There may not be that many people doing web development in OCaml directly (Reason ML may be changing this) but it is do-able. Read 'A Lightweight OCaml Webapp Tutorial' - https://shonfeder.gitlab.io/ocaml_webapp/ for a up to date example of an OCaml web stack.

Reason uses the OCaml to Javascript compiler Bucklescript to make OCaml more accessible for web programming. Listen to the podcast 'Reason Town' - https://player.fm/series/reason-town to hear professionals talking about their experience with it.