EE Intern applicants have rated the interview process at SpaceX with 3 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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I think the process was straightforward. There were two interviews, both were pretty technical but not too hard. I heard back a few weeks later with an offer from them.
Interview questions [1]
Question 1
Digital Signal Processing fundamentals (sampling, filtering, etc.)