I was contacted by a FB recruiter on LinkedIn. I wasn't looking but thought I will try anyway - worst case it will be good feedback on where I am. I passed the phone screening, then was scheduled to have a 1:1 interview. I thought it went well, it wasn't too easy, but it wasn't too hard either. I was told that I'll get an email with a decision within the next few days. Then I have waited and waited. Nothing. I have written 4 follow up emails within 4 weeks by the time I got an answer from the recruiter, saying they were not moving forward with me, and that I should have gotten an email and I probably missed it. I'm fine with rejection, I think there's no shame in not getting into one of the top tech companies your first try, but I was very disappointed how they handled it... no feedback, 4 weeks of continuous emails to get an answer, and then accusing me of not paying attention to my inbox... oh, and my application is still active in their recruitment portal. I was expecting more from you, Facebook. I'm sorry to have been disappointed.

It kicked off with an initial phone screen that jumped straight into technical questions, so you really have to be warmed up—especially on A/B testing: framing the hypothesis, picking primary metrics and guardrails, walking through power/MDE, exposure and unit of randomization.