iOS Engineer - Design System

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 brand refresh

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 ex