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.
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 Berlin, 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!
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.
Top Skills
What We Do
SumUp believes that every business should have access to affordable, easy-to-use financial solutions, no matter their size. That’s why more than 3 million businesses worldwide rely on SumUp to run their business. What started out as one card reader has now turned into a range of payment hardware, banking solutions, marketing, and loyalty tools, invoicing, and so much more. From sales and marketing to product and engineering, our cross-functional US team works together to ensure that small business owners can be successful doing what they love.
Why Work With Us
SumUp USA is part of the global SumUp organization that stretches across multiple continents from Berlin to Sao Paulo. Our teams are multicultural, have a collaborative mindset and bold goals. Join our mission if you want to become part of the success story and help empower over 3 million merchants using SumUp already!
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