Mobile·2026·Solo project

KMP Weather

A small Kotlin Multiplatform weather app — Room, Koin, Ktor — sharing 90% of the code between Android and iOS.

kotlinkmpandroidioscompose

A deliberate small project to learn KMP without hand-waving the hard parts: shared business logic, separate UI per platform, and a clean dependency-graph that doesn't leak Android types into the common module.

weather/
├─ shared/             # KMP module — business logic + DTOs + Ktor client
│  ├─ data/            # Room (Android) and SQLDelight (iOS) splits via expect/actual
│  ├─ domain/          # use-cases, fully shared
│  └─ network/         # Ktor + kotlinx.serialization
├─ androidApp/         # Jetpack Compose
└─ iosApp/             # SwiftUI (consumes the shared framework)

The interesting bits:

Koin in commonMain — wired via a small initKoin() shared from both apps
Stateflow for reactive views — same source of truth on both platforms
OpenWeather API with a 10-minute cache to be a polite citizen

Source: github.com/AltanEsmer/KMP-Weather-App.