Backend Engineer - POS

<p>SumUp's <strong>Point-of-Sale (POS)</strong> 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.</p> <p>As a Backend Engineer in the <strong>Orders &amp; Sales </strong>or <strong>Catalog Platform</strong> 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.</p> <p>The Orders &amp; 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.</p> <h3><strong>What you'll do</strong></h3> <ul> <li>Develop and evolve high-performance backend services and APIs using <strong>Kotlin</strong> and <strong>Spring Boot</strong>.</li> <li>Design and maintain robust data schemas and event-driven integrations (Kafka) to handle complex transaction and catalog data at scale.</li> <li>Write clean, well-tested, production-grade code and contribute meaningfully to code reviews and team rituals.</li> <li>Collaborate with mobile and product teams to ship