Referred by a friend and contacted by a recruiter. The whole process included two coding interviews. I passed the first but not the second, then was given an extra coding interview. Overall experience was good.

The first round involved splitting a bunch of nodes into a binary tree, which was easy. The follow-up was splitting them into a tree where each node has N children.

The second round was a task scheduling problem. You were given a constant timeout and a series of [task ID, starting time] pairs, more like streaming mode, then you had to return if a task timed out at a certain timestamp. I didn't fully grasp the concept, but it could be solved using a dictionary.