Senior IOS Engineer - SuperApp

About the team

The SuperApp & Web squad sits within the Engagement Mission under SumUp's Run & Grow tribe, and we're responsible for one of the most strategically important surfaces in SumUp's product ecosystem, the merchant app home screen. Our mission is simple but ambitious: make every SumUp merchant feel empowered, informed, and engaged every time they open the app. We own the home screen, tools section, and profile & settings across iOS, Android, and Web, and we build with four core objectives in mind:

• Activate merchants so they start using SumUp products as early as possible, through a first-class onboarding and first-time user experience
• Cross-sell & upsell SumUp products to the right merchants at the right time, via smart promotional components
• Surface insights that help merchants manage and grow their businesses through home screen widgets
• Enable navigation to the most relevant screens of the app.

The squad is cross-functional and collaborative, made up of iOS, Android, and full-stack engineers, a senior backend engineer, a senior product manager, a senior designer, and an engineering manager. You'll be paired with a senior Android engineer who will support your onboarding and growth, giving you the space to develop your skills while contributing meaningfully from day one.

What you’ll do

• Build and maintain features of the Android SuperApp home screen, including the first-time user experience, home screen widgets, quick actions, customization, tools section, profile & settings, and promotional channels, with guidance from your senior peers
• Contribute to the Personas initiative, helping build a tailored and customizable home screen experience that reduces friction and surfaces relevant data for each merchant
• Support codebase modularization and refactoring efforts, learning how to write scalable, maintainable code in a real-world production environment
• Participate in the definition and refinement of team initiatives, asking good questions, sharing ideas, and growing your technical judgment over time
• Take part in code reviews as both a contributor and a reviewer, building good habits around clean code and engineering best practices
• Write clear technical documentation and gradually build confidence communicating with stakeholders across product, design, and engineering
• Embrace a culture of curiosity, ownership, and continuous learning, this is a place where growth is expected and supported

You’ll be great for this role if you:

• Are proficient in Kotlin and have hands‑on experience with Jetpack Compose for building Android UIs
• Have a working knowledge of MVVM, MVP, or similar architectural patterns and understand the value of clean, well‑structured code
• Experience working with large monorepos and building different flavors of Android apps
• Are comfortable working in evolving codebases and are eager to learn how to navigate complexity and contribute to refactoring efforts
• Have a genuine UI/UX sensibility,you care about building experiences that feel right, not just code that compiles
• Are a team player who has worked alongside engineers, product managers, and designers in a cross‑functional environment
• Bring curiosity, adaptability, and a growth mindset, you ask questions, take initiative, and aren't afraid to say "I don't know yet, but I'll find out"
• Can communicate your ideas clearly in writing and are willing to build your technical documentation skills over time

Nice to have

• Experience with Firebase, Optimizely, or API design
• Experience with Design Systems, motion, or accessibility on Android

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.

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.

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.

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.