Senior Backend Engineer

About the team

At SumUp, we're on a mission to bring merchants and consumers closer together and help local communities thrive. Within the Consumer Mission, we're building a rewarding banking experience that connects people to the small businesses they love while tackling some of the most technically demanding challenges in fintech: critical infrastructure migrations, smooth, uninterrupted payment experiences, seamless open banking integrations, and high‑availability banking systems that can’t afford to fail – all while enabling free transactions for our merchants.

This role sits at the heart of that work — you’ll take real ownership of backend services that are close to our consumers, directly shaping their everyday experience, with impact that’s visible and felt across the entire platform.

🎥 Take a look inside our London office

What you'll do

Build and maintain Backend services for Core neobanking features including bank transfers, open banking, savings accounts, and payment processing

Take end-to-end ownership of features and projects, covering scoping, design, development, testing, deployment, and maintenance, leveraging Go along with Docker and Kubernetes for container orchestration.

Take ownership of critical infrastructure migrations — including our banking core system transitions — without disrupting live customer experiences

Collaborate closely with cross-functional teams including product, design, data science, security, and operations) to understand requirements, provide technical insights, and contribute to architecture discussions that ship meaningful banking features end-to-end

Support fellow developers and actively help build a collaborative, innovative engineering culture

Shape technical architecture and lead code reviews, helping define and promote best practices in code quality, testing, automation, and security to raise the overall engineering bar.

Build and integrate tools and systems that improve operational efficiency and reliabilit