The real 30 under 30 imo you have never heard of
twitter.com
twitter.com
People generally don't want to hire those who are smarter than them, because they need subjects below them in the pecking order in order to make themselves look better. There are occasional exceptions, but the people who filter the resumes generally operate under these principles. It's unusual for exceptionally smart or talented people to work as recruiters.
Insightful comment btw, more true than people admit.
Sadly, this is not something that the big tech cos focus on these days. Employees are viewed more as cattle than pets these days.
It's certainly true that hiring managers won't want someone massively overqualified for a role, as they will simply be bored and will likely not stay.
But never seen anyone filter out someone suitable for a role because they seem more intelligent than them though.
Not disputing that people can make odd decisions; just that I have never witnessed what the OP said.