I applied online. The process took 2 weeks.
Got a call from an L2 engineer. Email said 30 minutes, but we talked for an hour. Basically grilled me on my resume and took me through a few hypothetical design scenarios. Questions ranged from mechanics of materials to statics to fluid mechanics.
The following metrics were computed from 3 interview experiences for the SpaceX Engineering Internship role.
SpaceX's interview process for their Engineering Internship roles is fairly selective, failing a large portion of engineers who go through it.
Candidates reported having very negative feelings for SpaceX's Engineering Internship interview process.