> technical interviews that allow me to better understand the Twitter tech stack
And the stack is basically a very fancy CRUD app. That's all Twitter is. The only reason it's still operating is because of the premise: Create, Read, Update, Delete. NO magic sauce.
Have you ever done CRUD for hundreds of millions of users distributed globally accessing your service 24/7? It's much more complicated than updating a database.
Then you have ranking algorithms, search, ad serving, moderation...
And the stack is basically a very fancy CRUD app. That's all Twitter is. The only reason it's still operating is because of the premise: Create, Read, Update, Delete. NO magic sauce.