[jgj]

As a real full-stack engineer, I see more job postings for front-end than full-stack. And most of the full stack postings I see are for Ruby, which I don't have a lot of experience with, and Java, which I'd rather not do.

And JavaScript, of course. Usually these are titled "JavaScript Developer" but they really mean "CoffeeScript Developer" and no thanks.

All of the opinionating is really to say it only makes sense if it's what you want to do. I happen to like programming (including JavaScript) so I do back and front end. If you don't like JavaScript don't do front end because it can and will get complex, and JavaScript doesn't help you manage complexity.

That said, if your plan is to work on web applications, the more JavaScript you know, the more valuable you'll be (in theory) to your employer/client.

tl;dr maybe