> What is it that you FAANG developers do that is so much more complex than what regular developers do?
A meager defense follows. I've worked both "midwest design shop" and FAANG-adjacent jobs, from junior to staff to manager.
The main thing is supply and demand. The supply of engineers willing to work at a FAANG, in a region that FAANG is willing & able to support, and are willing and able to go through the technical hazing process called a "hiring panel," is very much short of demand. On the other side, profits per employee are phenomenal at scale, so making hires at these rates still makes sense financially.
But to answer your real question: it's less about the complexity of the code on a day to day basis, and more about the complexity of the system you have to work within, both technical and political, and the expectations of scale. A microservice system has both network and political boundaries to work through, whether making changes or RPC calls.
Then, while a small scale system might see a one-in-a-million event once per year, a large system will see it many times per hour, or even per minute. Managing simple things like changes to a database becomes a multi-step process, involving tools and stakeholders, instead of just a quick 2 minutes of scheduled downtime. Engineers need to be capable of thinking through those sorts of things. Stuff gets real weird at scale.
As a result, of both the above, engineers frequently find themselves doing highly specialized work, which is even harder to hire for. The guy who knows scaling properties of Postgres inside and out hasn't written production web code in a decade; his skills are almost worthless outside of FAANG-scale problems. Amazon has folks working for years on all sorts of niche network optimizations, because microseconds matter to them, but good luck transferring those skills back to fullstack web dev.
Last, a not insignificant number of engineers at FAANG are doing fantastically easy work on the same pay scale. Someone has to manage the wordpress (or whatever) installation for the docs site, or some backend process written in Django just for six important people. They often still get an engineer title and pay scale. So, it frequently is harder, but certainly not always.