>>azhenl+(OP)
This is Berkson's Paradox. Even if coding competition performance correlates positively with job performance in the general population (which it certainly does, given that most people can't code), selecting for this attribute in the hiring process leads to a negative correlation
among those hired
.
Great write-up by Erik Bernhardsson, CTO of Better, here: https://erikbern.com/2020/01/13/how-to-hire-smarter-than-the....