Senior Android Engineer

Ruby Labs is a leading tech company that creates and operates innovative consumer products across the health, education, and entertainment industries.

• 5+ years of professional Android development experience.
• Experience with B2C mobile apps built on subscription business models.
• Expert proficiency in Kotlin (coroutines, Flow, sealed classes, generics, extension functions).
• Strong command of Google Play Billing Library v7+ and subscription lifecycle: purchase flows, entitlement management, Real-time Developer Notifications (RTDN), and server-side validation (with RevenueCat or equivalent).
• Deep understanding of Jetpack Compose and the Android View system including interoperability and Compose state management.
• Strong grasp of modern Android architecture: MVVM/MVI, Clean Architecture, unidirectional data flow, modularization (Gradle multi-module).
• Proficiency with Jetpack libraries (ViewModel, Navigation, Room, WorkManager, DataStore) and Dependency Injection (Hilt/Dagger).
• Experience with CI/CD systems like GitHub Actions, Bitrise, or Gitlab CI, Gitflow, and Play Console / internal-track distribution.
• Automated testing experience with JUnit, Espresso, Compose UI testing, Turbine, and MockK.
• Strong debugging and profiling skills using Android Studio Profiler, LeakCanary, and Baseline Profiles.
• Experience integrating AI-driven features and/or AI-assisted development workflows.

• Develop and maintain a high-quality Android application focusing on performance, UI, and UX.
• Take ownership of development processes ensuring clean, maintainable, and scalable code.
• Work with cross-functional teams to design, develop, and launch new features.
• Implement CI/CD pipelines and deployment best practices.
• Conduct code reviews and enforce coding standards.
• Profile and optimize app performance including memory, jank, startup time, battery usage, and APK/AAB size.
• Stay up to date with the latest Android development trends and integrate relevant advancements.

Applicants must be located within approximately ± 4 hours of CET (Central European Time) to ensure optimal collaboration and communication.