Ya, I don't have too much in terms of insidery baseball. But I did have some colleagues at MLB in nyc. I recall it was pretty much a Java shop. With Akami providing extensive CDN support.

If one is interested in rolling one's own clone of Netflix. there isn't really a tutorial or course to watch to learn how its done. And there very much should be.

The closest you can get is probably Dave Hahn's Day in the Life of a Netflix Engineer series from AWS re:Invent

https://www.youtube.com/watch?v=T_D1G42G0dE