Kotlin is really very similar to C#. Java developers shouldn't have much of a problem either (now that Java finally has lambdas), and I hear Scala is mostly a s

Kotlin is really very similar to C#. Java developers shouldn't have much of a problem either (now that Java finally has lambdas), and I hear Scala is mostly a superset of Kotlin. GraphQL and (Kotlin or C# or Java or Scala) probably isn't that small of a niche. Edit: Also, Kotlin does have near total compatibility with Java and can use any Java library (aside from the most magical bytecode-rewriting annotation processors) so I don't understand what you're saying about having to rewrite things that exist.