Totally happens, even though it is not supposed to. If a dev didn't outright break the rules then they shouldn't be blamed. The rules in this case would be some

Totally happens, even though it is not supposed to. If a dev didn't outright break the rules then they shouldn't be blamed. The rules in this case would be something like "a peer must review before deploy" - if you bring down the site after breaking that rule, you're going to get fired most likely. I've never had COEs come up in my or others' performance reviews. If the boss who owns the COE "gets it" and has internalized the old-school Amazon culture then there won't be blame. The bosses really take the hits here, they do get personally blamed for these things. If they can't stand between the team and the more senior management then they are not doing it right. If you and your boss mutually hate each other (which unfortunately I have seen) then it won't go well.