[endorphone]

Kotlin is just a less verbose, more modern language targeting the JVM. It has nothing to do with mobile apps beyond that Google, much later, decided to support it for Android development.

Go is an efficient platform, however in these switches it usually goes something like "we took something hugely overbuilt, with layers and layers and layers and abstractions and abstractions, and rebuilt it with minimalist Go and now it's faster", which, of course it is.