Yeah, this is the answer. To add to this, for the "large scale technologies" you're interested in, remember that there aren't many individuals that knows it al

Yeah, this is the answer. To add to this, for the "large scale technologies" you're interested in, remember that there aren't many individuals that knows it all (and neither will you!). Senior engineers and CTOs will have a rudimentary knowledge of a lot of the moving pieces, but it's primarily a team effort. Even if you "knew it all", you wouldn't have enough hours in the day to keep it all up to date and running. Running any larger piece of software is a team effort. But as a member of a team you'll still get a much better idea of all the pieces, even though you won't be able to master them all.