You don’t comprehend what actually happens inside of AWS. 99.999% of the job is dealing with ancient proprietary Amazon systems that were designed a decade or two ago, and have an unbelievable amount of warts and sharp edges. And you’re not allowed to use any newer tools, because Amazon invented “Not Invented Here” a couple of decades before anyone else in the world ever heard of that term.

Yes, they make use of some open-source products as the core of some of the software and services they provide. But as an internal AWS employee, you’re not allowed to use anything but Tier-1 products as components to your software or service, if you use any AWS products or services at all.

This way you don’t have Tier-1 services dependent on Tier-2 or higher services. Priority inversions are avoided at all costs.

But then you still have all the control planes for all of these services which are so heavily dependent on US-East-1. And if US-East-1 goes down, then the data plane has to continue trying to function blindly, because the control plane doesn’t exist anymore. They’re still working on trying to fix that problem.

Open source software, or any software not designed and developed by Amazon/AWS, is no more than 0.001% of the job — if that much.