I wonder who the author was thinking of as the audience to this post? It looks like a manual that's targeted at young software engineers to recruit them into FB. And by proxy, the agism that goes on in that company.

I just can't imagine a senior software engineer needs to be told that they need to pick a language to solve puzzles in, "I decided to go with Python" or being reminded that "To refresh my knowledge of the language" is a wise thing to do before an interview.

I bet this guy is a manager.