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Android Developer

SumUp. A better way to get paid.

Job details

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At SumUp, we are driven to empower small businesses across the globe, by reducing their hassle and helping them to succeed. We are aiming to build the first-ever global card acceptance brand. To get there we are putting together an awesome team that is committed to one another and to our customer. You could be our missing link! Help us bring card acceptance to the masses!

Through our boldness, startup mindset, empathy and our love for product, hundreds of thousands of small businesses in over 31 countries around the world rely on SumUp to get paid. We value entrepreneurial spirit, fostering creativity and building lasting relationships with our employees. We know that a diverse and inclusive workforce keeps us competitive and provides opportunities for all. We believe that together we can help small businesses grow, lift up societies and sustain our environment.

The Job

At Sumup you’ll shape the core experience of merchants who are using the Android App on a daily basis. You´ll:

  • dive into the code and learn how to create clean, composable components in our codebase and use this knowledge to start developing and refining features
  • learn how we write tests, how we manage bluetooth communication, and how we keep performance tip-top
  • develop major features that impact our merchant base
  • work closely with product and design departments to build features that are maintainable, usable, and beautiful
  • help us re-think problems we've solved before in a different way as requirements evolve

By the end of your first year, you'll have a wealth of knowledge about our complex problem domain, as well as its implications in the interface and in the backend – and how to manage it in a clean way. You'll have launched numerous features in the Android app as well as in the Android SDK.

Main requirements

  • You are comfortable with Java and the Android framework
  • You also know how to get things done on the command line
  • You are curious about Kotlin
  • You know what to test, why to test it, and how to write flexible tests that won't break
  • You care about user interaction, usability, and of course making the interface beautiful
  • You strive for clean code, but also know how to make your "shortcuts" easy to delete in a crunch
  • You love coding and take the time to reflect on all aspects of your implementation, be it the frameworks, languages or processes
  • You are not afraid to ask for help or to use Google when something is beyond your grasp
  • Your precise communication skills make working in a distributed team effective and efficient
  • Technology excites you and you strive to learn something on a daily basis!


  • The Mobile Team: You'll be with people who care about mutual learning, keeping our technical knowledge up-to-date, and discussing ideas that not only contribute to the company's success, but keep everyone connected to the wider tech community.
  • Opportunity to attend tech meetups and conferences with the team (especially if you're giving a talk!).
  • Convenient location in the heart of Cologne.
  • All the startup swag you expect: Xbox, unlimited coffee, and a shiny MacBook Pro.
  • Our office has a strong sense of community; we get together regularly for sports, Karneval, and drinks.
  • Our global team comes from 30 different countries creating a fun, international environment

Apply now

Sign up to apply

Or sign up to refer and earn a reward of €300