They sent me a basic HackerRank challenge (not too difficult, but I messed something up right at the end so it wouldn't compile). Then, they sent me an email about two weeks later with a rejection.
This was a basic hour-long HackerRank question. I was given the same one as others who applied, but I assume the questions change year to year.
The following metrics were computed from 19 interview experiences for the Dropbox Software Engineering role in United States.
Dropbox's interview process for their Software Engineering roles in the United States is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Dropbox's Software Engineering interview process in United States.