How to Search for a Premium back-end Web Developer?

Hey guys, I was wondering where the place are to look for a first class back-end web developer.

I am only 24 but am a partner with a funded wall street startup that is in stealth mode. I am in charge of putting together an all star web development team yet I am a bit lost on where to find the best.

My strategy so far has been to poke around hackernews, techcrunch, mashable lists, LinkedIn groups etc. I have found and interviewed some good options but I have not been dazzled by any.

My question to you guys is>>>is there an alcove somewhere on the internet where the best in this field congregate??