Being an Erlang developer myself: if you don't actually need the stability of a telecom (e.g. restartless upgrades that hold open circuit-based connections), pivoting around the logic of an Erlang app is about as easy as doing so in Ruby/Python/etc.

Though, that being said, I'd actually recommend Elixir, which gives you the same Erlang-ecosystem benefits, but with the key advantage of being 5x easier to convince the average Ruby/Python developer to use.