Earlier quoted context omitted.
>Being a senior engineer at Facebook where your responsible for making sure Cat memes load more quickly, this strikes me as an unnecessarily rude dismissal of the difficulty of engineering at scale this might sound crazy, but some people are actually just good at their jobs and will, naturally, progress quicker than others.
I interpreted that more as a difference in the potential problems you may cause rather than the skills required, as GP referred to "responsibility". If FB goes down, people waste less time online[0], if a guidance system fails people may die. [0] yes, of course there are people whose livelihood depends on cat memes, but I'm making a generic example.
Goes down yes, but what about a data breach? What if, for example, the location of a woman is mistakenly exposed to a abusive partner?
In my view the distinction between a senior software engineer and not is the ability to see how both human and software systems interact and find failure modes that others may miss.