Deep internals, concurrent features, React Server Components, advanced patterns, and production-grade state management — everything you need to build React applications that are fast, correct, and maintainable at scale.
This course takes you past the React API surface into the mechanics that govern how React actually works: the fiber reconciler, the rules and mental model of hooks, concurrent rendering and the Scheduler, and React Server Components. You will learn the component patterns used by serious UI libraries (compound components, polymorphic components, render props, HOCs), master the state management landscape (TanStack Query for server state, Zustand and Jotai for client state, useSyncExternalStore for external stores), and apply production engineering practices including error boundaries, accessibility, bundle splitting, feature flags, and component testing with React Testing Library and Mock Service Worker. By the end, you will be equipped to make principled architecture decisions — choosing the right state layer, the right component API, and the right rendering model — rather than following patterns by rote.
Built by Lakshya Kumar
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I am learning advanced React concepts — hooks internals, concurrent features, React Server Components, performance optimization, and state management patterns. Help me understand the deep 'why' behind React's design decisions, not just the API surface.
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Sign in to applyComplete all modules, then submit the required number of capstone projects. Each must earn a passing rating from an admin reviewer.
Build a production-ready full-stack React application using React Server Components for data fetching, client components for interactivity, TanStack Query for optimistic mutations, and Zustand for UI state. The app must have error boundaries on every route, be fully keyboard-accessible (zero critical axe-core violations), have a main bundle under 200KB gzipped, and include component tests for the three most critical user flows.
Build a Next.js App Router project using React Server Components: streaming UI with Suspense, parallel data loading at the route level, error boundaries, and a measurement that shows TTFB and LCP under real network throttling. Include cache-tag invalidation flow.
Build a 4-step wizard form (10+ fields per step) with React Hook Form + Zod validation, dynamic dependent fields, server-side validation merged with client errors, abandon-and-resume state persisted to localStorage, and full keyboard navigation. Cover accessibility (WCAG AA) in tests.
Take a real (or example) React app with measurable jank and produce a profiling report: React DevTools profiler runs, identified re-render hotspots, three concrete optimizations applied (memo, virtualization, code split), and a before/after benchmark showing FCP and INP improvements.
Build a non-trivial UI flow (checkout, multi-step onboarding) using XState: visualized state machine, deterministic transitions, persistence + restoration, and a test suite that exercises every transition. Include the state diagram in your repo's README.