Palantir's interview process is incredibly long and inefficient. It took 8 weeks from when I was first contacted by their recruiting coordinator, including 4 phone calls, two last minute reschedules, a take home 'assignment', and a cross country flight on less than 24 hours notice just to get a rejection. Around week 5, I spent many hours working on the take home 'assignment', and on week 6 I talked to someone about it for maybe 15 minutes. That engineer didn't even understand the data that they had given for the assignment. I think their inefficiency in interviewing is due to the lack of structure in the company: instead of meeting a couple of people at the level of the position and a couple of managers, you meet 8 people at the level of the position and no managers. You end up dealing with a lot of people with minimum experience as interviewers, and it shows.