Meta Software Developer interview questions

Facebook recruiter got in touch with me. Had a phone conversation with her. She setup a phone screen within a week. Used Collabedit for coding. Two questions. Got a reply back within a week. Setup on site for the next week. 1 behavioral, lunch, 2 coding, 1 system design. The questions I got were weren't super difficult except for the system design question (how will you design the social graph with class, interfaces, etc). Other questions were, implement Pow, convert from decimal to roman and vice versa, binary tree serialization and deserialization, implement concurrent read/write buffer. For the system design question, the interviewer was very helpful and provided hints when I got stuck.

Firstly, I applied for FB position online and then an HR contacted me to appoint a time to chat. The chat with HR including: 1. What the basic interview process. 2. What the basic hiring process if get offer 3. Free chat to understand my background Then one day later I received mail to determine a skype screen date. The interview through skype 1. firstly self introduction and ice breaker. 2. 2 coding execises The execises is similar with that in leetcode that of easy/medium level