There's this very widespread misconception about Netflix being a monolithic service running on Amazons' cloud infrastructure, even though the truth is that just the "rather boring" routine stuff like billing, view history tracking, suggestions, everything necessary to show the UI is running there. Netflix does a good job at this, but after all it's not that impressive when you've architected some distributed systems yourself. Not even their extreme take on the microservices concept - that is after all just a nice way of letting their devs do "their thing" in the way they want with as little restrictions from the environment as possible (which basically only works because they clearly have above-average-competence devs who can deal with these degrees of freedom).
What's really crazy is the way they squeeze unimaginable amounts of bytes per second out of modern hardware and into the internet infrastructure. They saturate 100Gbit links that usually serve an aggregation of many boxes in a datacenter with just ONE box! This is way beyond what even most above-average devs are capable of doing - you NEED old-school guys which still managed to stay on top of the crazy stack created by the evolution of hardware and low-level software in the last decade. There's not many of those out there, and Netflix apparently managed to catch a good bunch of them. These guys do the magic, and the magic they do never touches that damn Amazon Cloud. It just floats way above it.