Structured and smooth. 3 rounds of interview with technical interview with developer, Ent architect, hiring manager. some techical questions about architectural conundrums and challanges. i asked for feedback on how i did every round just to make sure i'm doing ok.

Some HR disguised as technical recruiter took the first round. He had a set of questions all definitions and formulas he asked. I responded as is. Cleared the round. They keep calling and saying they will schedule second round,take my slot then never keep the interview.