Residential Concierge applicants have rated the interview process at Hilton 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 73% positive. This is according to Glassdoor user ratings.
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Short, they primarily seem to go off of immediate chemistry with the current staff and didn't ask many questions. The difficulty lies in trying to make a really amazing first impression.