Senior Frontend Engineer – Sell Online

SumUp · Cologne, North Rhine-Westphalia, Germanysenior

En corto

▸Constructor de herramientas online para emprendedores usando React y Next.js.
▸Trabajas en productos críticos con alta tráfico, como enlaces de pago y tarjetas regalo, con responsabilidad real.
▸Tienes autonomía total y participación en diseño técnico, despliegues y mantenimiento de productos.

Proficiency in English is required for collaboration across global teams.

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¿Qué piden?

✓5+ años con TypeScript y JavaScript
✓Experiencia comprobada en React y Next.js (SSR y app router)
✓Habilidades en pruebas unitarias, de integración y e2e con Jest/Vitest/RTL
✓Conocimiento de UI libraries como Radix o shadcn
✓Enfoque centrado en productos, no solo en código
✓Habilidades en CI/CD y entornos ágiles (Scrum o Kanban)

¿No cumplís todo? Es lo normal — tu dossier gratis te dice qué gaps tenés y cómo cubrirlos en la entrevista.

TypeScriptJavaScriptReactNext.jsSSRApp RouterJestVitestReact Testing LibraryRadix

¿A quién escribirle en SumUp?

Tu dossier gratis identifica a las personas que te entrevistarían — con su background, qué valoran y cómo escribirles para destacar antes de aplicar.

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

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