Meta Software Engineer interview questions

Applied online. Got an email from a recruiter. Easy,efficient and painless process. The recruiters are really quick and will let you know the smallest of details regarding the interview. Had a technical phone screen with an engineer from a similar team. Had to code on collabedit. Was initially asked some OOP concepts,Data structure questions. The coding question was easy and i solved it correctly albeit a few corrections here and there. The code ran in O(n) with no space so i thought i did good. Question was find if one string is one edit distance away from the other string. This is the same as minimum edit distance question but with a twist. In this case you just want to know if its one edit away or not. The interviewer asked me if there was anything i could improve in the code, at that moment i did not think there could be any improvement other than some validation checks/readability of code. After the call i realized there was a small 5 line solution to this involving recursion but alas.

First I got a phone interview, where I was asked a few background questions like previous experience. After this, I received an email for an on-site interview. After a brief tour of the campus in Palo Alto, I was brought to a room where a Senior Software Engineer interviewed me. I was asked a number of simple questions, and then one complex coding question.