Probably four rounds with various layers of the product org. No practice project required. Everyone was very nice, but the general HR people were ineffective and superfluous. They missed my first interview and it probably wouldn't have been rescheduled had I not continued to follow up.

Only got through the application process. Wanted to send this as a warning to anyone applying, as part of the application, you are required to do an SAT-like skills assessment. It took almost a full hour and your application was not submitted unless you finished it. Had I known that going in, I wouldn't have applied. There's no reason to make an applicant perform this kind of assessment prior to submitting their application. To add insult to injury, I received an automated rejection email two days later. I spent over an hour on their application and didn't even get to speak to anyone about the opportunity. Stay away!