Google

Had a phone interview and an onsite interview. Took part in an interview training program. The training was not very effective, but it allowed me to find the office and gain some familiarity with it.

I had four rounds of interviews, and all of them focused on algorithms. They were all of average difficulty, and no system design was involved. Prior to these, there was a phone interview, which was super easy.

Applied many years ago after finishing my master's degree at a public school. I underwent 5 onsite interviews. The questions were very hard in 4 of them. I received an offer for a very low-level position and grew from it.