Summer Internship Program applicants have rated the interview process at SpaceX with 5 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 53.4% positive. This is according to Glassdoor user ratings.
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Short get to know you in the beginning, asked to go over my resume quick, then moved onto some more difficult technical questions. Very nice people, but heavy content interview!