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.

• Opportunity to work with Sum Uppers globally on large‑scale fintech products used by millions of businesses worldwide, from our 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 our Virtual Stock Option programme: you will own a stake in Sum Up's future success
• A dedicated annual L&D budget of €2000 for your individual development, which you can be used to attend conferences and/or advancing your career through further education
• A corporate pension scheme where we match up to 20% of your contributions
• Generous time off: enjoy 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 Sum Up team

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.