SpaceX visited my college and hosted an info session, where I learned about what kind of resume SpaceX prefers. I made the suggested changes (which was to fade out all non-engineering related extracurriculars, and leave only work exp and projects), and then I gave it to a recruiter the next day at the career fair. I got two calls a few weeks later from two departments. I knew nothing about the first one; a guy called me on his personal phone and started asking questions about my resume on the spot. I know my resume well, and normally this sort of encounter would have been fine, but the fact that it was SpaceX made me nervous, and the interview did not go well. The second department interviewed me through SpaceX HR, which follows a two step technical phone interview process. I knew when and who the call was going to be with, so I had an extra day to prepare. The first interview with this dept was focused solely on my resume. The two interviewers would ask a question about a bullet point on my resume, I would explain, they would dig deeper with more questions, to the point of asking me specifically which formulas I used to solve a specific task or what types of forces/stresses a particular part saw, etc to see if I really took ownership of my work and understood it. Make sure you know what you're talking about by studying every little detail of your past work. If you dont have an answer, try to explain how would find the answer.