Well Kotlin isn't even officially released yet (1.0 candidate came out last week) so no company is probably using it for production yet.

And even after that, it wouldn't be reasonable for any big company to adopt a language that's not at least at version 1.1 or 1.2.

I don't think one can make any pronouncement about Kotlin's success or failures for several years.

I wouldn't be so sure. A bunch of Android developers are severely hurt from being stuck with Java 7. I'd expect many production apps to be written in Kotlin pretty soon, about as fast as the switch from Objective-C to Swift went.

Scala is also an option and currently looks better on the cv.

This will of course improve for Kotlin, specially if they get some Google blessing.

EDIT: Also forgot to mention that on Swift's case, it is a first class language being pushed by the platform's owner, not a 2nd class language without any kind of consideration from the platform SDK.

It's a trivial conversion from Java to Kotlin, as opposed to Scala or Clojure, so I wouldn't expect people to be hiring explicitly for it.

And the fact that 1.0 RC was just released this month might tell you other reasons why. How many Scala jobs did you see advertised when 1.0 was released in 2004?

I wouldn't've described Scala as "gaining momentum" in 2004 either. Kotlin may eventually be successful (I don't think it should be; IMO Ceylon does everything that Kotlin does and does it better, but that's just, like, my opinion man), but the present hype is certainly premature.

I agree - Kotlin is gaining momentum in hype. Give it a couple of years and we'll see how it actually moves. Ceylon does not do Java interop as well as Kotlin does, IMO.