Mobile, Sr Lead Android & Kotlin Developer


Project Description

The client has been building apps that help people communicate in new and surprisingly simple ways since 2005. Our two flagship services, Sideline and Textfree, have been used by over 100 million people around the world.

Sideline gives people a 2nd phone number to organize work and life on one device. As the go-to phone solution for mobile professionals, Sideline is one of the fastest-growing communication apps in the App Store and Google Play.

Textfree makes communication free and accessible, even without a carrier plan. As the original free texting app, Textfree lets anyone with an internet connection call and text for free from a real phone number.


  • Collaborate with the team to optimize existing features and architect new ones
  • Contribute and lead architectural planning and refactoring
  • Wrote unit and integration tests for the required features
  • Work with UX Designers and Product Managers to build our product with the best possible user experience


  • Minimum 5 years’ (idealy 5+) experience building consumer mobile applications on Android (Java and Kotlin)
  • You have strong Android development experience and your code is not only functional but fast and efficient.
  • Deep working knowledge of the Android architecture as well as Google's Material Design
  • Experience with source/version control software, continuous integration, unit testing, build processes.
  • Experience using RESTful web services within mobile applications
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