[hashseed]

There is a lot of content on V8's dev blog, with different depth, all pretty well written: https://v8.dev/blog

[khalilravanna]

For sure the blog is great! But I’m thinking something more along the lines of “here’s how you’d build something like this” or “here’s the stuff to read to get started on a project like this”.

[saagarjha]

JIT engineers are mostly oddly specialized compiler engineers, so you're really looking at learning how optimizing compilers work as a prerequisite.