KMongo was created in 2016, when there was no official MongoDB Kotlin driver. KMongo features are available via Kotlin extensions - you use transparently the core MongoDB java driver API (both sync and reactive streams (ie async) drivers are supported).
Performant way to initialize components at the application startup
The Android Startup library provides a straightforward, performant way to initialize components at the application startup. Both library developers and app developers can use Android Startup to streamline startup sequences and explicitly set the order of initialization.