I applied through a recruiter. The process took four weeks.

• Phone interview: DS and algorithm. Passed.
• Four rounds onsite: DS, algorithm, and project deep dive. All went well, and I gave optimal answers.

After several days, the recruiter came back and said they wanted another round of interview with the co-founder. I spent another two hours talking to him and then got rejected by him after a few days. The rejection reason was that the interview result was good, but the position was filled and there was no more headcount. I guess it's not the real reason. Anyway, it's very disappointing after going through such a long interview process, especially since the interviews went pretty well. After this, I got offers from another five big tech companies in the Bay Area and found their interview process was much easier.

Talk about Java multi-threading.