Require government ID, create an org for standardized certification, call it something dumb like "bootstrap certificate", which weeds out all the non programmer

Require government ID, create an org for standardized certification, call it something dumb like "bootstrap certificate", which weeds out all the non programmers. Then you can focus on the remaining that are legitimate candidates. There's more identity requirements and anti spam to a Facebook account than there is in hiring, and in a world of remote work that just doesn't work.