I applied online. The process took 2 weeks. I interviewed at SpaceX (Hawthorne, CA)
Interview
Extremely fast if you are a strong candidate and a good fit for the team. (~2 weeks start to finish). Strong focus in fundamental skills and a presentation on projects you had responsibility for.
Interview questions [1]
Question 1
Explain how you would design a noise filter? What are the fundamentals of OOP? What are the different modes of thermal transfer?
Multiple rounds of phone calls, and one onsite, both technical and behavioral questions asked, know fundamentals but you don't have to get every question right, more about the thought process
The process is three phone interviews, two personal and a technical then a onsite interview where you present a project you directly worked on and then follow that up with a bunch of one on ones