I applied online.
Pretty straightforward process. If you are not a good fit, they will recommend you to a different team. They are pretty serious people, so do not get scared; they want you to be concise as well.
The following metrics were computed from 47 interview experiences for the SpaceX Engineer role.
SpaceX's interview process for their Engineer roles is very selective, failing most engineers who go through it.
Candidates reported having good feelings for SpaceX's Engineer interview process.