3 rounds you are lucky if you get contacted hr for phone screen - very general, nothing asked about work experience technical for deep knowledge test, very good attitude of interviewer, will make sure you don't feel pressured, but will definitely grill panel -5 hour interview

Very long timeline from initial recruiter contact (via LinkedIn) to actual final offer. Had initial phone screening in late July, had four rounds of interviews over the next 7 months until final offer in February.