Netflix is, mostly, just a Java shop. They follow good practices in a lot of ways (circuit-breaker patterns, abstracted access to data stores, etc.) but it's still a Java shop.

Their infrastructural/cloud ops teams are broader in the proper nouns they wrangle, but that's a different kettle of fish and is totally learnable outside of Netflix: understand AWS (when to build versus buy), understand how systems talk to one another (networking, HTTP for online queries versus queues for offline jobs), and how systems scale and repair after failure (horizontal versus vertical scaling, quorums for decisionmaking, when to use CP versus AP datastores, that kind of thing). And Netflix open-sources enough of their internal tooling that, once you have a baseline in the infrastructural field, you can probably do a good job of figuring out what the missing bits are.

I'm sure, having not worked there but worked on fairly large systems, that Netflix has its own wacky problems, but they're the things that baseline understanding of this stuff enables you to learn. It's all just digital plumbing.