Currency Converter: Real-Time Exchange Rate App

A native Android currency converter that pulls live exchange rates and runs conversions on demand. The app is small in scope, but the internals are deliberate: Clean Architecture, Jetpack Compose, Hilt, and Kotlin coroutines all wired together the way a production codebase actually uses them.

What the app does:

• Live currency conversion with current exchange rates
• Favorites list for currencies the user converts often
• Light and dark themes through Material Design 3
• English and Turkish UI

How it is built:

• Clean Architecture: Three layers (Domain, Data, Presentation) with explicit boundaries between them
• MVVM: ViewModels expose StateFlow streams that Compose collects directly
• Jetpack Compose: Declarative UI throughout
• Hilt: Dependency injection for repositories, use cases, and ViewModels
• Coroutines and Flow: Async work and reactive UI updates
• DataStore: Preferences and cached values, with type-safe access
• Retrofit and Moshi: API integration with proper JSON parsing
• Jetpack Navigation: Structured screen flow
• AdMob: Banner, interstitial, and rewarded ads for monetization

The app is published on Google Play and useful as a reference for how to keep a small Android app properly architected without over-engineering it.