Backend Engineer - POS

SumUp’s Point-of-Sale (POS) solution empowers cafes, shops, bars, hair salons, and other businesses to operate efficiently and grow. It offers a wide range of features, including product catalogs, inventory management, business analytics, compliance support, and loyalty tools.

As a Backend Engineer in the Orders & Sales or Catalog Platform team, you will build the engine powering core infrastructure for over 4 million businesses worldwide. Whether you are architecting global sales APIs or scaling item management systems, your work is central to the SumUp ecosystem.

The Orders & Sales team builds high-performance APIs and receipt engines that unify transaction and sales data, utilizing an AI-native mindset and extreme collaboration. Meanwhile, the Catalog Platform team owns the backend for item management, variants, categories, and taxes, focusing on high-stakes reliability and core POS infrastructure scaling.

What you’ll do

Develop and evolve high-performance backend services and APIs using Kotlin and Spring Boot.

Design and maintain robust data schemas and event-driven integrations (Kafka) to handle complex transaction and catalog data at scale.

Write clean, well-tested, production-grade code and contribute meaningfully to code reviews and team rituals.

Collaborate with mobile and product teams to ship end-to-end features with a focus on performance and data consistency.

Engage in daily pair programming to solve complex concurrency challenges and maintain high architectural standards.

Take full ownership of the development lifecycle, including managing CI/CD pipelines and monitoring service health in production.

Actively use and experiment with AI coding agents to automate repetitive tasks and increase shipping velocity.

Refactor and migrate mission-critical domain logic to centralize and simplify the "Sales" and "Catalog" experiences across the ecosystem.

You’ll be great for this role if

You have 3+ years of experience in backend engineering with the