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About the team You'll join the Sell Online Tribe, the group shaping how merchants bring their businesses to life online. We design and build tools that help millions of entrepreneurs, from barbers to bakers, sell their products and services anywhere. You'll be working on some of SumUp's biggest merchant-facing online products as part of the Bifrost team, contributing to growing and scaling critical products like Payment Links and Gift Cards, while also working on integration products that provide essential features used across many other SumUp products. They're high-traffic, high-responsibility products that other SumUp teams depend on too. You'll join a small, cross-functional team and take on genuine ownership of the frontend - not just executing tickets, but shaping how the products evolve. With new features to ship and integration products to keep secure and current, there's real, meaningful work to get stuck into from day one. js applications (including SSR and app router patterns) You have experience writing unit, integration, and end-to-end tests using tools like Jest, Vitest, or React Testing Library You're comfortable working within CI/CD workflows and collaborating in agile environments (Scrum or Kanban) You have experience with UI libraries such as Radix or shadcn, and a solid understanding of accessibility and UX best practices You have a product mindset - someone who cares about the value delivered to merchants, not just the code written to get there, and who can work autonomously to drive complex features end-to-end Why you should join SumUp 🌎 Opportunity to work in a truly global, multicultural team from our open, vibrant Cologne office, located in the heart of the city. Benefits platform 🌴 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 matters. At SumUp, we're 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, fin

Senior Frontend Engineer – Sell Online

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