This could be pretty cool for a real time trading system. Go would be pretty solid for the numerical stuff and then BEAM could be used to coordinate all the trading agents. I have written some Elixir modules that call out to C binary executables to do computations that I needed to be faster than what could be achieved with the Erlang/Elixir standard libraries, but had to perform the business logic that called out to these faster implementations in the Elixir code. Will be interesting to watch where this goes.