React

The App Router and React Server Components are not just new APIs; they change where your code runs. Here is how they cut bundle size, simplified data fetching, and made my pages measurably faster.

The questions I actually ask in frontend interviews, and what I am listening for in each answer — from layout behaviour to how a candidate handles a broken build.

The mental model behind the server/client boundary in modern React, with concrete examples of what belongs on each side — and what the next.js app router actually compiles.