>I would have no time at all to do anything if I start looking at all my candidates' github links.
How do you decide to get the candidate in the pipeline? Presumably you're reading a CV and a letter, then having a phone call, etc. You don't think it would add context and clarity if you took 20 minutes from those activities and devoted them to examining a specimen?
Do you do whiteboard interviews? I've never done one less than an hour, and I think you'd be able to glean quite a bit of the same information by looking through the log.
Do you do homework? Who examines it? Could you not get similar perspective from looking at contributions on GitHub?
>I would be more than happy to look at a portfolio showing products built by them
To me, a candidate that has full-blown products out there is fast-tracked.