This pretty much is the opposite of an employee onboarding environment. Much of the discussion here is about automating things via scripts. A typical large enterprise uses a bunch of HR and related systems that are fairly resistant to automation. If you can automate, it may be a massive saga involving cooperation from the vendor of some arcane software.

e.g there is no concept of a "clean environment" when you are interacting with a benefits system, a payroll system build last century, a manual procedure where Barry downstairs has to cut you an access card, etc. etc.

You can aspire to automate these steps but they are 100 x as hard as running bash scripts on a box. And onboarding new employees does not typically happen often enough to justify the effort.