About the Role
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.
Responsibilities
•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
Requirements
•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
Conditions & Benefits
•Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from the Berlin office. This involves an office-first setup
•Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced
•Enrolment onto the Virtual Stock Option programme: you will own a stake in SumUp's future success
•A dedicated annual L&D budget of €2000 for individual development, which can be used to attend conferences and/or advancing your career through further education
•A corporate pension scheme where the company matches up to 20% of contributions
•Generous time off: 28 days of paid leave plus public holidays and special leave days
•Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, subsidised office lunches
•Break4me: 1-month sabbatical after 3 years of service
•Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team
