ELDP applicants have rated the interview process at BAE Systems 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 62.7% positive. This is according to Glassdoor user ratings.
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If I remember correctly there was 2 or 3 rounds of interviews. The interviewers were all very nice and they responded back quickly. The technical questions were based on my resume.