Senior iOS Engineer - POS Tribe

About the Team:

SumUp’s Point-of-Sale (POS) solution empowers cafes, shops, bars, hair salons, and other businesses to operate efficiently and grow by offering a comprehensive range of features, including product catalogs, inventory management, business analytics, compliance support, and loyalty tools. Seamlessly integrated into the SumUp SuperApp, our POS system supports both proprietary register hardware and mobile devices such as tablets and smartphones, ensuring flexibility and ease of use for businesses of all sizes.

As a Senior iOS Developer, you’ll be part of a dynamic, cross-functional team, working closely with Product Managers, Product Designers, Engineering Managers, and fellow engineers to drive innovation within the Fisc and staff squad. Collaboration is at the heart of what we do, and in this role, your contributions will help shape the future of our mobile solutions. We value user-centric design, structured communication, and technical precision, all of which are essential in our highly collaborative environment.

Based in Berlin, this on-site role fosters face-to-face interactions that enhance teamwork and spark innovation. As we evolve toward a Kotlin Multiplatform (KMP) strategy to enable shared development across Android and iOS, you’ll have the opportunity to learn, refine, and implement cutting-edge technology, contributing to the next generation of our mobile applications.

What you’ll do:

• Drive impactful initiatives that bring value to merchants worldwide
• Build and maintain cashbook and staff related features using a combination of Kotlin Multiplatform and SwiftUI.
• Implement fiscal compliance for point-of-sale systems across all SumUp operating countries
• Collaborate closely with Designers, Product Managers, and Android engineers to create a seamless and unified user experience across platforms.
• Contribute to the product’s evolution by identifying opportunities for improvement and playing an active role in daily decision-making.
• Enhance and maintain our unified iOS app, distributed across 60+ countries, ensuring high-quality, scalable solutions.
• Write thorough documentation and implement robust testing to uphold quality standards before shipping.

You’ll be a great fit for this role if you have:

• 5+ years of experience in mobile engineering with iOS/Swift and at least 2 years of hands-on experience with SwiftUI.
• A strong understanding of software design patterns such as MVVM or MVP, with expertise in building scalable and modular app architectures.
• Solid knowledge of testing best practices, understanding what to test, why it matters, and how to write resilient tests.
• A passion for writing clean, maintainable code while balancing pragmatism and perfection.
• A keen interest in multi-platform development using Kotlin Multiplatform, with a curiosity to learn and contribute in this area.

Why you should join SumUp:

🌍 Opportunity to work with SumUppers 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

📚 A dedicated annual L&D budget of €2,000 for attending conferences and/or advancing your career through further education.

🚀 Enrolment onto our VSOP program: You will own a stake in SumUp’s future success

💶 A corporate pension scheme where we match up to 20% of your contributions

🔄 30 Days Sabbatical: Enjoy the unique opportunity to take a well-deserved break with our 30 days sabbatical benefit after completing 3 years of employment with SumUp.

🔗 Referral Bonus: Earn additional rewards by referring talented individuals to join the SumUp team.

🚵🏾‍♂️ Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, relocation assistance, subsidised office lunches.

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.

About us:

SumUp is a leading financial technology company, founded in 2012 with the goal of empowering small businesses around the globe. We’re the financial partner of choice for more than 4 million merchants in over 35 markets. We collectively build, plan and fine-tune the technology that drives SumUp and empowers small businesses around the world.

We believe in the everyday hero. Those who have the courage to follow their passion and who have the strength and determination to realise their dreams. Small business owners are at the heart of all we do, so we're creating powerful, easy-to-use financial solutions to help them run their business. With a founders mentality and a 'team-first attitude' our diverse teams across Europe, South America, and the United States work together to ensure that small business owners can be successful doing what they love.