> Applying for senior engineering positions (>E4) in FANG companies is one of the best ways to get into them.
This comment by a veteran senior engineer confirms to me that Facebook, just like most other FANGs, does a poor job of promoting from within.
There are multiple comments to the same effect from many other FANG employees: It's much easier to get recruited for senior roles from the outside, then get promoted from the inside.
The result of this failure is that job-hopping is the most valid career strategy for aspiring seniors.