Brief phone interview, followed by a 48-hour technical assessment.
I did not make it past this point, but the next step would have been an on-site visit for a day of touring and interviews.
The phone screen was the usual: introduction to yourself, why SpaceX, etc.
The technical assessment was to solve a problem given a set of constraints. The problem is likely a simplified version of something you'd reasonably have to figure out as a SpaceX Software Engineer.
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.