1st - phone screening with recruiter. 2nd - technical phone screening with hiring manager after passed 2nd round, I went thru a take home technical test, which has time limit of 3 hours. It takes 2-3 days for result feedback. 3rd - onsite interview with hiring manager and a senior staff. 4rd - Skype interview with another manager and engineer in SF. 3rd and 4th are placed in 2 consecutive days