iOS Engineer - Design System

<p><strong>About the team:</strong></p> <p data-pm-slice="1 1 []">As an iOS Engineer on the Design System team, you'll translate SumUp's design language into a reusable, easy-to-use library of UI components and experience patterns — empowering product teams to build cohesive, accessible user experiences at scale.</p> <p>The Design System team works hand-in-hand with the Mobile Platform team to set standards and provide guidance across all product teams at SumUp. As we expand our ecosystem of merchant and consumer-facing products, this role offers a rare opportunity to shape the foundation that helps developers build faster and ship higher-quality experiences to millions of users worldwide.</p> <p>&nbsp;</p> <p><strong>What you’ll do:</strong></p> <ul> <li>Shape the core experience for both users and developers interacting with SumUp's iOS ecosystem</li> <li>Collaborate closely with product and design teams to build components that are maintainable, consistent, and beautiful</li> <li>Embed accessibility best practices into every component — from content descriptions and touch target sizing to color contrast and dynamic type</li> <li>Provide hands-on technical guidance to product teams to deliver on company priorities, including the upcoming brand refresh</li> <li>Review code contributions, enforce design system conventions, and mentor engineers on best practices for reusable UI development</li> <li>Lead the migration of legacy UIKit-based components to SwiftUI while maintaining system stability</li> <li>Proactively identify and address technical debt to uphold a high bar for engineering excellence and codebase health</li> </ul> <p>&nbsp;</p> <p><strong>You’ll be a great fit for this role if you:</strong></p> <ul> <li>Bring 3+ years of professional iOS development experience, ideally on large-scale or consumer-facing applications</li> <li>Are fluent in Swift, with deep hands-on knowledge of both SwiftUI and UIKit — and a clear view on when and how to use each</li> <li>Bring experience building or contributing to a design system, component library, or shared UI framework, and understand what it takes to make components truly reusable and scalable</li> <li>Take pride in crafting accessible user experiences — you know your way around VoiceOver, dynamic type, color contrast, and touch target standards, and treat accessibility as a first-class concern, not an afterthought</li> <li>Bring a strong grasp of testing best practices for UI components, including unit tests, snapshot tests, and UI automation</li> <li>Are comfortable reviewing code and mentoring peers — you enjoy sharing knowledge, giving constructive feedback, and raising the bar fo