SpaceX Integration & Test Engineering interview questions

I was contacted by a recruiter after submitting my resume online. I was told I was going to have three interviews. The recruiter told me the first two interviews with engineers from the team would be technical and the third would be with the hiring manager. It was not clear what technical questions would be asked since the team was very interdisciplinary. My first interview was with a senior engineer. Thought it went well, heard back six days after from the recruiter. My second interview was with a different senior engineer. It was the most difficult interview I'd ever done, was not sure if I was going to get an offer. Followed up two weeks later when I had not heard anything since I had an expiring offer from a different company. Got a call two days later with an offer.