About the Team:

SumUp’s Point-of-Sale (POS) solution empowers cafes, shops, bars, hair salons, and other businesses to operate efficiently and grow by offering a comprehensive range of features, including product catalogs, inventory management, business analytics, compliance support, and loyalty tools. Seamlessly integrated into the SumUp SuperApp, our POS system supports both proprietary register hardware and mobile devices such as tablets and smartphones, ensuring flexibility and ease of use for businesses of all sizes.

As a Senior iOS Developer, you’ll be part of a dynamic, cross-functional team, working closely with Product Managers, Product Designers, Engineering Managers, and fellow engineers to drive innovation within the Fisc and staff squad. Collaboration is at the heart of what we do, and in this role, your contributions will help shape the future of our mobile solutions. We value user-centric design, structured communication, and technical precision, all of which are essential in our highly collaborative environment.

Based in Berlin, this on-site role fosters face-to-face interactions that enhance teamwork and spark innovation. As we evolve toward a Kotlin Multiplatform (KMP) strategy to enable shared development across Android and iOS, you’ll have the opportunity to learn, refine, and implement cutting-edge technology, contributing to the next generation of our mobile applications.

 

What you’ll do:

Drive impactful initiatives that bring value to merchants worldwide Build and maintain cashbook and staff related features using a combination of Kotlin Multiplatform and SwiftUI. Implement fiscal compliance for point-of-sale systems across all SumUp operating countries Collaborate closely with Designers, Product Managers, and Android engineers to create a seamless and unified user experience across platforms. Contribute to the product’s evolution by identifying opportunities for improvement and playing an active role in daily decision-making. Enhance and maintain our unified iOS app, distributed across 60+ countries, ensuring high-quality, scalable solutions. Write thorough documentation and implement robust testing to uphold quality standards before shipping.

 

You’ll be a great fit for this role if you have:

5+ years of experience in mobile engineering with iOS/Swift and at least 2 years of hands-on experience with SwiftUI. A strong understanding of software design patterns such as MVVM or MVP, with expertise in building scalable and modular app architectures. Solid knowledge of testing best practices, understanding what to test, why it matters, and how to write resilient tests. A passion for writing clean, maintainable code while balancing pragmatism and perfection. A keen interest in multi-platform development using Kotlin Multiplatform, with a curiosity to learn and contribute in this area.

 

Why you should join SumUp: