I've been programming for over half a century. I've seen a lot of programming languages come and go. They are really not that important. The reality is Domai

I've been programming for over half a century. I've seen a lot of programming languages come and go. They are really not that important. The reality is Domain Knowledge is the key to competency, i.e. something like device drivers, geology, or something else that's relevant to the project. The problem is recruiters don't seem to know that. As others here have said, be familiar with the basics of currently popular languages. While working with a language you can look up the rest as needed until you have mastered it.