Senior Software Engineer

SumUp·Florianópolis, Santa Catarina, Brazil; São Paulo, São Paulo, Brazil·Posted 21 October 2026

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About the role

At SumUp , we believe small merchants are the heartbeat of our communities. By joining the Lending team , you'll help keep a core credit product running for businesses across Europe and Brazil, one that's already proven, already trusted, and still has plenty of room to get better. As a Senior Backend Engineer , you'll be a technical anchor on the Servicing squad, operating with real autonomy to challenge existing patterns rather than just maintain them. This is a role for someone who's energised by complex, live systems, comfortable owning hard trade offs between speed and stability, and excited to help scale a regulated, high stakes platform without breaking what already works. What you'll do Build and maintain backend services that power SumUp's lending platform in Go Strengthen observability and monitoring so the team can measure system health and catch issues before they become incidents Write integration tests that protect the reliability of every release Help adapt the platform to new regulatory requirements as SumUp expands into new markets Contribute to exploring and implementing new loan repayment flows Investigate production incidents and balance fast fixes with long…

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