iOS Engineer - Design System

As an iOS Engineer on SumUp’s Design System team, you translate the design language into a reusable UI component library to empower product teams at scale. You collaborate with product and design to deliver maintainable, accessible components, and guide developers across the iOS ecosystem. You will lead migrations from UIKit to SwiftUI and address technical debt, shaping a scalable, high-quality platform used by millions. This role blends hands-on engineering with mentorship in a cross-functional setting.

• Virtual Stock Option programme
• L&D budget for conferences and education
• Health & Life Insurance
• Corporate pension scheme
• Referral bonus
• 28 days of paid leave plus holidays and special leave days

• Shape the core iOS experience and ecosystem for users and developers
• Collaborate with product and design to build maintainable, consistent components
• Embed accessibility best practices into every component (contrast, dynamic type, touch targets)
• Provide hands-on technical guidance to product teams, including landscape orientation support
• Review contributions, enforce design system conventions, and mentor engineers
• Lead migration of legacy UIKit components to SwiftUI while preserving system stability
• Proactively identify and address technical debt to uphold engineering excellence

• 3+ years of professional iOS development experience
• Fluent in Swift with deep knowledge of SwiftUI and UIKit
• Experience building or contributing to a design system, component library, or shared UI framework
• Strong focus on accessibility (VoiceOver, color contrast, dynamic type)
• Solid testing practices for UI components (unit, snapshot, UI automation)
• Experience reviewing code and mentoring peers
• Self-motivated, structured work style and strong cross-functional collaboration
• Curiosity about the iOS ecosystem and Apple releases

• Mentoring and knowledge sharing
• Cross-functional collaboration
• Clear written and spoken communication in English
• Swift
• SwiftUI
• UIKit