Senior Android Engineer - KMP

<p><strong>About the team</strong></p> <p>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.</p> <p>Our POS solution integrates seamlessly into the SumUp SuperApp, which supports both our proprietary register hardware and mobile devices like tablets and phones.</p> <p>As a <strong>Senior Android Developer</strong>, you’ll collaborate with a dynamic, cross-functional team of Product Managers, Product Designers, Engineering Managers, and fellow engineers.</p> <p><strong>About the role</strong></p> <p>We’re evolving toward a Kotlin Multiplatform (KMP) strategy, enabling shared development across Android and iOS. In this role, you’ll learn, refine, and help implement this technology, shaping the future of our mobile apps.</p> <p>You’re a developer who values user-centric design, precision, and seamless collaboration. You bring structure to communication and thrive in a cross-functional environment. </p> <p>This role is on-site in Berlin, where face-to-face interactions spark innovation and teamwork.</p> <p><strong>What you’ll do</strong></p> <ul> <li>Build new features for the item catalog within the SumUp SuperApp</li> <li>Help improve the architecture of the application and contribute to our Kotlin Multiplatform strategy</li> <li>Enhance and maintain our unified android app, distributed across 60+ countries, ensuring high-quality, scalable solutions</li> <li>Shape the product’s evolution by identifying opportunities for improvement and contributing to daily decision-making</li> <li>Write thorough documentation and implement robust testing for features before shipping</li> <li>Collaborate closely with Designer, Product Manager and Android engineers to deliver a unified UX experience across platforms</li> <li>Coach and mentor other engineers</li> </ul> <p><strong>You’ll thrive in this role if:</strong></p> <ul> <li>You have <strong>8</strong><strong>+ years experience </strong>in mobile engineering with <strong>Android and Kotlin.</strong></li> <li>You have <strong>2+ years of experience</strong> working with <strong>Jetpack Compose.</strong></li> <li>You have a <strong>solid understanding of software design patterns</strong> (e.g., MVVM, MVI) and expertise in building modular, scalable app architectures.</li> <li>You have<strong> good knowledge of reactive programming </strong>(Flow, Coroutines and Concurrency).</li> <li>You have a <strong>strong grasp of testing </strong>best practices: knowing what to test, why, and how to write resilient tests.</li> <li>You <strong>strive for clean code,</strong> and you are flexible to <strong>balance pragmatism and perfection.</strong></li> <li>