I got my wish to one of Lon Chow's startup investments is looking for a backend geek with ruby for a tech cofounder in Chicago and the have agreed to a working app as proof.
Its my two favorite areas local and mobile.
The interesting part is that I have not touched RoR in awhile so I have to bootstrap. In my case I am porting an app/backend from 1.9 ruby and rails 3 to ruby 2 and rails 4 and adding some stuff. Should be some fun exciting days ahead.