A modern programming language that makes developers happier.

kotlinlang

I guess first you would need a decent REST client lib written in (or for) KN, but that's also a very good use-case to me.

Not particularly. It's pretty trivial to create a light api layer around rest requests. As long as you had a way to make network request from kotlin (which I'm not entirely sure how you would. Does the Kotlin stdlib support http?)

You could probably also configure the requests in kotlin and execute them in the native platform in a small lib.