Financial Intern applicants have rated the interview process at Google with 4 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 61.5% positive. This is according to Glassdoor user ratings.
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It was the normal google process, challenging but around the same as other tech companies. It was somewhat challenging but if you know what you are doing you will be fine