I'd suggest C, since you already know Java, and that'll get you closer to the metal. Do some little stuff on an Arduino or whatever. Then, there's some differe

I'd suggest C, since you already know Java, and that'll get you closer to the metal. Do some little stuff on an Arduino or whatever. Then, there's some different paths. More metal means C++, Rust, D. More webdev means Elixir/Phoenix, Ruby/Rails, PHP/Laravel. More systems means Erlang, Elixir, Ruby, Go. If you just want to round out your skillset, conisder Elixir, Haskell, Clojure, OCaml.