Statistics tell me two things: * A sample of one is not relevant * You also used to have many other coworkers that weren't very good at whiteboarding, since e

Statistics tell me two things: * A sample of one is not relevant * You also used to have many other coworkers that weren't very good at whiteboarding, since even very good engineering teams in FANGS have many people like that, and that didn't have that problem since you specifically said you had one occurence of that. So hear me out: maybe there isn't a single predictor that you can just automatically throw at interviewees, like a hard leet code problem, and hope that it will magically filter out the very best engineers for you to pick from. Maybe you should have an interview process that test the different areas I mentioned proportionally to what the actual job you are recruiting for requires.