It's also noteworthy that at least some FANGs value engineers who are jacks of all trades and in general make it virtually impossible to specialize on topics, a

It's also noteworthy that at least some FANGs value engineers who are jacks of all trades and in general make it virtually impossible to specialize on topics, and whose average tenure hits around 3-4 years. This contrasts profoundly with the job requirements posted by your run-of-the-mill recruiter, who looks for years and years of specialization on specific tech stacks.