At first, they indicated it would be 2. HR was the first basic question and the PM process. Being a 20+ year PM I felt it was a bit odd. The second interview was with the hiring manager and PM. It was a great interaction, with a really good back-and-forth, and they sold me on the idea of working for the company. Few days later ad hoc interview with the VP. I have to say I never had such an odd interview. Present was the same HR person, VP, and the internal recruiter who never said hi at all. HR has the same questions in interview 1, I paraphrased the responses as in interview 1. She even asked whether I was working for the last company I was at. All this was explained many times.