I was referred by a friend and given a coding challenge, which I completed well, though not perfectly.

Following that, there was a phone call with a brief conversation (e.g., "Why Palantir?" "What are you looking for in an internship?") and another coding challenge.

I heard back a few days later to schedule an on-site interview in a few weeks.

During the on-site, I had three technical interviews in the morning: two technical and one decomposition (see their site for what that is).

After the interviews, there was a presentation called "Palantir 101" to describe what the company does.

We were then supposed to have lunch with an engineer, but that turned into another decomposition.

After that, I was told I made it to the "next round," though I assume the decision was made during Palantir 101 and the "next round" was also the decomposition I had just completed.

I had an interview with the Hiring Manager that afternoon.

I went home after that and received an answer within the next week.

Basic tree/caching/class questions.

Nothing too hard, but the questions all had a right answer and an extra-mile answer.

Like I said, see their website for what a decomposition is.