Basically, just imagine someone whose _entire_ job was interview prep and acting. (The guy doing the interview is likely not the one doing the job.) And for anything where they have any gaps, they've got a team of people behind them listening in and feeding them answers.

Basically every single technical, behavioural, or other question got a 10/10 perfect answer. (To the point where "the answers were too perfect" was one of the many yellow flags.) Part of the reason I'm so sure I interviewed one of these guys is I invested a fair bit of time looking into their background and chasing things up. They'd nailed the interview so hard it was worth digging until I found a red flag on the off chance I _could_ hire them.

Honestly the only thing they didn't nail were some of the more "chit-chat" type questions. The guy I interviewed claimed to be in LA while the fires were raging there and... was very confused when discussing the weather and I mentioned smoke.