Google

The interview was really tough. I do not know what questions he asked. He gave me the questions and asked me to understand the code and optimize it.

A recruiter contacted me a while back, and I followed up recently. They set up a phone screen where the interviewer introduced himself and then proceeded to ask me a technical question. He broke it down into easy, medium, and hard difficulty portions

Google software engineers solve some of the most difficult problems the company faces with code. Therefore, the interview consisted of a coding part and some follow-up questions with references for the job.