Dependency Injection with Koin, interfaces and qualifiers Source code is available at the end of this article. In the previous article, we used Koin to remove manual wiring while keeping a clean …

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Koin qualifiers enable dependency injection frameworks to distinguish between multiple implementations of the same interface. The tutorial demonstrates how to use qualifiers to provide platform-specific implementations (iOS vs Android) for engines and simulators, allowing the same Software class to work with different concrete dependencies. The article walks through refactoring a codebase to use interfaces, creating variant implementations, and configuring Koin modules with named qualifiers to resolve the correct dependencies based on platform context.