First round, coding problem in a laptop similar to the autocomplete problem in leetcode but using a set of objects a list of businesses. Problem did not include most frequent words. Just put it in a trie and search some words.
Second round, system desgin. Something related to Yelp. It was based more on designing APIs and databases.
Third round, behavior simple questions. We also, talked about project I worked on.
Fourth round, same as the third one.