First and second one very nice, great process and conversation. third interview with next manager was extremely unprofessional. He wasn't on camera, very dry, kept saying it wasn't his decision (then why are we in this interview?). Rejection came from an AI generated email after 2 weeks after emailing the manager to follow up if they made a decision.

It was very pleasant and professional, HR and several hiring managers attended the 1.5hour call. I gave a presentation for a case study that was handed to me about 1 week ago. It was a very interesting case study and presentation generated very interesting discussions.