That's just genservers though right? All of this stuff is just Elixir and generally can be done in Elixir in a few lines of code.

We're experimenting with a truly OTP driven web application right now(No API) where we connect the React app directly to the Elixir backend and only persist to a database on log out. Everything else is persisted in memory and run through genservers which are self healing and self hydrating.