Frontend Master Interview Prep Series

A comprehensive, modular frontend interview preparation system for Mid to Senior level developers (3-6 years experience)

Transform your interview preparation with 1,020+ questions with detailed answers, 185+ coding problems with solutions, and 600+ flashcards covering the complete frontend ecosystem.

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📚 Table of Contents

• Quick Start
• What’s Inside
• Content Structure
• Study Paths
• Features
• How to Use
• Contributing
• License

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🚀 Quick Start

New to this repo? → Start here: GETTING-STARTED.md

Choose your path:

• 4-Week Sprint → Focus on essential topics + daily coding
• 12-Week Deep Dive → Master every topic comprehensively
• Interview Tomorrow? → Use Pre-Interview 30 Flashcards

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📦 What’s Inside

Core Topics (1,020+ Q&A)

Topic	Questions	Difficulty	Key Areas
JavaScript	200+	🟢 🟡 🔴	Core, Async, Engine, Modules
TypeScript	90+	🟡 🔴	Types, Generics, Advanced Patterns
React	150+	🟢 🟡 🔴	Hooks, Fiber, Performance
Next.js	80+	🟡 🔴	SSR, ISR, Server Components
HTML & CSS	110+	🟢 🟡	Semantics, Layouts, Animations
Testing	90+	🟡 🔴	Jest, RTL, E2E, Mocking
Performance	50+	🟡 🔴	Core Web Vitals, Optimization
Accessibility	40+	🟢 🟡	WCAG, ARIA, Keyboard Nav
Architecture	60+	🔴	System Design, Patterns
Security	50+	🟡 🔴	XSS, CSRF, Auth, HTTPS
Tooling	60+	🟡	Webpack, Vite, DevTools
SEO	40+	🟢 🟡	Meta Tags, Crawling, Structured Data

Coding Problems (185+)

Category	Problems	Companies	Topics
JavaScript Fundamentals	30+	All	debounce, throttle, memoize
DOM Manipulation	20+	Google, Meta	autocomplete, infinite scroll
React Problems	25+	All	custom hooks, components
Algorithms	30+	FAANG	LRU cache, trie, trees
UI Components	25+	All	star rating, modal, calculator
System Implementations	20+	Senior	event emitter, router, state mgmt
Company Questions	35+	FAANG	Real interview problems

Flashcards (600+)

Deck	Cards	Purpose	Time
Essential 50	50	Top interview questions	25 min
Pre-Interview 30	30	Last-minute review	15 min
Daily Review 20	20	Daily practice	10 min
JavaScript Master	100	JS deep dive	50 min
React Master	100	React mastery	50 min
Code Output Challenge	50	Tricky code snippets	25 min

Two formats:

• 📝 Markdown (read/edit easily in GitHub)
• 📱 Interactive Web App (track progress with spaced repetition)

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📂 Content Structure

Frontend-Master-Prep-Series/
├── 01-javascript/          200+ Q&A with answers + examples
├── 02-typescript/          90+ Q&A (NEW!)
├── 03-react/              150+ Q&A with detailed answers
├── 04-nextjs/             80+ Q&A covering App Router
├── 05-html-css/           110+ Q&A with visual examples
├── 06-testing/            90+ Q&A (NEW - Jest, RTL, E2E)
├── 07-performance/        50+ Q&A with optimization tips
├── 08-accessibility/      40+ Q&A (WCAG compliance)
├── 09-architecture/       60+ Q&A (system design)
├── 10-security/           50+ Q&A (NEW - vulnerabilities)
├── 11-tooling/            60+ Q&A (NEW - bundlers)
├── 12-seo/                40+ Q&A (crawling, indexing)
├── 13-coding-problems/    185+ problems with solutions
│   ├── 01-javascript-fundamentals/
│   ├── 02-dom-manipulation/
│   ├── 03-react-problems/
│   ├── 04-algorithms/
│   ├── 05-ui-components/
│   ├── 06-system-implementations/
│   └── 07-company-questions/
│       ├── google/
│       ├── meta/
│       ├── amazon/
│       ├── microsoft/
│       └── airbnb/
├── 14-flashcards/         600+ flashcards
│   ├── curated-decks/     Essential 50, Pre-Interview 30, Daily 20
│   ├── by-topic/          JavaScript, React, TypeScript, etc.
│   └── interactive-app/   Web-based flashcard viewer with progress tracking
├── resources/             Study guides, learning paths
└── diagrams/             Visual learning aids

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🎯 Study Paths

📖 View Complete Study Guides →

Includes: 4-week plan, 8-week plan, daily routines, interview checklist, and more!

Path 1: Quick Sprint (4 Weeks)

Goal: Interview-ready in one month

📘 Full 4-Week Study Plan - Complete day-by-day breakdown

Week	Focus	Time	Checklist
1	JavaScript fundamentals + TypeScript basics	10h	✅ Core concepts, async, closures
2	React + Hooks + Performance	12h	✅ Components, state, optimization
3	Next.js + Testing basics	10h	✅ SSR, ISR, Jest, RTL
4	Coding problems + Daily flashcards	15h	✅ 30 problems, Essential 50 deck

Total: ~47 hours over 4 weeks

Path 2: Deep Mastery (12 Weeks)

Goal: Complete mastery of frontend ecosystem

Weeks	Focus	Time	Outcome
1-4	JavaScript + TypeScript complete	30h	Master JS engine, async patterns
5-8	React + Next.js + Testing complete	35h	Expert-level component architecture
9-10	All coding problems	40h	Solve 185+ problems
11-12	Architecture + System design + Review	25h	Design scalable systems

Total: ~130 hours over 12 weeks

Path 3: Daily Practice

Goal: Consistent long-term improvement

• Morning (15 min): 20 new flashcards
• Evening (30-45 min): 1 coding problem + review flashcards
• Weekend (2-3 hours): Deep dive into 1 topic

Results: Mastery in 6 months with daily consistency

Interview Tomorrow?

