“most engineers are capable of writing bug-free code. it’s just that they don’t have an incentive to do so at most companies. when there’s a QA department, it’s easy to just throw it over to them to find the errors.”

Bull. Shit. This one line makes me think that this entire post is completely hear-say. A 500 person engineering team that writes bug-free code on a system as a large as facebook? Give me a break.