Senior IOS Engineer - SuperApp

The Engagement Mission sits within the Super App & Web squad — a cross-functional team of engineers, product managers, and designers building the core experience that millions of merchants interact with every day.

This team owns the home screen of the Sum Up Business App: the first thing a merchant sees when they open the app, and the surface that connects them to payments, banking, invoicing, loyalty, and more. We're growing the team because the roadmap is ambitious — new navigation patterns, deeper product integrations, and a full modularisation of the codebase — and we need someone who can hit the ground running and take real ownership from day one.

• Build and maintain core iOS features across the home screen, including first‑time user experience, quick actions, widgets, the tools section, and upsell and cross‑sell channels
• Lead the development of new initiatives end‑to‑end — from technical design through to shipping — working closely with product, design, and partner engineering teams
• Drive the migration to SwiftUI and contribute to the modularisation of our codebase, improving scalability and developer experience
• Review code, shape technical decisions, and help raise the bar across the iOS chapter
• Collaborate with multiple internal teams to align on feature direction, open pull requests, and deliver in a fast‑moving, loosely defined environment

• Strong proficiency in Swift and SwiftUI, with a track record of building and shipping production iOS features at scale
• Experience navigating and refactoring complex, evolving codebases with a focus on clean architecture (MVVM/MVP)
• Comfortable working in a cross‑functional environment where scope isn't always well‑defined and priorities shift quickly
• Ability to take full ownership of initiatives independently — from technical scoping through to delivery — without needing close guidance
• Experience collaborating across teams where you don't own the product roadmap directly, and are used to aligning with multiple stakeholders to get things shipped
• Strong technical writing skills and a habit of writing clear documentation and thoughtful pull requests

• 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 use to attend conferences and/or advance 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

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.