I applied by contacting a recruiter on LinkedIn. I quickly set up the phone screen after a brief chat over the phone.

One round of phone interview involved coding on a blank Google Doc for the question: "Given two int arrays A and B, and an int c, return the total number of pairs (a, b) where a is from A and b is from B, and a + b <= c."

The on-site consisted of 5 interviews.

1. Given a node in a BST where each node has a pointer to its parent, find the next largest node.

2. Implement String encode and decode.

Given an int array A, return an int array B such that A[i + B[i]] is the first element in A after A[i] that is greater than or equal to A[i].

Design Twitter trending topics.

Given a list of files, each of which contains some "require METHOD_NAME" lines and "provide METHOD_NAME" lines. Return a working order of files to be processed.

Implement a telephone number management system that assigns randomly, recycles, and checks availability of 10-digit numbers.