managing hardware sales, and tracking commissions in real time. It's one of our most impactful internal products, sitting at the heart of a primary revenue driver for the business.

As our Senior Full Stack Engineer, you'll take genuine ownership of features end-to-end, from scoping through to production, working closely with product, engaging directly with sales stakeholders, and having a real say in what gets built and why. Build and maintain features across the full stack of our progressive web app, spanning the field sales experience, back office tooling for sales agents, and emerging LLM-powered support tooling, owning work from scoping through to production

Participate actively in product discovery, joining user research sessions, reviewing usage data, and contributing to prioritisation discussions alongside product

Integrate with external systems such as Salesforce where required, and help shape how data flows across domains to create a consistent experience for field sellers

Strong, proven experience with React and TypeScript, building scalable, maintainable applications in a production environment.

Hands-on experience with a full-stack framework, Next.Comfortable showcasing and demoing work, and always looking for ways to simplify or automate where it makes sense.

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 €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

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. Discover more about our culture and opportunities on our careers website , and follow our journey on LinkedIn , Instagram , and TikTok

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.

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.