Management Assistant applicants have rated the interview process at IRS 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 68.5% positive. This is according to Glassdoor user ratings.
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The interview itself was one round. It was conference call style. Interview was easy and only was 30 minutes. Make sure to tell references they most likely will be contacted at one point of the interview process.