SumUp enables businesses to get paid easily, process orders quickly, sell online instantly and manage their money more efficiently. We create the tools businesses need to make their business and their customer experience thrive!
As a member of the Global Bank tribe, you’ll play a key part in helping us build SumUp's own digital bank. You’ll be part of a global, autonomous, cross-functional team that takes an aspect of our product and perfect it from concept to execution. Becoming a part of the Global Bank Tribe means working alongside ~250 people with 32 nationalities across Cologne, Berlin, São Paulo, Santiago, Sofia and Vilnius who love to take ownership, work with purpose and help businesses thrive.
As a Senior Android Developer, you'll be part of an experience team that is responsible for building reliable, secure and easy-to-use features inside our mobile app that’s exposed to millions of users across the globe. You’ll empower merchants with a smooth, effortless and engaging banking experience.
What you’ll do
Design, build, and maintain the mobile banking features to empower our global merchant userbase with smooth and engaging banking operations.
Work with large scale, highly available and resilient modern systems.
Write high-quality, clean, and scalable code that meets the highest standards of performance and reliability.
Participate in architectural discussions, propose solutions, and contribute to the technical roadmap of our Android application.
Work closely with designers and product owners to build features that are maintainable, usable and beautiful.
Help us rethink problems we've solved before in a different way as needs evolve and encourage and support continuous learning across the chapter.
Develop a wealth of knowledge about our complex problem domain as well as its implications in the interface and the backend – and how to manage it in a clean way.
You’ll be great for this role if
You have native development experience in Kotlin and are experience in building and shipping scalable complex Android applications.
You have a solid understanding of software design patterns (e.g., MVVM, MVP) and expertise in building modular, scalable app architectures.
You strive for clean code and know how to write flexible tests that won't break.
You have expertise with testing frameworks and know how to implement robust test strategies (unit, snapshot, XCUITest, etc.).
Care deeply about usability, quality, and building seamless user experiences.
You have a product-focused mindset, enjoy collaborating with cross-functional teams, and take ownership of your work.
You thrive in a team where you can learn and try new tech, collaborate on technical challenges and grow as a team.
The Tech We Work With
Language: Kotlin, some legacy code is still maintained in Java
UI: Jetpack compose - our development features are primarily using XML based designs and you are free to choose compose/xml
Architectural Patterns: Clean architecture. Navigation controller and single activity arch. MVVM at presentation layer.
Dependency Injection: Hilt
Communication: Kotlin Flows and coroutines
Detekt and checkstyle for code quality check
Backend Integration: Majority of our tribe integrations are gRPC.
Our new features are done using REST - (Retrofit, Okhttp, moshi standard stack)
Authentication: OAuth
Firebase: For Analytics, remote config and crashlytics. Grafana for better observability and crash alert integration to slack
Testing: JUnit, Mockito and jacoco for reports. UI Testing: We have UI tests for critical flows but we go with pyramid structure where the unit tests are the base and UI tests are at the tip.
VersionControl: Git and github
Why you’ll enjoy working at SumUp:
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
Career growth and learning opportunities: We invest in your development through regular training, mentorship programs, SumUp University leadership cohort and a yearly learning budget (2,000 EUR)
Sabbatical program for tenured SumUppers
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
Health & wellness benefits: in-house fitness classes, gym in the office, subsidized Urban Sports Club and available psychotherapy sessions
A lot of other benefits such as Subsidized Public Transport Card, Kita placement assistance, Pension Scheme, Language Learning platform/courses etc.
Enrollment onto our virtual stock ownership program - you will own a stake in SumUp’s future success.
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.
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.