Fairly straightforward. A phone screening is followed by a technical interview for starters. If you make it through both, you get a coding challenge. Focus on just trying to pass a few test cases so you can make it to the next round. I didn't pass this round, but the final round is an in-person "Superday".
Lots of depth-first search stuff.
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.