4 interviews
1st - VP of Engineering, very light and friendly interview, nothing technical at all
2nd - Lead Designer and an Engineer, lightly technical but no challenges of any kind
3rd - Sr. Engineer and an Engineer, very lightly technical, asked about binary sort trees, nothing relevant to practical engineering.
4th - Principal Engineer, this was cancelled "due to a conflict" and was never re-scheduled.
I was then ghosted for 3 weeks before inquiring to find out I was not selected.