I received a phone call a few days after applying for a position online. After a brief screening of my skills, the recruiter set up a phase-1 interview with a single engineer. She gave me the option of doing it over the phone or at Facebook headquarters. I chose the latter because I live nearby. I was scheduled for a 45-minute interview. The engineer was very friendly and inquisitive about my past projects. This is the easy part, talking about myself. He didn't have a copy of my resume, which I thought was lame. Anyway, after discussing my more recent projects, we moved on to the whiteboard coding part of the interview. This part was a pleasant surprise. It was done in a collaborative way, where I would discuss my solution, pseudocode, then code, and receive suggestions or other forms of input from the engineer. The last 15 minutes were spent discussing the culture at Facebook and specifics about the team I was interviewing for. It took them more than a week to get back to me, which I would like to think was because they wanted to complete interviews for the other candidates.

Implement strstr in C.