Meta Software Engineer interview questions

applied online as a software engineer. got an email from a recruiter after a couple of weeks. got explanation about the process. (2 phone interviews + 4 interviews (on-site)) heard the interviews would be mostly about programming. during the interview, got asked to program some typical programming questions. even though the questions were not that hard, failed to write the code cleanly/quickly enough. got rejected just a couple of hours later.

The recruiter asked me if I would like to do a phone screen or go to the Facebook office and have a face to face interview. I chose the latter. I went there on time. They had asked me to bring the signed copy of the NDA which I did. I spoke to the recruiting coordinator and the interview with the engineer lasted about 45 minutes. The interviewer had another interviewer shadow him but only the main interviewer interacted with me.