Space Planner applicants have rated the interview process at NASA with 4 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 84% positive. This is according to Glassdoor user ratings.
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The interview was pretty nerve racking and I was asked a lot of questiojs that I have signed an NDA to not disclose unfortunately. However, if you have a strong background in space planning you should not have any trouble doing very well in this interview.