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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.

Responsibilities

Build new features for the item catalog within the SumUp SuperApp
Help improve the architecture of the application and contribute to our Kotlin Multiplatform strategy
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

Requirements

8+ years experience in mobile engineering with Android and Kotlin
2+ years of experience working with Jetpack Compose
Solid understanding of software design patterns (e.g., MVVM, MVI) and expertise in building modular, scalable app architectures
Good knowledge of reactive programming (Flow, Coroutines and Concurrency)
Strong grasp of testing best practices: knowing what to test, why, and how to write resilient tests
Strive for clean code, and flexible to balance pragmatism and perfection
Keen interest in multi-platform development using Kotlin Multiplatform

Skills

Android
Kotlin
Jetpack Compose
MVVM
MVI
Flow
Coroutines
Concurrency
Testing
Clean Code
Kotlin Multiplatform

Location

Berlin

Work Type

On-site

Experience Level

Senior

Benefits

Regular training
Mentorship programs
SumUp University leadership cohort
Yearly learning budget (2,000 EUR)
28 days paid leave + 1 for birthday
Sabbatical program
Virtual stock ownership program
In-house fitness classes
Gym in the office
Subsidized Urban Sports Club
Available psychotherapy sessions
Subsidized Public Transport Card
Kita placement assistance
Pension Scheme
Language Learning platform/courses

About the Company

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.
Be part of a company that values diversity and celebrates unique perspectives.
Work with a global team of skilled professionals in an environment that fosters collaboration, learning, and growth.
Be part of a global tribe building a banking solution from the ground up and delivering impactful solutions to the real-life problems of millions of SumUp merchants all over the world.

Equal Opportunity

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.
Join a global team where you belong: Check out our D&I Initiatives and Employee Resource Groups such as Pride Club, SumAfro, Neurodiversity, Grupos Mais, Women in Tech, and more