[khill]

I agree that you only really need to know several types of languages to (a) prove you can learn what you need and (b) get exposed to different philosophies of problem solving. An OO language, a dynamic scripting language, a functional language, and a procedural language are likely enough.

I think it's also very important to have some exposure to the full stack. I interview too many programmers who don't understand what is really happening inside the computer when programs are running or who don't have enough knowledge about networking, security, or operating systems to tune and troubleshoot issues.

Being well-rounded is important and learning various programming paradigms is only a part of that.