in fairness to some interview processes there are ways you could legit pass a valid interview and then short change the job. We do a problem scenario / proposed solution that's shared a few days in advance. Good candidates (and good frauds) can ace this with strong technical skills, relevant experience and maybe an hour or so of prep time. We'd take this as strong signal, because (and I'd hope more companies do this) we're optimizing for talented candidates, not minimizing people who are going to work multiple concurrent jobs.

> but they themselves aren't good at the job they sell themselves as doing.

In my opinion and experience, being a competent developer and being a good interviewer are even less related than being a competent developer and being a good interviewee (and the latter are already very unrelated).