iOS Engineer - Design System

SumUp; Berlin; On-site; EUR 60,000 - 80,000; Full time

Benefits offered by this job

Corporate pension scheme

28 days paid leave

Free German classes

Subsidised Urban Sports Club membership

Budget for conferences and training

Job summary

A leading fintech company in Berlin is seeking an experienced iOS Engineer to enhance its design system. You will translate design language into reusable UI components while collaborating closely with product and design teams. Ideal candidates have over 3 years of iOS development experience, proficiency in Swift and Objective-C, and a passion for accessible user experiences. This role offers career development opportunities in a diverse global team and competitive benefits.

Qualifications

• 3+ years of professional experience in iOS development.
• Fluency in Swift and Objective-C.
• Deep knowledge of SwiftUI and UIKit.
• Strong grasp of testing best practices.
• Self-motivated with excellent English communication.

Responsibilities

• Shape user and developer experiences in iOS ecosystem.
• Build maintainable and beautiful UI components.
• Embed accessibility best practices in components.
• Provide technical support to product teams.
• Review code contributions and guide engineers.
• Migrate legacy UIKit components to SwiftUI.
• Address tech debt to maintain codebase health.

Skills

Swift

Objective-C

SwiftUI

UIKit

Accessibility best practices

Testing best practices

English communication

Job description

As an iOS Engineer in the Design System team, you will translate SumUp’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 SumUp’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.

What You’ll Do

• Shape the core experience of users and developers interacting with SumUp’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’ll be great for this role if

• 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.

Why you should join SumUp

• 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.

About SumUp

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.

SumUp is an Equal Employment Opportunity employer that proudly pursues and hires a diverse workforce. SumUp 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. SumUp also strives for a healthy and safe workplace and strictly prohibits harassment of any kind.

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

Job Application Tip

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 SumUp.