What is a "front-end developer"? I can do the literal translation, and I can surmise that it means a person who builds and designs UIs, but I always thought that was a designer, not a developer. Javascript is the only thing on what you've just listed that's Turing complete, so look into Node.js, in addition to all the other Buzz Words you see in the rest of the comments. I also think you should come at this with a da…
A front end developer is someone that builds the interface. Designers are becoming programmers more and more nowadays, but it used to be that the designer drew out an interface and the developer built it. Here's a good article about it, as well: http://en.wikipedia.org/wiki/Front_and_back_ends
I'm not sure this is a good thing for code quality and thus app quality.