I used Elixir for a project in 2024, though I was not the lead on the backend part, so my exposure was limited. Still got a nice taste of it, and have to say I was positively impressed.
The Erlang VM is kind of amazing in the capabilities that it offers, and integrating with external languages was also easier than I thought it would be (we had a Rust core that we needed to link in).
As for Elixir specifically: the language is nice, but its Achilles heel is definitely that it’s dynamically typed. For this reason I would suggest having a look at GLEAM, even though I have no personal experience with that and don’t know how mature it is.