SWE applicants have rated the interview process at Northrop Grumman 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 74.1% positive. This is according to Glassdoor user ratings.
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I found Northrop at a computer science conference I attended. I scheduled an interview while I was there, and got an offer. The process was not bad at all, it was mainly all behavioral.