First, I was contacted by the company recruiter through LinkedIn. Then, I had a phone conversation with some technical questions. Next, I got a screen interview, which you could take either online or in person. Since I was only a 15-minute drive from Facebook, I took it in person. Within two days, I was invited for the onsite interview that took almost a day, including a free lunch. They asked me if I wanted more time to prepare for the interviews, and I said I wanted them soon. In retrospect, it was a mistake on my side. I did not prepare enough.

One of several design questions was to design a website that accepts a long URL and provides a shortened URL.

Programming questions are all fundamental data structure questions, such as lists, trees, arrays, and maps. One of the questions was to determine whether a given binary tree is a binary search tree.