About the TeamSumUp’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.

Our POS solution integrates seamlessly into the SumUp SuperApp, which supports both our proprietary register hardware and mobile devices like tablets and phones.

As a Senior iOS Developer, you’ll collaborate with a dynamic, cross-functional team of Product Managers, Product Designers, Engineering Managers, and fellow engineers. You’ll contribute to the Reporting & Insight Platform value stream.

About the roleYou’re a developer who values user-centric design, precision, and seamless collaboration. You bring structure to communication and thrive in a cross-functional environment. This role is on-site in Paris, where face-to-face interactions spark innovation and teamwork.

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.

What You’ll Do

• Drive key initiatives delivering value to our merchants
• Build and maintain features for Reporting & Insight using a combination of Kotlin Multiplatform and SwiftUI
• Collaborate closely with Designer, Product Manager and Android engineers to deliver a unified UX experience across platforms
• Shape the product’s evolution by identifying opportunities for improvement and contributing to 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 for features before shipping

You’ll thrive in this role if:

• You have 5+ years experience in mobile engineering with iOS/Swift.
• You have 2+ years of experience working with swiftUI.
• You have a solid understanding of software design patterns (e.g., MVVM, MVP) and expertise in building modular, scalable app architectures.
• You have a strong grasp of testing best practices: knowing what to test, why, and how to write resilient tests.
• You strive for clean code, and you are flexible to balance pragmatism and perfection.
• You have a keen interest in multi-platform development using Kotlin Multiplatform.

Why you should join SumUp

• The opportunity to work on large scale fintech products used by millions of small businesses around the world
• A dedicated annual Learning & Development budget for attending conferences and/or advancing your career through further education
• Enrollment onto our virtual stock ownership program - you will own a stake in SumUp’s future success
• You’ll attend global offsites and/or hackathons.
• SumUp Sabbatical : 30 days leave after 3 years in the company

Job Application Tip

We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.