Meta Software Engineer interview questions

Applied through University, they asked for my availability to schedule a technical telephonic interview. Towards the end of the interview I was given opportunity to ask questions from the interviewer. Got response after 2 days. The interviewer was polite and explained the question in detail.

First I applied for a Software Engineer Intern position, passed the first video interview and my recruiter proposed me to try the Grad position. Then they invited me on 3 onsite interviews at the London office. The trip was organized at a really high level. Travel team works perfectly. The overall atmosphere was nice and comfortable, the office is great. Unfortunately, I was refused.