I had two rounds of Skype interviews where you code in your browser while commenting and discussing with the interviewer.

On the first interview, I received three relatively easy tasks, classic job interview questions. On the second interview, I received two medium-difficulty tasks.

After that, an on-site interview lasting a few hours, with four interviews in total. Each interview lasted about 60-90 minutes. You get one to two tasks, depending on the interviewer. The first one is moderate difficulty, and the second one is difficult.

You can code on the whiteboard or a laptop they provide, or both. Depending on the position, there can be five interviews, where the fifth one is architecture/design.

You have to get four positive reviews, or three positive and one neutral, to get the job.

You have a binary tree filled with numbers. Find a way to quickly calculate the median of the tree.