Our software engineering job posts on LinkedIn & Indeed generate hundreds of applicants per day, the vast majority of which can't code at all. Attempting to sift through them is just too costly so we mostly use alternate sources: tech recruiters, more selective job sites. The problem is those sources heavily filter themselves and don't always use the most fair criteria.
We used to have unique challenge problems online to offer a more level playing field, but solutions were constantly posted to github so even that became quite time-consuming to maintain.
We're still hiring at a decent rate, but do have more headcount than we can fill right now. There are definitely qualified candidates out there but attempting to filter them from the mass of applicants is difficult.
Trying to 'hack/red-team' your own system may reveal weaknesses and flaws you weren't thinking of and help the hiring process. See what penetrates, what doesn't, chat about it over lunch, etc. And yes, it does seem like taking an adversarial approach towards your very own hiring processes is insane, but here we are.
I'm convinced that interviewing for programming jobs and being able to code are two different skills. Making it worse for myself is that I come from the military and IC so i dont have any public blogs or Github activity so i can't pretend to be a "thought leader", which I'm also pretty sure is a bullshit term.
Working on a side project and creating a real Github commit stream is also useful.
I know one person, she's a data analyst (2 years experience, +5 years of marketing experience) here in the bay area. hasn't been able to get a Data analyst job for 3 years now, even after applying thousands of jobs and interviewing dozens of times. Finally, she was forced to take an after school baby-sitting job for 17$/hour (bay area).