Responsibilities
- Build and maintain frontend features for payment links, gift cards, and online checkout products.
- Develop and maintain integration products and SDKs used by internal teams and external partners.
- Participate in technical planning, design reviews, estimations, trade-off discussions, and sprint ceremonies.
- Reduce technical debt and improve application performance, observability, and accessibility.
- Monitor live services, respond to issues, and provide redundancy for customer support requests reaching the team.
Requirements
- 5+ years of experience with TypeScript and JavaScript.
- Hands-on experience building production-grade React and Next.js applications, including SSR and app router patterns.
- Experience writing unit, integration, and end-to-end tests with tools such as Jest, Vitest, or React Testing Library.
- Comfort working within CI/CD workflows and agile environments such as Scrum or Kanban.
- Experience with UI libraries such as Radix or shadcn and a solid understanding of accessibility and UX best practices.
- Product mindset, autonomy, and ability to drive complex features end to end.
Benefits
- Office-first work setup from SumUp’s Cologne office.
- Virtual Stock Option programme.
- €2000 annual learning and development budget.
- 28 days of paid leave plus public holidays and special leave days.
- Subsidised mobility options, including discounted transport tickets or bike leasing.
- Access to fitness via Urban Sports Club, mostly covered by SumUp.
- Corporate pension scheme with SumUp contributing an extra 20% on top of the employee contribution.
- Corporate Benefits employee discounts.
- One-month sabbatical after three years of service.
- Referral bonus programme.
- Inclusive, multicultural workplace with diversity and inclusion commitments.
Tech Stack
Categories
About SumUp
SumUp is a leading global fintech company committed to levelling the playing field for small businesses. Founded in 2012, we’re the trusted partner of over 4 million merchants in 37 markets, providing simple and affordable tools that help them manage payments, finance, and customer relationships. Our vision is a world where everyone can build a thriving business. Guided by this, we champion small business ownership by creating accessible solutions that empower entrepreneurs to grow and succeed. Our diverse team of over 3,000 SumUppers — representing more than 90 nationalities across 20 offices worldwide — is at the heart of our success. Beyond business, we donate 1% of the net revenue generated by Solo devices to environmental causes and support educational and entrepreneurial initiatives around the world. Recognised as a Top Global Employer for inclusion by the Stonewall Workplace Equality Index in 2022 and 2023, and awarded Fintech Diversity Initiative of the Year at the Irish National Fintech Awards in 2025, SumUp continues to build an inclusive, supportive, and purpose-driven workplace where everyone belongs.