Senior Backend Engineer (Java) - Payments Tribe

Senior backend engineer Java – Payments tribe

📍 Sofia | Full-time | Office-first

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WHO WE ARE

We’ve come a long way from our origins as a small startup. Today, we’re a truly global fintech company, with over 3000+ people from 80 nationalities, spread across 22 offices on 4 continents. And we’re growing and diversifying faster than ever before.

SumUp enables businesses to get paid easily, process orders quickly, sell online instantly and manage their money more efficiently. We create the tools businesses need to make their business and their customer experience thrive.

The Team

The Settlement Squad sits within SumUp's Payments Tribe and is responsible for the infrastructure that moves real money — managing settlement processes, banking integrations, and the financial controls that keep payouts running accurately across our merchant base. We're at a pivotal moment: alongside maintaining a business-critical legacy system, we're building a brand-new event-driven platform designed to scale across multiple markets and teams. This role is central to that transition — you'll help shape the architecture of a system where the quality of your decisions has a direct, measurable impact on SumUp's operations and reputation.

What you'll do

Build and maintain integrations with banking partners that execute payouts to merchant bank accounts

Contribute to the design and development of a new event-driven microservices platform, moving away from legacy architecture

Work on reconciliation processes, prefunding calculations, and safeguarding flows for our payment operations teams

Develop and maintain operational tooling used by Payment Operations to manage day-to-day payout jobs

Participate in code reviews, architectural discussions, and on-call rotations to keep our systems healthy and reliable

You'll be great for this role if you have

Strong hands-on experience with Java and Spring Boot, building and maintaining production-grade backend servic