The first round was great. Both interviewers were nice and patiently guided me through the technical questions. The best thing with Pfizer interview is that they actually gave the correct answer, so you learn from the interview. However, the second (last) round by the director went badly. First, she did not on her video throughout the whole session. (The technical questions went as per normal.) Second, when it comes to Q&A, she got pissed when I asked about the team culture. She thought that I was asking about individuals and angrily said that everyone is different. Overall, the first and last impression she gave me was very poor.