I had an interview with Marin company in April 2019. The process has 3 parts: 1) HR interview, 2) Telephone interview, 3) Virtual onsite interview. The HR interview and Telephone interview is easy. The virtual onsite is difficult. They provide the feedback very late for the interview, and it took almost 4 months.

HR Screen - Phone interviews * 2 - 4 rounds of onsite interviews. The interview process is pretty smooth and I feel unexpectedly satisfied. First step is HR screen. HR will ask some general technical questions but nothing hard. Second step is two rounds of phone interviews - questions can be found in either leetcode or cc150 (all are same questions). Onsite is four rounds of interviews (I know people also got 3 or 5 rounds depending on specific performance). Questions are not hard but some of them need extra efforts. The interviewers are smart and extremely nice. They are very collaborative.