[troupo]

You need a pragmatic combination of functional and non-functional.

Many functional zealots aim for a purity beyond all reason and comprehension. When what you really want is something like Erlang/Elixir or even C#.

[sureglymop]

What you want is something like Kotlin.

[karmakaze]

I would say F# or OCaml, or Flix as we see here--this language may not be for you.