The main challenge would be the information asymmetry between both sides (as is already the case). It's one thing for the recruiter to be able to scan all your contributions. Would you as a potential recruit be able to do the same, and see what skills and techniques were /actually/ in use by the company. A tool which could generate an anonymised summary for both parties and compare them for mutual compatibility might be very nice.

I can picture this...

Anonymous description of a company/profile for the recruiter Anonymous profile of candidates looking for a job...

Swipe left...or swipe right...if both swipe connect them...

F. Why did I post this. Its such a good idea I could make money out of it.

Sounds like an opportunity for a third party 'market maker'

But some of the recent changes in the GitHub profile like code contrib vs commit would already be enough to match against profiles for hire.