I had 3 phone interviews and was flown out for 3 on-site interviews. It's a very rigorous process.
The best advice is to be vocal throughout the interview and explain your thought process. Also, from what I've seen and heard, Palantir loves binary search questions.
Implement a mountain binary search. This involves searching an array that strictly increases from the beginning to a point called the peak, and then strictly decreases from the peak to the end of the array.
The following metrics were computed from 12 interview experiences for the Palantir QA Engineer role in United States.
Palantir's interview process for their QA Engineer roles in the United States is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Palantir's QA Engineer interview process in United States.