I am very happy with my recruiter and coordinator, as they were very helpful and responded quickly. But Twitter lacks a system of choosing eligible interviewers and a standard for interview questions. The phone interview is super easy, more like a freshman CS101 stuff. Then I was invited onsite with 4 rounds of technical interviews and 1 round of culture fit interview. One of the interviewers was 8 minutes late for my 45 minute session, and he can't really speak good English. He looked really geeky and didn't know how to start a conversation. So I started to introduce myself and my projects and he didn't control the pace at all. With only 20 minutes left, he asked me to wrote a maze generation. For god's sake, my friend actually wrote a maze game before and it took him a week. I would say this interview question is too hard to be finished in 20 minutes if you didn't not see the problem before or even not memorized the code. So I guess you just need to get some kind of luck to get a good interviewer. My friend was asked reversing a string and factorial number when she was onsite.