About the team
SumUp’s Point-of-Sale (POS) solution empowers cafes, shops, bars, hair salons, and other businesses to operate efficiently and grow. It offers a wide range of features, including product catalogs, inventory management, business analytics, compliance support, and loyalty tools.
Our POS solution integrates seamlessly into the SumUp SuperApp, which supports both our proprietary register hardware and mobile devices like tablets and phones.
As a Senior Android Developer, you’ll collaborate with a dynamic, cross-functional team of Product Managers, Product Designers, Engineering Managers, and fellow engineers.
You’ll contribute to the Item Catalog value stream - a core component serving the needs of almost all teams at SumUp.
About the role
We’re evolving toward a Kotlin Multiplatform (KMP) strategy, enabling shared development across Android and iOS. In this role, you’ll learn, refine, and help implement this technology, shaping the future of our mobile apps.
You’re a developer who values user-centric design, precision, and seamless collaboration. You bring structure to communication and thrive in a cross-functional environment.
This role is on-site in Cologne, where face-to-face interactions spark innovation and teamwork.
What you’ll do
Build new features for the item catalog within the SumUp SuperApp
Help improve the architecture of the application
Enhance and maintain our unified android app, distributed across 60+ countries, ensuring high-quality, scalable solutions
Shape the product’s evolution by identifying opportunities for improvement and contributing to daily decision-making
Write thorough documentation and implement robust testing for features before shipping
Collaborate closely with Designer, Product Manager and Android engineers to deliver a unified UX experience across platforms
Coach and mentor other engineers
You’ll thrive in this role if:
You have 5+ years experience in mobile engineering with Android/Kotlin.
You have 2+ years of experience working with Jetpack Compose.
You have a solid understanding of software design patterns (e.g., MVVM, MVP) and expertise in building modular, scalable app architectures.
You have good knowledge of reactive programming (Flow, Coroutines and Concurrency).
You have a strong grasp of testing best practices: knowing what to test, why, and how to write resilient tests.
You strive for clean code, and you are flexible to balance pragmatism and perfection.
You have a keen interest in multi-platform development using Kotlin Multiplatform.
Why you should join SumUp
The opportunity to work on large scale fintech products used by millions of small businesses around the world
A dedicated annual Learning & Development budget for attending conferences and/or advancing your career through further education
Enrollment onto our virtual stock ownership program - you will own a stake in SumUp’s future success
A corporate pension scheme
28 days’ paid leave
You’ll attend global offsites and/or hackathons.
You'd enjoy other great benefits such as Urban Sports Club subsidy, Kita placement assistance, subsidized office lunches and other location-tailored benefits, Babbel language platform subscription and more!
About SumUp
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.
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, color, 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 will not accept unsolicited resumes from any source other than directly from a candidate.
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.