I've had some bone headed and careless mistakes make it into production, especially when I was a junior dev, but it was always something that messed up performance or functionality, e.g. a front end widget not responding or an unhandled API parameter.

When it came to user security I _never_ fucked around. I have about 6 years of experience now and consider a trivial and catastrophic mistake like this unconscienably reckless. Never mind 20 years and experience working at a FAANG company.