Phone Interview : As mentioned by many, nothing much different Onsite Interview : Included 3 white boards + 1 behavioral Many people have commented that onsite interview for FB DE has Product sense, SQL , and Python. However, for me, the focus was majorly on Data Structures and Algorithms, and then Product Sense. All the 3 areas that are focus of the interview, all has equal probability to be asked in-depth. So , don't ignore DS Algorithms. There are few hypothetical questions, but those are for the end, if one complete the DS Algorithms questions first. I was not asked any SQL questions.