Earlier quoted context omitted.
I studied CS for 4 years and have used exactly none of it since leaving college. Our devs all help with hiring and agree as a 20-person team that academic "experience" means almost nothing unless you have no other job experience. How little academia prepares you for anything in real software engineering has become a cultural meme.
Did your CS degree cover algorithms and data structures? Did you learn Big O?
I work on a very large system, but spend far more time chasing down poor performance due to emergent behavior than I do worrying about Big O on some small piece.