Meta Sr Software Engineer interview questions

Initially asked about computer science concepts on Data Structures, algorithms. Afther half hour of talk, then i was asked to code some algorithm.

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 the 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, psudo-code, then code, and receive suggestions or other form 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.