I applied through a recruiter. I interviewed at SpaceX in Sep 2020
Interview
Passed the initial phone screen and phone technical interview. Went for in person person technical panel. Presentation was heavily prodded for technical details, including failure modes of fasteners and components. Team decided to not move forwards with process due to insufficient answers to technical design questions.
Multiple rounds of interviews ending with an all day onsite interview. Asked questions about background, classic textbook problems, and coworker interactions. Very technical and difficult. Lots of time spent trying to understand your thought process
4 rounds, 1 with technical recruiter, 1 with engineer, 1 with manager, and onsite. first 3 are over the phone. onsite was the challenge, consists of presentation, one-on-ones, and tour.
Rigorous but fairly reasonable in my experience. The technical problems often has a twist but if you have strong fundamentals you should be able to perform well. The recruiter and interviewers I interacted with are all very nice people.