[trcollinson]

I would learn at least one solid backend technology to use for services and processing and one frontend technology.

If I were in your spot I would probably learn Java for the backend technology (with Jersey, Spring MVC, and Hibernate). Personally, I much prefer Ruby on Rails or Python and Django but since your goal is to be hired (and I would assume to be able to move up and make more money), I would stick with Java. It's solid and not going anywhere.

For the frontend I would say Backbone or Angular. I haven't made a decisions here but I would say Backbone is not going anywhere and will be the template for other frontend frameworks for many years to come. Angular is also strong.

Also, grab a css framework. I would choice Bootstrap.