iOS Engineer - Design System

About the role

About the team:

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.

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.

What you’ll do:

- Shape the core experience for both users and developers interacting with SumUp's iOS ecosystem

- Collaborate closely with product and design teams to build components that are maintainable, consistent, and beautiful

- Embed accessibility best practices into every component — from content descriptions and touch target sizing to color contrast and dynamic type

- Provide hands-on technical guidance to product teams to deliver on company priorities, including the upcoming support for landscape orientation

- Review code contributions, enforce design system conventions, and mentor engineers on best practices for reusable UI development

- Lead the migration of legacy UIKit-based components to SwiftUI while maintaining system stability

- Proactively identify and address technical debt to uphold a high bar for engineering excellence and codebase health

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

- Bring 3+ years of professional iOS development experience, ideally on large-scale or consumer-facing applications

- 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

- 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

- 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

- Bring a strong grasp of testing best practices for UI components, including unit tests, snapshot tests, and UI automation

- Are comfortable reviewing code and mentoring peers — you enjoy sharing knowledge, giving constructive feedback, and raising the bar for the whole team

- Are self-motivated and structured in your working style — you manage your own priorities, communicate clearly in English, and thrive in a cross-functional, collaborative environment

- Stay genuinely curious about the iOS ecosystem — you follow Apple's releases closely, experiment with new APIs, and are excited to bring fresh ideas back to the team