[alx_the_new_guy]

The most obvious approach I can think of would be some sort of post-application questionnare and comparing that to the companie's job posting, sort of, stats.

Say, the company has a lot of job postings, but the all the applicants say they're auto-rejected. That's a decently clear indicator.

Also, if you link your linkedin/stackoverflow/github or something, there could be a more or less automatic way of evaluating you as a candidate in general and your fit for this/similar position, which could be fed back into the post-interview questionnare processing. Obviously, not that good a way to evaluate candidate fitness, but a way nonetheless.

Rings privacy alarm bells, but oh well. Someone could build a decentralized version of it which would work via a browser extension. And, actually, 3rd party hiring companies have a way better relationship with the companies hiring than with the candidates, so I very clearly can see this mechanism weilded against us.