My onboarding at one tech company was literally being handed 2 flatpack boxes to build my own desk and chair.

Literally nothing else. Just expected to get on with what my job was supposed to be independently. No meetings, no setting of goals or expectations, no nothing. I did all of that myself.

Slowly started taking on the work of multiple other roles in the company all put together and once it became 3 jobs in one I got the fuck out of there.