Highly automated.
They receive far too many applicants for human review.
If you do get through to their technical test, it is also highly automated and timed.
It assumes experience with GCC.
No human review means no room for error.
Short interview with the recruiter to make sure you're a real applicant and still interested, then straight to the technical test mentioned above.
The following metrics were computed from 144 interview experiences for the SpaceX Software Engineer role in United States.
SpaceX's interview process for their Software Engineer roles in the United States is extremely selective, failing the vast majority of engineers.
Candidates reported having good feelings for SpaceX's Software Engineer interview process in United States.