Applied online through Palantir's website, make sure to write thoughtful responses for each of the questions. Had an initial phone screen with a recruiter, then a 30min technical phone round with a Palantir engineer. Moving on led to virtual onsite, which consisted of a 1hr decomp interview and 1hr learning interview. Finally, a 1hr interview with a hiring manager going over some weak points in the previous 3 interviews. All the people I talked to were enthusiastic and easy to talk to. The only complaint about the process is the interval between each round of interviews, which led to the entire process taking about 3 months.