I had 6 interviews in total. The first was the manager with a technical screen, then there was a round of 2 phone calls (one C++/software, the other position-domain-specific), then a half day/3 interview virtual onsite (two domain-specific, one programming in python). The interviews were comprehensive, but manageable due to most being heavily focused on the product area domain which my experience matched well. The programming interview was difficult for logistical reasons rather than content - it was done in a Google Doc with a hastily typed question - it's very hard to keep track of your algorithm when it keeps inserting line and page breaks. Not sure why leetcode/hackerrank/etc. wasn't used - interviewer might have just been too busy to set it up. All other interviews were very positive experiences. The whole process (which started on LinkedIn) took about 2.5 months. The final stage took place with the recruiter where remote/relocation arrangement was reached.

Two technical interviews if you pass you got invited to the third interview that will be with HR. If you pass (the two technical and hr interviews) you will receive an offer.