Crack It with Me: Topic-Wise Interview Prep with Sachin Gupta

Preparing for a frontend or fullstack interview? Don't waste hours searching scattered YouTube videos or inconsistent blogs. I’ve created a structured, topic-wise digital guide with code, explanations, and examples — exactly how I prepare my mentees.

Whether you’re targeting MAANG, product startups, or freelance gigs, this content helps you build real confidence.

🧠 What’s Inside? (Each topic is explained clearly, with examples, interview patterns, and pitfalls)

🔸 JavaScript Core Topics

• Variables, Hoisting, Scope, Closures
• Event Loop, Callback vs Promise vs Async/Await
• Array/Object manipulation deep dive
• this, bind/call/apply, currying
• WeakMap/Set, Garbage collection, deep vs shallow copy

🔸 React & Next.js

• Component design patterns (Smart/Dumb)
• Hooks: useEffect, useMemo, useCallback best practices
• Context API vs Redux vs Zustand
• Folder structure for scalable apps
• Performance optimization (code splitting, lazy loading)

🔸 TypeScript for Interviews

• Types vs Interfaces, Utility Types
• Safe API typing, form validation
• React + TS patterns, Discriminated unions

🔸 System Design for Frontend

• Design a scalable dashboard
• Chat, Notification, Realtime apps (WebSockets)
• CDN, SSR/CSR, caching layers explained
• Folder + feature architecture

🔸 Testing & Debugging

• React Testing Library with examples
• Common interview questions for testing
• Performance profiling tips

🔸 Bonus:

• Resume + GitHub structure for visibility
• HR + Tech screening checklist
• Top 50 frontend interview questions (with expected answer patterns)