Senior Mobile Developer (Flutter) (d/f/m)

About radiosphere

We build the full-stack streaming and publishing suite enabling radio stations worldwide to address and deeply engage their audiences digitally and build a future-proof business. Founded as a corporate start-up of the radio station FluxFM, radiosphere GmbH has been developing an all-in-one audio software for the growing streaming market since 2019.

At radiosphere, we are working in cross-functional teams consisting of backend, mobile, audio processing and analytics developers, using various modern tech stacks. Cross-domain knowledge is highly appreciated but not a requirement.

We are based in the heart of Kreuzberg, Berlin but have a flexible, remote-friendly culture. Diversity and open expression are fundamental to our company. You will work together with a team of dynamic, creative and highly motivated people in a surrounding where you can improve and challenge yourself.


As part of our team, your mission is to build amazing audiocentric apps for our mobile users! You develop high standard features that provide a great user experience and make our customers super happy.


  • You helped implement new features in our Apps using Flutter to reach the highest performance standards

  • You developed UI/UX concepts together with our design team

  • You built intuitive and great looking user interfaces

  • You carried out tests, identified technical problems and derived solutions

  • You maintained and improved our CI/CD Pipeline in close collaboration with our Backend Team


  • 3+ years of experience in building complex customer-facing applications (iOS and/or Android)

  • Approx. 1 year of experience in coding apps in Flutter

  • Experience in working with Swift or Kotlin

  • Ability to write well-structured, efficient and maintainable code while actively keeping the quality of the code base in check

  • Excellent analytical and problem-solving skills

  • Team player with a clear communication style

  • Experience in developing audio applications is an advantage but not required

What you get 

  • Become part of the success story of a dynamic, fast-growing company in a key creative industry

  • Make a true impact on the radio and media industry

  • Competitive compensation with fixed and variable components

  • A trusting working atmosphere, independent areas of responsibility and regular, constructive feedback

  • Central location in Xberg

  • Rooftop terrace & BBQ

  • Guest list for access to concerts

  • Bergfest on Wednesday at FluxFM

  • Free boat license at FluxAhoi

  • Flexible working hours

  • Remote friendly culture

Join us now

We are looking forward to reveiving your application. Just send us your resume, earliest start date and salary expectations.

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