This book is your complete roadmap to acing React.js 19 interviews — from junior-level questions to mid-level mastery. Whether you’re just starting out or preparing for your next big opportunity, this guide is built for you.
Get it now for just $20 (original price $30)
Based on 350+ real-world front-end interviews, it delivers the most relevant technical questions asked by top companies — along with clear, practical answers that help you build confidence, deepen your React.js knowledge, and prove your skills where it matters most.
🔍 What’s Inside?
Core React Concepts — JSX, Virtual DOM, props, state, and component structure (React.js v19)
Hooks Deep Dive — useState, useEffect, useReducer, useRef, useMemo, and more (React.js v19)
Performance Optimization — Avoid re-renders, lazy loading, memoization, and profiling (React.js v19)
Component Design & Reusability — HOCs, render props, children, and Fragments (React.js v19)
Forms & Event Handling — Controlled/uncontrolled components, validation, synthetic events (React.js v19)
Styling Techniques — CSS Modules, Tailwind CSS (v4.0), clsx (v2.1), and scalable styling strategies
Routing — Nested routes, useParams, useSearchParams, and route protection (React Router v7.4)
Error Handling — Error boundaries, debugging practices, graceful fallbacks (React.js v19)
Global State Management — Context API (React 19), Redux Toolkit (v2.6), Zustand (v5.0), and best practices
Who This Book Is For
Junior Developers — Build a strong foundation and get interview-ready
Intermediate Developers — Deepen your skills and prepare for more challenging interviews
Mentors — Help your mentees go further, faster
Why I Wrote This
I’ve personally conducted 350+ React.js interviews as a front-end technical lead. I’ve seen where developers struggle and what separates successful candidates from the rest.
This book is built from that real experience, with no fluff, no copy-paste from docs, and no outdated patterns.
Just practical, clear, and modern content — designed to help you stand out.
Check out the sample of my book:
If you’ve ever felt overwhelmed by vague interview questions or unsure of how to explain core React concepts — you’re not alone. This book is for you.
Thank you to everyone who supported me during this process. Your feedback, encouragement, and belief made this possible. 🙏
Let me know what you think of the book, and feel free to share it with someone who’s preparing for their next React.js role!
© 2025 Kristiyan Velkov. All rights reserved.
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