📋 Pre-Interview Checklist - Everything you need to do before, during, and after your interview

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✨ Features

Every Question Includes:

• ✅ Detailed answer with multiple key points
• ✅ Working code examples with comments
• ✅ Common mistakes (❌ vs ✅)
• ✅ Follow-up questions interviewers ask
• ✅ Resource links (MDN, articles, videos)
• ✅ Difficulty level (🟢 Easy, 🟡 Medium, 🔴 Hard)
• ✅ Interview frequency (⭐ 1-5 stars)
• ✅ Company tags (Google, Meta, Amazon, etc.)
• ✅ Time to answer estimates

Every Coding Problem Includes:

• ✅ Clear problem statement
• ✅ Requirements checklist
• ✅ Example usage with test cases
• ✅ Multiple solutions (basic → optimized → production)
• ✅ Time/Space complexity analysis
• ✅ Common mistakes and edge cases
• ✅ Real-world applications
• ✅ Company-specific notes

Difficulty Distribution:

• 🟢 EASY (Fundamentals): ~300 questions (2-5 min)
• 🟡 MEDIUM (Intermediate): ~500 questions (5-10 min)
• 🔴 HARD (Advanced): ~220 questions (10-20 min)

Interview Frequency:

• ⭐⭐⭐⭐⭐ Very Common (80%+ interviews): ~150 questions
• ⭐⭐⭐⭐ Common (50%+ interviews): ~400 questions
• ⭐⭐⭐ Occasional (30%+ interviews): ~300 questions

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🎓 How to Use

For Interview Prep:

1. Assess your level: Start with Essential 50 flashcards
2. Identify weak areas: Focus on topics you struggle with
3. Follow a study path: Choose 4-week, 12-week, or daily practice
4. Practice coding: Solve 2-3 problems daily
5. Review flashcards: Use spaced repetition (Day 1, 3, 7, 14, 30)

For Learning:

1. Read Q&A sequentially: Go through one topic at a time
2. Run code examples: Copy-paste and experiment
3. Build projects: Apply concepts in real applications
4. Teach others: Best way to solidify knowledge

For Last-Minute Review:

1. Pre-Interview 30 flashcards (15 minutes before interview)
2. Skim Essential 50 (highlights of all topics)
3. Review company-specific questions (if interviewing at FAANG)

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🆕 What’s New in v2.0

This is a complete restructuring from the original single README:

Added:

• ✅ Comprehensive answers to every question (1,020+)
• ✅ TypeScript section (90+ Q&A) - critical addition
• ✅ Testing section (90+ Q&A) - Jest, RTL, E2E
• ✅ Security section (50+ Q&A) - XSS, CSRF, auth
• ✅ Tooling section (60+ Q&A) - Webpack, Vite
• ✅ Coding problems (185+ with solutions)
• ✅ Flashcard system (600+ cards with spaced repetition)
• ✅ Interactive flashcard web app (progress tracking)
• ✅ Learning resources (study paths, guides)

Improved:

• 🔄 Modular structure (14 directories, 149+ files)
• 🔄 Fast navigation (find any topic in <10 seconds)
• 🔄 Company-specific questions (Google, Meta, Amazon)
• 🔄 Difficulty ratings and time estimates
• 🔄 Visual learning aids (diagrams)

v1.0.0: 650+ questions, no answers, single file v2.0.0: 1,020+ Q&A + 185+ problems + 600+ flashcards, modular

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🤝 Contributing

We welcome contributions! See CONTRIBUTING.md for guidelines.

Ways to contribute:

• Add new questions/answers
• Submit coding problems
• Fix typos or improve explanations
• Create new flashcard decks
• Add diagrams or visual aids
• Share interview experiences

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📊 Progress Tracking

Track your progress:

• Completed JavaScript (200+ questions)
• Completed TypeScript (90+ questions)
• Completed React (150+ questions)
• Completed Next.js (80+ questions)
• Completed HTML/CSS (110+ questions)
• Completed Testing (90+ questions)
• Solved 50+ coding problems
• Solved 100+ coding problems
• Solved 150+ coding problems
• Reviewed Essential 50 flashcards
• Reviewed all topic flashcards
• Interview-ready!

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📈 Repository Stats

• Total Q&A: 1,020+
• Coding Problems: 185+
• Flashcards: 600+
• Topics Covered: 12 major areas
• Companies Represented: Google, Meta, Amazon, Microsoft, Airbnb, and more
• Estimated Study Time: 47h (quick) to 130h (deep)
• Files: 149+ markdown files
• Last Updated: November 2025

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📄 License

MIT License - Open source for learning and contribution.

See LICENSE for details.

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📞 Connect

Author: Sachin Maurya Focus: UI / Frontend / React / Next.js Engineer Goal: Help developers master frontend interviews

Found this helpful? Share it with your network!

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Happy Learning! 🚀

Last updated: November 2025 | v2.0.0 | 1,020+ Q&A | 185+ Problems | 600+ Flashcards