Our client is seeking a Lead Android Developer to join their team for a freelance B2B contract that is expected to last for an initial 4-month period, with an expected extension of 6+ years. This position is 3 days on-site in London and 2 days remote.Project details:Position: Lead Android DeveloperContract Length: Initial 4 month periodStart date: ASAPLocation: Hybrid in London, 3 days per week and 2 days remoteLanguages: English SpeakingSkills and Responsibilities:Experience mentoring junior developers and leading mobile teams.Hands-on Android development experience.Strong in Java, Kotlin and Android SDKExperience in Jetpack Compose and RxJava.Proficient in Android Studio, Gradle modularisation, and multi-flavour builds.Deep understanding of architectural patterns like MVVM, Clean Architecture.Familiar with Analytics platforms like Firebase, Adobe Analytics. Experienced in UI/UX implementation using Jetpack Compose and/or traditional XML-based layouts.Strong knowledge of asynchronous programming using Jetpack compose, RxJava, Flow or Coroutines.Strong experience in integrating and securing GraphQL/RESTful APIs.Proficient in unit testing, instrumentation testing, and frameworks like Junit, Mockito, Espresso.Familiarity with Google Play Console, app signing, release pipeline, crash analytics, and A/B testing.Hands-on experience with CI/CD pipeline tools (like Jenkins, GitHub Actions, Bitrise, or CircleCI), automated testing, and deployment strategies.Experience with version co