There were 2 screens, 1 with recruiter, 1 with engineer. I applied for multiple roles, got 2 different recruiters and after calling the first, the other ghosted me. Was able to switch to the role with a "better fit". Recruiter's technical questions seemed to "prepare" you for the real thing. The second screen was also positive, and in general the recruiter is responsive to questions until they "reject" you. I knew it was over when they stopped emailing for ~1 week (turnaround time between scheduling next calls was usually 1-2 days otherwise), but I didn't get an official rejection until over a month later which was kind of bogus.

The interview process for spaceX is meticulous. They have several rounds and ask college knowledge of engineering principles. Be sure to brush up on these before going into the interviews