iOS Engineer - Mobile Platform

SumUp; Köln; Vor Ort; EUR 70.000 - 110.000; Vollzeit

Benefits dieser Stelle

Hack Days

Hack Weeks

VSOP program

Corporate pension

30 Days Sabbatical

Relocation assistance

Urban Sports Club subsidy

Zusammenfassung

SumUp's Mobile Platform Squad in Köln is hiring an experienced iOS engineer to build and maintain internal tools, frameworks, and infrastructure that power fast, reliable app delivery.

You will collaborate with mobile engineers across squads, own end-to-end platform initiatives, and contribute to CI/CD and tooling improvements in a mature codebase. A strong focus on simplicity and maintainability drives your work.

Qualifikationen

• 3+ years of professional iOS development experience with Swift.
• Experience with CI/CD pipelines and developer tooling.
• Solid understanding of testing methodologies, architecture patterns, and design principles.

Aufgaben

• Develop and maintain internal tools, frameworks, and infrastructure that support the iOS app.
• Contribute to CI/CD systems and developer tooling initiatives.
• Tackle technical debt and improve codebase health in a mature codebase.
• Collaborate with mobile engineers across squads and act as a platform expert.
• Take end-to-end ownership of well-scoped platform initiatives from design to delivery.

Kenntnisse

Swift

CI/CD pipelines

Testing methodologies

Architectural patterns

Cross-team collaboration

Tools

GitHub Actions

Fastlane

Ruby scripting

Jobbeschreibung

About the team:

The Mobile Platform Squad is the backbone of SumUp's iOS engineering — we build and maintain the foundation that every iOS feature team relies on to ship fast, confidently, and at scale.

About the team:

The Mobile Platform Squad is the backbone of SumUp's iOS engineering — we build and maintain the foundation that every iOS feature team relies on to ship fast, confidently, and at scale.

We're a small, high-impact team that sits at the intersection of infrastructure, developer experience, and engineering excellence. Our work isn't visible to merchants directly, but it's felt by every iOS engineer at SumUp every single day — through faster build times, smoother CI/CD pipelines, healthier codebases, and better tooling.

With significant investment in SumUp's mobile products, we're on a mission to empower feature teams to deliver world-class experiences without being slowed down by platform friction. That means building robust internal frameworks, evolving a mature and complex codebase, and acting as a trusted partner to mobile engineers across the organization.

Our engineering culture is built on autonomy, collaboration, and craft. We move with purpose, share knowledge openly, and believe that great platform work is what makes great product work possible. If you're someone who finds deep satisfaction in enabling others to do their best work — you'll feel right at home here.

What you'll do:

• Develop and maintain internal tools, frameworks, and infrastructure that support the consistency, scalability, and long-term health of SumUp's iOS app
• Contribute to CI/CD systems and developer tooling initiatives that help feature teams ship with speed and confidence
• Tackle technical debt and codebase health improvements in a complex, mature codebase — with a focus on simplicity and maintainability
• Collaborate closely with mobile engineers across squads, acting as a go-to partner for platform questions, reviews, and best practices
• Take end-to-end ownership of well-scoped platform initiatives — from design and implementation through to delivery and documentation

You will be a great fit for this role if you:

• Bring 3+ years of professional iOS development experience, with solid hands-on knowledge of Swift and modern iOS frameworks
• Are experienced with or genuinely excited about CI/CD pipelines (e.g., GitHub Actions, Fastlane) and developer tooling — you see automation as a superpower
• Have a solid understanding of testing methodologies, architecture patterns, and design principles, and apply them with pragmatism
• Are comfortable working outside the boundaries of a typical feature team — you're adaptable, self-directed, and thrive with a mix of structured and ambiguous work
• Can navigate and improve complex, mature codebases with patience, curiosity, and a long-term mindset
• Communicate and collaborate clearly across teams — you're comfortable with frequent context switching and know how to bring clarity to technical discussions

Nice to have:

• Experience with modularized codebases, internal tooling, or Ruby scripting

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

We take learning and experimentation seriously with Hack Days every second Friday, and entire global Hack Weeks.

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.

SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on 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. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited.

About us:

Be empowered to do more that matters.

At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 36 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships.

Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify.

Explore career opportunities with us and join a team driven by collaboration, innovation, and a shared vision of creating a world where everyone can build a thriving business. Discover more about our vibrant and inclusive work culture and how we work on our careers website, and follow our journey on LinkedIn and Instagram.

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.