I'm a signal processing engineer (audio/musical data mining, AI machine learning) who is a web developer by trade. Professionally, I went from Rails -> js -> JavaEE/Spring -> Scala (pretty much do Scala, Akka, and Docker infra full-time now).
I also hack a bit in Clojure. It & Scala are my main interests of late, since I don't really like to touch techs unless they can output signal smoothly at audio rate. :P