I have a question: why companies like Twitter need so many people? I'm sorry but it doesn't seem that hard to replicated Twitter functionality and scalability (with the right people on team). What are the engineers actually doing the whole day? Why do they need so many lines of code? All mysterious to me.
How are you detecting human trafficing and reporting it (FOSTA-SESTA)?
How are you detecting CSAM and reporting offenders to NCMEC?
How are you detecting and removing spam? How are you preventing fraudulent ad clicks? How do you deal with "whale" accounts (very large follower counts) and returning an algorithmic feed for their followers?
I interviewed for their deveng team and they were doing things like build-caches because it sped up compiles and increased productivity. Also optimising the Scala compiler (more productivity gains).