Microsoft Frontend Engineer Interview Questions

I would measure where the time goes first, then optimize the biggest bottleneck rather than guessing. Typical fixes include reducing bundle size, code splitting, lazy loading noncritical assets, compressing images, and deferring unnecessary work.

Client-side rendering builds most of the UI in the browser, while server-side rendering sends prebuilt HTML from the server. SSR can improve first contentful render and SEO, while client-side rendering can simplify interactivity after the app loads.

I would design explicit loading, error, and empty states so the user always knows what is happening. I would also add retry behavior where appropriate, surface actionable messages, and avoid breaking the entire screen for one failed request.

Hydration is the process of attaching client-side behavior to server-rendered HTML so the page becomes interactive. The key challenge is keeping server and client output consistent to avoid mismatches.

I would structure the form into logical sections, keep validation rules close to the schema, and avoid making every keystroke expensive. For complex forms, I would separate field-level state from submission state and provide clear inline feedback.