Just like what everybody has said, don't waste your time. They are definitely not hiring but still interviewing for the sake of increasing their selectivity. I was given an online assessment. It was hard but I managed to finish it in 60 minutes and still having 40 minutes left. 2 days later, I was asked to schedule a phone interview. The phone interview was supposed to be 60 minutes long, but I managed to propose an optimized solution in under 10 minutes, explained the tradeoff and edge cases as well as proof that the algorithm works. The interviewer agreed that the solution is optimum. Since I was really interested in this company, I asked some questions regarding projects and responsibilities. I think the communication was good. 3 days later I got rejection email. They respond fast, that's the only good thing, I guess.