There were 2 phone interviews and 3 interviews on site before lunch and a demonstration.
The first phone interviewer asked what feature I would add to a vending machine and how I would test it. The second phone interviewer showed me some pseudo code and asked me to add a feature to it. They asked three questions onsite, one in each interview. The first interviewer asked me to pretend like the interviewer was an old grandma having trouble logging in. The second interviewer asked me how I would test a magic box from Calvin and Hobbes. The third interviewer asked me how I would deploy iPhones in Africa for education.
In the end I did not get an offer. They said it was because there was not enough communication in my interviews. I think with that standard, the only candidates they are screening out are the ones who are terrified of interviewing. For a company that prides itself on its technical talent, Palantir has very strange interviews.