It really depends on the company and market location you're in. Around here (SF / Silicon Valley), there are tons of companies hiring Ruby devs. So if you're ar

It really depends on the company and market location you're in. Around here (SF / Silicon Valley), there are tons of companies hiring Ruby devs. So if you're around here, that's probably the route to go. If you are interested in Enterprise, Java is probably still dominant. JavaScript is a must for front end stuff but I can't say that a lot of companies will adopt it heavily for backend, particularly if most are already established on some stack they've already been working on. My best recommendation without knowing much is go with Ruby and Rails.