You are wrong on that it is an Android only thing. I use it on the backend. Lots of Java backend frameworks are moving towards either supporting/recommending Kotlin or even porting to it. E.g. okhttp just released a fully backwards compatible v4 that has been completely ported from Java to Kotlin. Spring is recommending Kotlin over Java and optimizing their frameworks for Kotlin. Spring probably represents about half of the industry; particularly enterprise/fintech setups.
If you are planning to do work involving Spring 5.2 and up, you should be planning to move to Kotlin as they are adding co-routine support in Spring 5.2 and it makes the flux/reactive mess they released a while back a lot more user friendly. IMHO any new Spring Kotlin project will be much more likely to use Kotlin than Java very soon. Any new project that isn't is doing it wrong.
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You are wrong on that it is an Android only thing. I use it on the backend. Lots of Java backend frameworks are moving towards either supporting/recommending Kotlin or even porting to it. E.g. okhttp just released a fully backwards compatible v4 that has been completely ported from Java to Kotlin. Spring is recommending Kotlin over Java and optimizing their frameworks for Kotlin. Spring probably represents about half of the industry; particularly enterprise/fintech setups.
If you are planning to do work involving Spring 5.2 and up, you should be planning to move to Kotlin as they are adding co-routine support in Spring 5.2 and it makes the flux/reactive mess they released a while back a lot more user friendly. IMHO any new Spring Kotlin project will be much more likely to use Kotlin than Java very soon. Any new project that isn't is doing it wrong.