Google

A Google recruiter emailed and called me out of the blue, stating that someone internal (without specifying who) had made a recommendation and wanted to know if I was interested in a position. They were very positive and made it sound as if they were

The first interview was over VoIP and screen share. After that, there were five on-site interviews. One of the interviews was about system design, and four were about designing algorithms and using data structures to solve given problems.

The process, applied through referral, takes 3 months. First, there is an online coding assessment. Next are two rounds of on-campus interviews and four rounds of on-site interviews. The on-site interviews include a lunch round.