I had one interview, the questions were cryptic and the interviewer did not seem enthusiastic at all. I only had one interview with them as I was not invited back.

The first round was a phone screen. The interviewer started by asking many detailed questions about my resume, including my research experience, technical projects, and the reasoning behind some of the methods I used. After that, I was asked one probability question, which was a classic waiting-time problem. The conversation was friendly and smooth, and the interviewer was very engaging. There was also a follow-up coding component where I needed to use Python, especially pandas and NumPy, to compute or verify the result.