SWE Internship applicants have rated the interview process at Peraton 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 64.5% positive. This is according to Glassdoor user ratings.
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It was laid back, didn't ask any coding questions. Just asked if I knew agile, and gave two code snippets and asked to tell them the mistakes. Also, it was through the Career Fair at my school, so it might be different if you applied online.