One mini-project data challenge (7 days allowed), followed by 3 rounds of phone interviews. The project set a business background (expanding the for-hire-vehicle service in New York), and asks you to design a metric for evaluating some business decisions (eg. whether to expand the business in some area.) You need to do some hypothesis testings. The project does take time because you need to program a lot and write a report. After that, they scheduled 3 rounds of phone interviews with the team members. The overall process took more than a month. I passed all rounds. Then they asked me for two references (I think this is usually the last step before an offer). After that, I received an email alleging that an HR would contact me in the next week. I received no messages since then.... It does not worth applying, because they showed no respect for my time.