(Senior) Backend Engineer

At SumUp , we believe small merchants are the heartbeat of our communities. By joining the Payments BR Tribe , you'll help shape solutions that directly solve merchants' everyday challenges and redefine how financial products empower entrepreneurship in Brazil. The tribe is deeply focused on the Brazilian market — understanding the real needs and behaviours of our merchants and building products that truly fit their world. You'll be part of a global, autonomous, cross-functional team of driven, purpose-led people who take ownership, embrace challenges, and care deeply about helping businesses succeed. As a (Senior) Backend Engineer , you'll be the technical anchor of a small, high-impact squad — bringing clarity to complex integration logic, setting the architectural direction, and helping a growing engineer reach their potential. This is a role for someone who finds satisfaction in making hard systems reliable, loves writing clean Go code, and isn't afraid to navigate the complexity that comes with building at scale in a fast-growing market. What you'll do Own the architecture: Design and author RFCs that shape how the domain evolves, driving clean, scalable solutions across our integration layer with internal SumUp services and third-party services as well. Write and review high-quality code: Take full ownership of backend delivery — from writing production-grade code to leading rigorous peer reviews that keep the codebase healthy and maintainable Drive technical standards: Establish clear documentation, testing practices, and CI/CD improvements that reduce technical debt and make the squad more autonomous over time Mentor and grow the team: Pair-program with and actively develop other engineers on the squad, acting as the technical reference point and fostering a culture of ownership and engineering excellence Collaborate broadly: Partner closely with the Engineering Manager, Product Manager, and cross-functional stakeholders to translate business needs into clea