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# iOS Engineer - Design System

- **Company:** SumUp
- **Location:** Berlin, Germany
- **Experience:** Experienced
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Unit Testing, Code Review, Microsoft UI Automation, Uikit, Mobile Os, Swiftui, Ios Frameworks, Technical Debt, Material UI
- **Published:** August 24, 2026
- **Apply:** https://www.adzuna.de/details/5696977220

## About the Role

* 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

## Description

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


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