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Koin

Koin is a lightweight dependency injection framework for Kotlin applications — Android, Kotlin Multiplatform, and server-side Ktor apps. It offers a pragmatic, idiomatic Kotlin API without code generation, making it faster to set up than Dagger/Hilt and increasingly popular in modern Android and KMP projects.

What is Koin?

Koin provides a DSL for declaring modules, constructor injection, property injection, scoped instances (singleton, factory, scoped), lazy injection, and integration with Android ViewModels. Unlike Dagger/Hilt, Koin resolves dependencies at runtime rather than compile time, which trades some safety for simplicity and faster build times. Koin also supports Kotlin Multiplatform (KMP) for sharing DI configuration across Android and iOS targets.

Why Koin matters for your career

Koin is a strong alternative to Hilt in projects where simplicity and KMP compatibility are priorities. Android engineers familiar with Koin work productively in the growing ecosystem of KMP projects, making this skill increasingly valuable as cross-platform Kotlin development expands.

Career paths using Koin

Koin skills are relevant for Android Developer, Kotlin Multiplatform Engineer, and Full-Stack Kotlin Developer roles. Companies adopting KMP value engineers fluent in Koin for sharing DI patterns across platforms.

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Frequently asked questions

Koin vs. Hilt — which should I use for Android?▼

Hilt is Google's recommended DI framework for Android and has better IDE tooling and compile-time validation. Koin is simpler to set up and better suited for KMP. For pure Android, Hilt is usually preferred in Google-aligned projects; Koin is gaining ground in KMP-first teams.

Does Koin have compile-time dependency verification?▼

Koin 3.2+ introduced `checkModules` for verifying the dependency graph at test time. This isn't as rigorous as Hilt's compile-time checks but closes the gap significantly.