Backend Engineer - Transfers Gateway

At SumUp, the Global Bank tribe builds the core infrastructure and services that give merchants a digital business account, helping small businesses manage their banking needs easily and reliably. The Transfers Gateway squad connects SumUp’s internal systems to external financial networks across the EU and the UK. We build and run the services that move money through payment schemes every day. The team owns end‑to‑end scheme integrations and operates production services that process real money at scale. You’ll help modernise existing systems while balancing reliability, correctness, and change, making architectural decisions that directly affect uptime and merchant experience across multiple markets. Our tech stack includes Go, AWS, Kafka, PostgreSQL, and Kubernetes, supported by a strong observability toolchain with Prometheus, Grafana, and Honeycomb. We also actively use AI‑assisted development tools such as Cursor, GitHub Copilot, and others. SumUp’s engineering culture is built around ownership. We follow a “build it, run it, improve it” model, with strong observability and a focus on learning. Engineers have clear scope and autonomy, with decisions documented, reviewed, and made collaboratively. What You’ll Do Build and maintain production money movement backend services, contributing to their delivery, observability, and ongoing maintenance. Own and deliver end to end features, and contribute to larger projects within the team’s domain. Contribute to technical design and implementation, following established architectural patterns and best practices. Improve service reliability and quality by writing tests, enhancing monitoring, and following established delivery pipelines. Support the operation of the systems you work on by participating in on‑call rotations, incident response, and learning from post‑incident reviews. Apply a backend and systems perspective during refinement, raising questions about risks, dependencies, and edge cases. Collaborate closely wit