Android Developer (f/m/x)

Job description

The COBI.Bike Software Team is looking for a passionate & experienced Android Developer who is enthusiastic about connected mobility and hungry to take on app development responsibilities at our rapidly growing start-up. Our team works full-stack across embedded, mobile (iOS & Android) and the cloud to ensure a seamless interplay of hardware and software. 

The candidate lives & breathes Android and will work closely not just with developers in the Software team, but also with our conceptual- and visual designers to meet the highest levels of quality and polish for the Android app that is only enabled by deep collaboration.



  • Participate in the planning process for new app features and explore Android-specific opportunities to improve the COBI.Bike experience on Android (e.g. Android Wear)

  • Plan, build and test features according to existing API- and User Interface designs. Optimize the application for maximum performance, scalability and compatibility across the Android device landscape.

  • Participate in the COBI.Bike App (Google Play Store) and COBI.Bike SDK (GitHub) architecture, release and deployment lifecycle

  • Work effectively with legacy code with a respectful mind, and build good architecture, and API design out of it


  • At least 3 years of experience as an Android Developer.

  • Proficiency in Java, and Kotlin. You have strong understanding about Android SDK, knowing how to use which API to build optimal, and bug-free apps in terms of runtime performance and memory management.

  • Experience in architecting Android apps with MVVM/MVP, Clean Architecture, RxJava, and the Architecture Components library (Android Jetpack for now).

  • Experience with building adaptive layouts, fluid UI animations, and custom views. Bonus: ConstraintLayout is your favorite weapon but you understand clearly its trade-off.

  • Experience with writing maintainable, and readable unit tests. Bonus: Experience with JUnit, Spek, AssertJ, and Mockito.

  • You have the ability to conduct nice, respectful, constructive yet efficient code reviews on GitHub pull requests.

  • You care much about the quality of the code. You love writing clean code while still able to understand the need of moving fast. You pride yourself on clean API design. Bonus: Experience with Bluetooth Low Energy (BLE) on Android

  • Bonus: Experience in functional programming. You understand the importance of immutability, pure functions, and efficient state management.

  • BS/BA in Computer Science or Software Engineering, or equivalent experience


  • Creative, multilingual environment and a culture that is supportive, dynamic and encourages professional growth

  • Competitive salary, great Apple IT equipment, free beverages and fruit, regular team events and celebrations

  • E-Bikes for private testing purposes and company leased bike possible

  • Development budget for every employee, a nice office in the heart of Frankfurt am Main

  • Market-proven and fast growing company with the security of a large corporate

  • 30 vacation days, relocation and visa service for international candidates