Senior Android Engineer (Contract) | Kotlin, Jetpack Compose, Coroutines, Flow | High-Traffic Consumer App | £400/day | Remote (UK) | Outside IR35

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