Phd Student Researcher applicants have rated the interview process at Google with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 63.8% positive. This is according to Glassdoor user ratings.
Here are the most commonly searched roles for interview reports -
Discuss the previous research projects, deep dive on technical details, technical questions on papers (why this method, what will be next steps, etc.), some extended questions regarding previous project, ML basic questions.
The interviewer mainly asked me to talk about my research projects, and he asked questions from time to time. The style might be subjective to the interviewer. Some interviewer might ask several small questions, e.g., ask about ML basics.
Asked my project on my CV, like what is the motivation of the work, what are some technical details, e.g., and then extended to other ML background questions, what method can be used to replace RLHF.