The interview process was very pleasant and lasted for about a month.

The first round was a screening based on an online technical coding test on HackerRank.

Next was a technical phone interview.

After that, I was invited onsite for three rounds of technical interviews.

All the interviewers were very encouraging and kept dropping hints to guide me to the correct answers.

Phone interview:

• Is a binary tree a binary search tree?
• Given an input file with four billion integers, provide an algorithm to generate an integer which is not contained in the file. Assume you have 10 MB of memory.

Onsite:

• Merge two sorted linked lists. Questions on time and space complexity.
• Given a log of pages clicked on Zillow's website by users (sorted by timestamp), find the top ten most clicked 3-page sequences. A 3-page sequence is a sequence of 3 pages clicked by the same user in successive order.
• Implement an LRU cache.