Personally? To just restrict it to professionally, I've worked a few places using Erlang. One for providing resource discovery to the rest of the internal syste

Personally? To just restrict it to professionally, I've worked a few places using Erlang. One for providing resource discovery to the rest of the internal systems, one for a financial matching engine and currently at Heroku for the routing layer and the logging layer(https://github.com/heroku/logplex https://github.com/heroku/logplex).