Overall smooth - the interviewer is friendly and polite. However, the questions are higher-level than I expected - they focus on the initiative of the whole project instead of technical details.

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.