SV is full of mediocre engineers; so it fails at guaranteeing you got yourself a star. And I don't think anyone needs more anecdotes to think great candidates lose for arbitrary/subjective/misunderstanding/random reasons
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I'm 15y into my career with a degree from CMU; I am treated like royalty everywhere I work ... and yet I still absolutely dread, hate and repeatedly have bad experiences interviewing for jobs.
I've considered switching careers numerous times because of the emotional distress I go through just interviewing. And that's before we even talk about the insane amount of time every prospective employer demands of you!
If it's making you so stressed out as you claim, then the obvious step, to me, would be a change of scenery.
I have worked an average of 40-hour/week jobs for my entire 30-year career. What's this "demand" nonsense?