Senior Backend Engineer (Golang) - Bank Balance

<p>At SumUp, the <strong>Global Bank team </strong>builds the core infrastructure and services that give merchants a digital bank account, helping small businesses manage their money easily and reliably. </p> <p>The <strong>Balance Management Squad</strong> sits at the core of the <strong>Global Bank </strong>Platform. Right now, our team is completing a major milestone: consolidating and modernizing our balance management system in Europe. The next big step is creating a global transaction history service; a single, shared platform used by all regions to give merchants consistent and transparent views of their financial activity.</p> <p>As a <strong>Senior</strong> <strong>Backend Engineer</strong>, you’ll help modernize existing systems while balancing innovation with stability, collaborate with teams across regions, and build reliable services that manage diverse markets with different regulations.</p> <p>If you enjoy solving complex problems on high-load systems, are curious about banking, and are looking for a team that tackles challenges head-on, we’d love to hear from you.</p> <p><strong>What You’ll Do</strong></p> <ul> <li>Build and evolve the SumUp’s core banking services that powers ledger operations and transactions, transforming our regional systems into a unified, scalable global platform.</li> <li>Tackle complex distributed systems challenges, ensuring resilient services that continue to perform under high transaction volumes.</li> <li>Support modernization initiatives by improving observability, adding test coverage, refactoring code for long-term maintainability, and gradually introducing new architectural patterns without disrupting live banking operations.</li> <li>Contribute to key architectural decisions - build ledger and transaction history systems from the ground up, ensuring a globally scalable banking solution for our clients.</li> <li>Collaborate with teams across Risk, Treasury, Finance, and Infrastructure to ensure smooth, compliant, and reliable global operations</li> <li>Take ownership from design to production, running the services you build, monitoring their performance, and continuously improving how we deliver high-quality software at scale.</li> </ul> <p><strong>You’ll be great for this role if</strong></p> <ul> <li>You have solid backend experience building reliable, high-volume services and you think carefully about system design, APIs, data modeling, and how services interact.</li> <li>You are <strong>proficient in Golang </strong>and comfortable learning and working with other languages as needed, e.g. Kotlin or Elixir.</li> <li>You write maintainable, well-tested code, follow CI/CD best practices, and take responsibility for the software you build from development to production.</li> <li>You’re comfortable building, deploying, and running services in cloud environments like AWS using Docker and Kubernetes.</li> <li class="li1">Are fluent in relational databases that perform well under load and maintain data consistency.</li> <li>You are a collaborator who enjoys working across regions, communicating clearly, exchanging feedback effectively, and making thoughtful technical decisions together.</li&