An experienced programmer can learn a lot about a new language in a relatively short period of time. A lot of times, the language isn't the issue, understandin

An experienced programmer can learn a lot about a new language in a relatively short period of time. A lot of times, the language isn't the issue, understanding the system is the issue. So I don't think it's the first thing I would think of when deciding to hire someone. If an engineer has worked on cool things, and done cool things, I wouldn't care if they didn't know X.