The on-site interview is a day-long event. You will proceed to the afternoon interviews if you pass the morning ones. There are three rounds of technical interviews in the morning, which contain questions on algorithms and design patterns. I did both design on a whiteboard and programming on a computer. The questions may seem more difficult than average. Two of their employees took me to lunch. I was told I did not advance to the afternoon round after lunch.

Some "HARD" labeled algorithm questions on LeetCode.