5 technical interviews, including coding, stat, ML problems, research background and etc. The stat interview was about hypothesis testing and some SQL queries. The ML interviews were mainly about recommender systems and how you generate "informative" features?

Two phone screen discussion with the hiring manager who was woefully inexperienced for his position; 4 rounds at onsite including two behavioral with the EVP and a manager from a different team. I have a PhD in NLP and a stellar record. I had interned at top teams for AI/ML (think Google Research grade) during my PhD. I interviewed with Course Hero since they worked on edtech and were a profitable startup unlike most edtech companies. After the phone screen I spoke to the HR and explicitly stated all my competing offers (including 2 Big 4); they said they can match. So I went onsite. Hiring manager posed real problems they in the company blog as interview questions. The article doesn't have anything interesting in terms of solution. It also shows that nobody at Course Hero may any depth in basic NLP; I didn't meet one at the interview either. None of my interviewees exhibited expertise in NLP or edtech. But the discussions with him went at length for 3 hours. If you need me to consult as an NLP expert, I am happy to do so. One of the software engineers on the panel said they don't hav any super difficult problems like in research here which is not true. They haven't realized that they were solving an unsolved problems in edtech/NLP. I will warn experienced folks to stay away from Course Hero. I am accepting a Scientist position with the Big 4.