A2ZFrontend
Senior frontend prep — language depth, platform craft, and system design in one structured track.
No scattered prep. Choose a module below and go deep.
Explore topics
Guide modules in prep order — MDX guides plus Machine Coding on the platform.
| # | Module | Interview focus | Topics | |
|---|---|---|---|---|
| 01 | The floor for every round—closures, event loop, async, utilities, and patterns panels still drill. Event loop & closuresPolyfills & patterns | The floor for every round—closures, event loop, async, utilities, and patterns panels still drill. Event loop & closuresPolyfills & patterns | 26 | Open guide |
| 02 | Types you defend in a staff loop—generics, strict mode, unions, and type-safe API design. Generics & utility typesConditional & mapped types | Types you defend in a staff loop—generics, strict mode, unions, and type-safe API design. Generics & utility typesConditional & mapped types | 15 | Open guide |
| 03 | Hooks, Fiber, render perf, and state trade-offs—beyond todo-app answers. Reconciliation & hooksZustand vs React Query | Hooks, Fiber, render perf, and state trade-offs—beyond todo-app answers. Reconciliation & hooksZustand vs React Query | 15 | Open guide |
| 04 | SSR modes, App Router, streaming, caching—ship React and explain why. SSR / SSG / ISRServer Actions & cache | SSR modes, App Router, streaming, caching—ship React and explain why. SSR / SSG / ISRServer Actions & cache | 10 | Open guide |
| 05 | URL → pixel, V8, networking, Core Web Vitals—senior “what happens when…” rounds. Rendering pipelineLCP, INP, CLS | URL → pixel, V8, networking, Core Web Vitals—senior “what happens when…” rounds. Rendering pipelineLCP, INP, CLS | 12 | Open guide |
| 06 | XSS, CSRF, token storage, OAuth PKCE—gaps that fail otherwise strong candidates. XSS & CSRFAuth in SPAs | XSS, CSRF, token storage, OAuth PKCE—gaps that fail otherwise strong candidates. XSS & CSRFAuth in SPAs | 6 | Open guide |
| 07 | Bundlers, ESM, monorepos, feature flags—how top teams ship and scale frontends. Vite vs WebpackPlatform & observability | Bundlers, ESM, monorepos, feature flags—how top teams ship and scale frontends. Vite vs WebpackPlatform & observability | 13 | Open guide |
| 08 | Machine CodingNavbar · Machine Coding 45-minute UI builds—tabs, virtual lists, autocomplete—clean code under clock pressure in the live editor. In-browser editorAutomated tests | 45-minute UI builds—tabs, virtual lists, autocomplete—clean code under clock pressure in the live editor. In-browser editorAutomated tests | 105 | Open Machine Coding |
| 09 | Core 5 FSD interviews—autocomplete, news feed, e-commerce, real-time chat, collaborative editor. Real interviewer promptsHLD / LLD walkthroughs | Core 5 FSD interviews—autocomplete, news feed, e-commerce, real-time chat, collaborative editor. Real interviewer promptsHLD / LLD walkthroughs | 5 | Open guide |
102 guide topics · 105+ machine coding
Every topic page includes
- The exact interview question from the sheet
- Structured guide with concept breakdown
- Panel-ready solution you can defend live
- Follow-ups interviewers ask next