Intermediate Kotlin Developer

Hire Resolve’s client is looking for an Intermediate Kotlin Multi-Platform Developer to join a dynamic team rebuilding a core banking application for a leading UK Bank. This is a greenfield project using modern mobile development practices, including Kotlin Multiplatform Mobile (KMM), Jetpack Compose, A/B testing, and AI-assisted UI generation. The ideal candidate will have strong Kotlin experience, exposure to cross-platform development, and a practical, problem-solving mindset.

Responsibilities: 

• Develop and maintain high-quality Android and iOS applications using Kotlin Multiplatform Mobile (KMM).

• Collaborate with a small, talented team of developers, architects, and testers.

• Implement modern UI using Jetpack Compose and follow platform-specific design guidelines.

• Integrate and manage A/B testing frameworks and feature flags for controlled rollouts.

• Write clean, testable code and participate in code reviews.

• Contribute to CI/CD pipelines and automated testing processes.

• Work closely with product teams to analyze experiment results and optimize features.

Requirements: 

• Kotlin & Mobile Development:

  • Strong practical experience with Kotlin for Android.

  • Exposure to iOS development concepts or KMM.

  • Understanding of Android/iOS app lifecycle and UI guidelines.

• Architecture & Modern Practices:

  • Experience with modern architectures (MVVM, MVI, Clean Architecture).

  • Proficiency in Kotlin Coroutines and Flow for asynchronous programming.

  • Knowledge of RESTful APIs, Retrofit, JSON parsing, and dependency injection (Hilt/Koin).

• A/B Testing & Feature Experimentation:

  • Hands-on experience with A/B testing tools (Firebase Remote Config, Optimizely, LaunchDarkly, etc.).

  • Familiarity with feature flags and experiment-driven development.

• Testing & CI/CD:

  • Strong unit and UI testing skills (JUnit, Espresso, MockK).

  • Experience with mobile CI/CD tools (GitHub Actions, Bitrise, Jenkins, etc.).

  • Proficient with Git and collaborative code reviews.