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JavaScript · React · Next.js · HTML & CSS · System design
A focused checklist for mid- to senior-level frontend roles. Answer each question out loud first, then reveal the model answer to check yourself. Tick it off once you can explain it with confidence, or star it to come back to later.
Closures, the event loop, this, promises, prototypes, plus coding problems and polyfills you can run and test in the browser.
Types vs interfaces, any vs unknown, utility types and typing React components.
Core concepts, hooks, Redux, performance and data fetching, plus machine coding questions with a live preview.
Rendering strategies, hydration, the App Router, routing, API routes and SEO.
Frontend architecture, microfrontends, debugging at scale, and questions about your projects and how you work.
Semantic HTML, accessibility, the cascade, Flexbox and Grid, and responsive design, plus layout challenges with a live preview.