Flight Software applicants have rated the interview process at NASA Jet Propulsion Laboratory with 2 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 76% positive. This is according to Glassdoor user ratings.
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The interview was informal, they asked about the experiences listed on my resume. They dug in a little bit to see how I understood the system as a whole, but overall quick and low stress.