Deep JavaScript/TypeScript Mastery
Challenge: Understand advanced concepts like closures, prototypal inheritance, event loop, and memory management.
Solution:
Build projects using design patterns (Factory, Observer, Singleton).
Learn TypeScript generics, decorators, and utility types.
Example: Create a custom state management library.
React Advanced Patterns
Challenge: Optimize performance and manage complex state.
Solution:
Master hooks (useMemo, useCallback, useReducer).
Implement compound components, render props, and controlled/uncontrolled components.
Example: Build a high-performance data table with virtualization.
State Management at Scale
Challenge: Choose between Redux, Context API, Zustand, or React Query.
Solution:
Compare trade-offs (boilerplate, scalability, dev tools).
Example: Migrate a legacy Redux app to Zustand + React Query.
Performance Optimization
Challenge: Fix lazy loading, bundle splitting, and re-renders.
Solution:
Use React.memo, React.lazy, and Webpack code splitting.
Audit apps with Lighthouse and Chrome DevTools.
Example: Reduce a 5MB bundle to under 1MB.
Testing & Debugging
Challenge: Write maintainable tests and debug efficiently.
Solution:
Cover integration tests with Cypress and unit tests with Jest.
Debug memory leaks with Chrome Heap Snapshots.
Example: Achieve 80%+ test coverage for a Next.js app.
CSS Architecture
Challenge: Scale CSS in large apps (BEM, CSS-in-JS, Tailwind).
Solution:
Compare CSS Modules vs. Styled Components.
Implement design systems with Storybook.
Example: Build a themable UI library.
SSR/SSG (Next.js, Remix)
Challenge: Optimize SEO and server-side rendering.
Solution:
Master Next.js getServerSideProps/getStaticProps.
Example: Deploy a Next.js app with ISR (Incremental Static Regeneration).
Web Security
Challenge: Prevent XSS, CSRF, and data leaks.
Solution:
Sanitize inputs with DOMPurify.
Implement CSP headers.
Example: Secure a login form with JWT and HTTP-only cookies.
CI/CD & DevOps Basics
Challenge: Automate deployments and testing.
Solution:
Set up GitHub Actions for automated testing.
Configure Docker for frontend apps.
Example: Deploy a React app to AWS S3 with GitHub Actions.
Soft Skills
Challenge: Lead projects and mentor juniors.
Solution:
Practice giving code reviews and writing RFCs.
Example: Document a technical decision (e.g., “Why we chose Vite over CRA”).
Bonus: System Design
Challenge: Architect a frontend monorepo.
Solution:
Learn TurboRepo or Nx.
Example: Split a monolithic app into micro-frontends