Palantir Technologies Intern - Software Development interview questions

First there was a screening interview with an HR over the phone. She asked about the projects I've done before, about my CV. Then they have sent me a coding challenge on HackerRank. I had 90 minutes to find a solution and code it.

I dropped my resume off at the career fair and was contacted by a recruiter. She set up a phone interview and had a 45 min technical phone interview with one of the engineers. The questions were pretty straight forward, but they focused more on algorithm design and thinking of efficient solutions, no coding for this interview. I wasn't too thrilled with the interviewer, because he seemed to be in a rush just to get the interview done and over with. Even when I initially asked questions about his job, what he was working on, etc, he spoke quickly and wanted to move onto the technical part asap. My impression is that these are smart people, but maybe too boxed into work for me.