[yiyus]

Your example is excellent. I agree with you in that choosing a developer in basis to a github profile is not much different from choosing a handyman in basis to what he does in his garden on the mornings. What if there was a much cheaper and more efficient handyman living up the street, but he always works in his backyard so you have never seen him outside?

I am sure you can find valid candidates with your method, but also that you could be missing much better ones.