Senior Backend Engineer - Transfers Gateway

At SumUp, the Global Bank tribe builds the core infrastructure and services that give merchants a digital business account, helping millions of 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.

The Vilnius team is a core part of the Global Bank domain. We own production systems, shape technical direction, and work closely with colleagues across SumUp’s global offices on critical merchant banking capabilities. Join our Vilnius Team today (Vilnius office).

What You’ll Do

Own high availability money movement production services end‑to‑end, including delivery, observability, maintenance, and operational support.

Lead small‑to‑mid sized initiatives and take responsibility for significant parts of larger team’s domain projects.

Lead architectural and design decisions, including system design, data modelling, and API boundaries.

Improve service reliability and quality through testing, monitoring, alerting, and continuous improvement of delivery p