SpaceX Production Engineer interview questions

I had a phone interview that lasted about 30 minutes. We went over my background and what I had worked on followed by some general engineering questions to test my knowledge. It was a very straight forward interview and was about what you would expect.

I applied online, I was then given an phone call to set up a phone interview. The interview was with two engineers from the group I was applying for. They asked a series of "standard" quiz style qualitative questions about mechanical engineering mostly pertaining to cantilevers. They then asked about a project I was involved with and we had a long discussion about that. ~ 40 min total I then got setup for a second phone interview with the group manager. He did a lot of talking about the position itself and then asked me about multiple projects and experiences on my resume. ~ 30 min total The HR that setup my interviews was very helpful and detailed, but then I got a terse denial email after the second interview.