I interviewed with Facebook position Data Engineer for Singapore office. The whole process took 4 weeks, mainly for waiting for the result. It took me 2.5 weeks just to receive the Thanks but no thanks email! Technical bar for this position is very low, questions are easy especially on SQL. However, they are looking for a person also can work with BI team so there are some requirements on the non-technical side, e.g product sense. Do prepare to be interviewed by "manager" people who doesnt asset based on technical skills but your manner and personality. I was quite surprised when one of them asked me why I have 8 years of experience but already worked for 7 companies. It is teally offensive and I couldnt believe a company like Facebook asked me that question! In general, it as a bad experience for me, especially the waiting part!