Senior Android Engineer (Contract) | Kotlin, Jetpack Compose, Coroutines, Flow | High-Traffic Con...
2 days ago
West End
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