I was contacted by a recruiter and had a phone chat with her the next day. After a week, I went to the in-house interview.

I arrived 5 minutes before the scheduled time and waited for 20 minutes in the reception area. My scheduled interviewer could not make it, and they found a young engineer to interview me instead.

He was friendly and had worked in the industry for only 2 years. The conversation started almost as if I were the interviewer, as he introduced himself and told me what he does at Facebook for about 5 minutes. He then asked me what I do in my current project and proceeded with a coding question.

I solved the question in Java, tested edge cases, modularized the solution, and discussed other potential solutions I could think of. We had a nice conversation, and the interviewer agreed the solution given was good. He ended the interview by giving me the opportunity to ask any questions.

They did not proceed to the next stage with me, and I was surprised. Obviously, I missed something, and I do not know what that is. I asked the recruiter for feedback via e-mail and did not hear back.

My current project and how I scale our applications.

Given n nodes and an X node, find the k nearest nodes to X.