I applied through a recruiter who contacted me in September. She was nice and we booked a Phone/Screen coding interview. They are using CoderPad for these. This first interview consisted of 3 questions, they all seemed pretty easy and then the interviewer asked for edge cases, a bit more challenging but nothing impossible. The interviewer was really nice and encouraging. After that, I had another Phone/Screen interview which was basically the same. There was a basic question which was to code an observer pattern. It wasn't too hard but much more challenging than the first one, especially when the interviewer ask about some edge cases. Again the interviewer was really nice and encouraging and giving you clues when he saw I was blocked. I finally got to the last step, the onsite interview, and it was a bit different in my opinion. First, the process took a lot of time, I had a chat with a recruiter but I didn't know if I would have the interview in London or in Menlo Park. It took almost a month before I had the interview organised. I finally flew from London to Menlo Park for the onsite interview, the organisation was pretty easy though, everything is arranged by Facebook, I flew 2 days before the interview and returned the evening after the interview. The onsite interview consisted of 4x45 min interview, 2 coding interviews on a whiteboard, 1 conversation interview and 1 architecture interview. I felt like one of the coding interview was much harder than any other interview I had with Facebook and it was also much harder to get things right on a whiteboard, and I was absolutely terrible at this one. The other coding interview was more like the phone/screen interview, not too hard but a bit more challenging when I got to the edge cases, it made me wonder if I've just been very unlucky for the first coding interviews that I had a much harder one, but well that's part of the game. I can see that people were asked to code the array flatten in a iterative and recursive way for the first phone/screen interview, but I did it in a recursive way only, so I guess I got lucky in other interviews. In those interviews you will be mostly asked algorithms questions: iterative and recursive patterns, complexity (big O notation) and data structures. Don't hesitate to ask questions and to talk about the problem before even starting to code, that's very important especially that on a white board it's much harder to amend code (you can't copy paste or add line breaks everywhere), it's very important to know what you're going to do before writing anything, rather than writing as you think, like I did. Also the interviewers were very nice and encouraging even though I was terrible, they kept giving me clues and ways to think. I also was super stressed and slept around 3h the night before because of the jetlag, which didn't help. Besides those coding interviews that were the challenging part for me, the conversation interview was more about getting to know me and classic interview questions (Why Facebook? Why Front End? Tell about a project you had and how you solved it? Tell about a conflict you had at work and how you dealt with it?), for this one the recruiter told me about all these questions before so I had everything prepared. The architecture interview was more about how you would approach a front end problem and how you would structure your code, whether it's about HTML, CSS or Javascript. This one didn't seem to be too hard, if you have enough experience with layouts and front end issues, it shouldn't be fine. After that one, I came back to London in the evening, a recruiter called me on Skype 2 days later and told me the team didn't want to go forward. I was kind of expecting it since I haven't been good in the coding interviews, still I was very disappointed and frustrated that I went all the way to Menlo Park, visited the Facebook HQ and that I eventually failed... But still the recruiter was very nice and keen to give me any feedback, I was just so disappointed that I didn't ask anything. In the end I'd say it was a very positive experience, all the people I've been in touch with were very kind and encouraging, the interviews seemed reasonable and looked like things I should be able to solve if I was a top coder. I have to wait more than 1 year to try again and I might do it, I hope I can have the onsite interview in London this time.