My interview with Palantir is probably my most favorite interview of all time. My first interview was with an engineer at a job fair. After telling me a little bit about the company, he asked me some very basic personality questions. He then gave me a series (3?) of fairly challenging algorithm problems. I remember the solutions being non-obvious, but simple. He had me write the solutions in pseudocode on the back of my resume and hand it in. My second interview was over the phone and very much like the first. I was given another set of algorithm problems, one of them was a repeat from the job fair. This time I simply had to describe the solutions to the interviewer. My third interview was also conducted over the phone. I was given a few relatively simple problems and told to write the solutions in C code and speak it to the interviewer. Semicolons included. I was not expecting this kind of test AT ALL, and I hadn't written C code for a year or so. At that time, it would have been taken me a little extra time to write it in an IDE, much less writing it down and speaking it over the phone. Anyways, I ended up making quite a few errors, which when combined with my "uhhhs" and "ummmms" surely prevented me from going any further. I didn't think my final interview was conducted too fairly. Had I been given some warning that I'd be literally speaking in C code, I could have at least brushed up on syntax and standard libraries. I'm also not entirely sure I understand the need to vet everyone with difficult algorithms questions when the work sounded like pretty run-of-the-mill software development. Regardless, I very much enjoyed the interviews - they were quite challenging.