Senior Android Engineer (Contract) | Kotlin, Jetpack Compose, Coroutines, Flow | High-Traffic Consumer App | £400/day | Remote (UK) | Outside IR35
We’re hiring a Senior Android Engineer (contractor) to join a product-focused team building a high-traffic consumer application used at scale.
This is a hands-on role in a modern Android environment — ideal for engineers who care about clean architecture, performance, and shipping high-quality features without unnecessary process.
The Role
You’ll take ownership of feature delivery end-to-end — from shaping solutions with product through to production release.
You’ll be:
* Building and shipping features in a large-scale Android app used by thousands/millions of users
* Working closely with product and design to make pragmatic technical decisions
* Writing clean, maintainable Kotlin code in a modern architecture
* Contributing to architectural direction (not just implementing tickets)
* Improving performance, reliability, and overall app quality
* Reviewing code and raising the bar across the team
* Mentoring mid-level engineers where needed
Tech Environment
* Kotlin-first codebase
* Jetpack Compose for modern UI (with some legacy Views in places)
* Coroutines + Flow for async and state management
* MVVM / Clean Architecture
* Dependency Injection (Hilt or Dagger)
* Modularised codebase
Testing & DevEx:
* Unit testing (JUnit, MockK/Mockito)
* UI testing (Espresso / Compose testing)
* Screenshot testing (e.g. Paparazzi or similar) as part of CI to ensure UI consistency
* CI/CD pipelines (e.g. CircleCI, Bitrise, GitHub Actions)
* Gradle-based build system
What We’re Looking For
* Strong commercial experience building native Android apps in Kotlin
* Experience working on production apps at scale
* Confidence with modern Android stack (Compose, Coroutines, Flow)
* Experience with automated testing, including screenshot/UI validation approaches
* Solid understanding of architecture and code quality (SOLID, clean architecture)
* Comfortable owning features and making technical decisions
* Able to communicate clearly with engineers and non-engineers
Nice to Have
* Hands-on experience with Paparazzi or other screenshot testing frameworks
* Experience migrating from Views → Compose
* Experience optimising app performance (startup time, rendering)
* Exposure to real-time features (live updates, notifications, streaming data)
* Experience working alongside cross-platform teams (e.g. React Native)
Why This Role Is Worth Your Time
* £400/day, Outside IR35
* Fully remote (candidates must be UK-based)
* High-traffic, real-world product — not a throwaway rebuild
* Modern Android stack (not stuck in legacy)
* Engineers have real influence over technical decisions
* Strong testing culture (including UI/screenshot validation)
* Collaborative, product-led team (low bureaucracy, high ownership)
* Clear 6-month scope with strong likelihood of extension