IME this is why some new companies are extremely choosy with hires for a long time. The newer/smaller the company, the less time there is available for oversigh

IME this is why some new companies are extremely choosy with hires for a long time. The newer/smaller the company, the less time there is available for oversight of each other's work. That is not to say zero review happens, but if you're trying to move fast, trust and confidence in what the rest of the team is doing facilitates that. This may sound overly negative or controversial, but I think there are a lot of tech workers out there that are technical debt factories. They'll produce highly coupled code, super long functions, inefficient code, etc...and be extremely defensive during code review. The mantra you'll hear from this person is, "but it works!" - which is exactly what the PM will hear. So it gets shipped. After this happens enough, "simple" changes to the product that should be easy to produce, aren't so simple.