Senior Full-Stack Engineer - SuperApp

What you'll do

• Own and develop core web dashboard features including the first-time user experience, home screen widgets, quick actions, tools section, and communications centre

• Build and maintain the backend services that power these flows, ensuring a seamless and consistent experience across web and mobile

• Work closely with iOS and Android engineers, product managers, and designers to shape cross-platform solutions and contribute to technical direction

• Lead the design and refinement of technical solutions — writing clear documentation, making architectural decisions, and communicating progress to stakeholders

• Be an active contributor to the web chapter and the broader engineering community at SumUp

You'll be great for this role if…

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

• Comfortable working across the stack, with experience building backend services or REST APIs, Go is a plus, but Node.js or similar is equally welcome.

• Ability to navigate and refactor complex codebases with a focus on clean, durable code and solid system design.

• Experience working in cross-functional teams alongside product managers and designers, with a strong sense of ownership and comfort with ambiguity.

• A product mindset, thinking about the merchant experience, not just the code, and connecting technical decisions to real business outcomes.