IOS Engineer - Design System

As an iOS Engineer in the Design System team
, you will translate Sum Up’s design language into an easy-to-use, reusable library of user interface components and experience patterns, enabling product teams to build cohesive and accessible user experiences. The Design System team collaborates closely with the Mobile Platform team to provide guidance and set standards for all product teams across the company.

The Design System team is expanding to cover Sum Up’s growing ecosystem of merchant and consumer-facing products. This role offers a unique opportunity to optimize and expand a system that helps developers build features faster and deliver high-quality experiences to millions of users worldwide.

• Shape the core experience of users and developers interacting with Sum Up’s Android ecosystem.
• Work closely with the product and design team to build components that are maintainable, usable, beautiful and consistent.
• Embed accessibility best practices into every component (content descriptions, touch target size, color contrast, dynamic type).
• Provide hands‑on technical support to product teams to deliver company priorities, such as the upcoming brand refresh.
• Review code contributions, enforce design‑system conventions, and guide engineers on best practices for reusable UI development.
• Migrate legacy UIKit-based components to SwiftUI while maintaining system stability.
• Identify and address tech debt proactively to ensure a high bar for engineering excellence and codebase health.

• You have 3+ years of professional experience in iOS development.
• You are fluent in Swift and Objective‑C, with deep knowledge of both SwiftUI and UIKit.
• You take pride in crafting accessible user experiences and have a strong grasp of testing best practices.
• You have a self‑motivated, clearly structured working style and excellent English communication skills.
• You enjoy keeping up to date with advancements in the iOS ecosystem and are excited about sharing your knowledge with the iOS community.

• We’re a truly global team of 3000+ people from 92+ countries, spread across 4 continents.
• You'll have the opportunity to make an impact as we work in flat hierarchies.
• You'll attend global offsites and regular team events.
• You’ll receive a budget for attending conferences and external training.
• We offer a corporate pension scheme, 28 days’ paid leave, free German and yoga classes, subsidised Urban Sports Club membership and other great benefits.

We believe in the everyday hero. Small business owners are at the heart of all we do, so we're creating tools that help them run their businesses. With a founder’s mentality and a 'team-first’ attitude, our diverse teams across Europe, South America and the United States work together to ensure that the small business owners we partner with can be successful doing what they love.

Sum Up is an Equal Employment Opportunity employer that proudly pursues and hires a diverse workforce. Sum Up does not make hiring or employment decisions on the basis of race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy.

Sum Up also strives for a healthy and safe workplace and strictly prohibits harassment of any kind.

Sum Up will not accept unsolicited resumes from any source other than directly from a candidate.

We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at Sum Up.