I'm not sure if this will work, the thing is that a lot of good hackers that I know, don't like to spend time on writing nice resumes, sign-up for jobs websites, write a good bio, introduction etc, they simply prefer to do what they like :)
And even after employers contact you, we have optimized to make it easy to ignore them. No chit-chat, you can just click "no thanks."
The employer can ask for some quick qualifiers, FizzBuzz-style questions, to separate the sheep from the goats.
They should take two minutes each to answer and are not intended as an in-depth test or interview.
Afterwards, the employer can move into further discussions and the regular interview process.