Not sure how big your company is and how large your influence. But it sounds to me like your new hires would benefit from more guidance and oversight. Those mistakes shouldn’t make it production unless nobody gives a damn.
I do get to slam my foot down on some things from time to time -- usually for compliance reasons. Like now when people tell me they need credentials for things so they can run their code in dev on their laptops, I tell them no and that they can use mocks for their testing like a professional.
Funnily the junior people expect and have no problem with this -- it's the seasoned folks who chafe and complain.