Client Solutions Executive applicants have rated the interview process at Nielsen 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 64.6% positive. This is according to Glassdoor user ratings.
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The interview process for me was very similar to interviews I've had in the past. You should be prepared to answer general job interview questions like, why would you like to work at Nielsen. There were also multiple rounds of interviews.