Senior Backend Engineer is open at SumUp in Warsaw, Poland; Warszawa, Masovian Voivodeship, Poland. Posted on May 13, 2026, and still on SumUp’s careers page when we last checked, on Nov 14, 2026.
About the role
Design, build, and maintain scalable backend systems supporting SumUp’s Bookings product Collaborate with frontend and mobile engineers to deliver new features and improve APIs across web, iOS, and Android Participate in technical planning, code reviews, and design discussions to ensure clean, testable, and maintainable code Continuously optimise performance , ensure observability, and uphold our high reliability…
The opening lines of the posting. The rest is on SumUp’s careers page.
Hiring at SumUp
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