One well-known company I worked had a data breach published online and reported on. I know people on the accounts team and security team and have seen the code

One well-known company I worked had a data breach published online and reported on. I know people on the accounts team and security team and have seen the code for how passwords are hardened. No one internally who knew those systems thought it was a breach; it was more likely people reusing credentials that were breached elsewhere.