Wintel Engineer applicants have rated the interview process at Randstad US 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 66% positive. This is according to Glassdoor user ratings.
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Slow but is a part of the review of your resume but i think that 2 months is too long. The Interview is easy but predicible in questions like Why do you want to work for us? That is a common question