Finance applicants have rated the interview process at WPP 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 70.6% positive. This is according to Glassdoor user ratings.
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I thought the interview process was very straight forward and simple with only one interview being carried out before receiving an offer. They made the process as efficient as possible.