Is Object-Oriented Design Interview: An Insider’s Guide Book Worth it in 2026?

Hello folks, If you’re gearing up for coding and design interviews in 2025, I’ve got something valuable to share. The Object-Oriented Design Interview: An Insider’s Guide by Alex Xu and ByteByteGo has just hit the shelves, and it’s already creating a buzz in the tech interview prep space.  In this post, I’ll break down what’s inside this book, why it’s different, and why I believe it’s a must-read for software engineers preparing for interviews at top companies.  Let’s dive in.

Why Object-Oriented Design Matters in Interviews?

Before we get into the book itself, let’s talk about why object-oriented design (OOD) skills are so critical in today’s software engineering interviews.

When you’re interviewing at companies like Google, Amazon, Meta, or any product-based firm, you’ll notice that system design and object-oriented design questions form a significant chunk of the interview rounds.

Why? Because writing clean, scalable, and maintainable code isn’t just about knowing syntax or solving algorithms. It’s about designing systems that can grow, adapt, and stay robust under pressure.

Object-oriented design interviews test how you structure your code, break down complex requirements, model real-world entities, and think through edge cases.

A solid grasp of OOD shows that you can handle large-scale software development — not just coding puzzles.

About the Authors: Alex Xu and ByteByteGo

If you’ve prepped for system design interviews before, chances are you’ve heard of Alex Xu. He’s the author behind System Design Interview: An Insider’s Guide, volumes 1 and 2 — books that many engineers swear by.

ByteByteGo, the platform co-founded by Xu, is dedicated to simplifying complex tech concepts with clean visuals and explanations.

Together, they’ve released several bestsellers, including:

• System Design Interview — An Insider’s Guide
• System Design Interview — Volume 2
• Machine Learning System Design Interview
• Coding Interview Patterns
• Generative AI System Design Interview

Their new book, Object-Oriented Design Interview, follows the same philosophy: simplify, explain, and make it actionable.

A good thing is that now you can read all of their books in ByteByteGo, one single place as they have now added all of their books into this platform.

What’s Inside the Book? A Closer Look

This book isn’t just another collection of practice questions. It’s a guided tour of what OOD interviews are really about. Let’s break down its key features:

An Insider’s Framework

The book introduces a simple yet powerful 4-step framework for tackling any OOD interview question:

1. Understand the problem and clarify requirements.
2. Identify the core objects and relationships.
3. Design the interactions between objects.
4. Refine the design and consider edge cases.

This structure gives you a repeatable way to approach design questions, rather than fumbling through with ad-hoc solutions.

11 Real OOD Interview Problems

The book covers practical, frequently asked questions. Some examples:

• Parking Lot System
• Movie Ticket Booking System
• Vending Machine System
• Elevator System
• ATM (Automated Teller Machine)
• Restaurant Management System
• Shipping Locker System
• Tic-Tac-Toe and Blackjack (game design questions that often trip up candidates)

For each, you get a full walkthrough of the design process, trade-offs considered, and clean diagrams that show how it all fits together.

133 Diagrams

ByteByteGo’s strength has always been their visuals. This book includes over 130 detailed diagrams to illustrate architectures, class relationships, workflows, and more.

These aren’t just pretty pictures — they help you really see the design, which is critical in OOD.

Here is one such diagram about OOP Design patterns to give you an idea of what to expect

Strong Focus on Fundamentals

One of the first chapters is a no-nonsense recap of object-oriented programming principles: abstraction, encapsulation, inheritance, and polymorphism.

These are the building blocks that you’ll apply again and again in interview scenarios.

Here are 8 key OOP Concepts every developer should learn from ByteByteGo

Who Should Read This Book?

If you’re:

• Preparing for software engineering interviews (especially at product-based companies),
• Brushing up on system and object design before moving to a senior role,
• Looking to move beyond just coding problems to larger design challenges,

then this book is for you.

It doesn’t assume you’re an expert designer already. In fact, if you’ve ever felt overwhelmed by OOD questions, this book helps you break them down into manageable parts.

 

How Does It Compare to Other Resources?

There are plenty of interview prep books out there. What sets Object-Oriented Design Interview apart is its blend of clarity, practicality, and focus on how to think.

Many books either:

• Stay too theoretical, or
• Give solutions without showing the thinking process.

This one strikes the right balance. It’s less about memorizing patterns and more about learning to reason like a designer — which is what interviewers actually want to see.

And of course, those diagrams make a big difference.

Here is the link to get this book — Object-Oriented Design Interview

The print edition is already live on Amazon. The digital version is also now available on the ByteByteGo site. 

Other Books by Alex Xu You Should Know About

If this is your first exposure to ByteByteGo’s work, check out these related titles:

• System Design Interview — An Insider’s Guide (Vol 1 and 2) — Gold standard for system design prep.
• Machine Learning System Design Interview — Great if you’re aiming for ML-heavy roles.
• Generative AI System Design Interview — A newer book that tackles AI system challenges.
• Coding Interview Patterns — Helps you spot common patterns in coding rounds.

Together, these books form a powerful toolkit for any serious interview candidate.

Final Thoughts: Is This Book Worth It?

In my view, absolutely. Object-Oriented Design Interview: An Insider’s Guide fills a real gap in the interview prep world. OOD interviews are tricky because they sit between pure coding and high-level architecture.

This book helps you navigate that space without getting lost in jargon or over-complication.

The 4-step framework alone makes the book worth reading, but the real value comes from seeing it applied in example after example.

By the time you’re done, you’ll not just know how to design a parking lot system or a vending machine — you’ll know how to approach any OOD problem with confidence.

If you’re aiming for roles at companies where design skills matter, or if you simply want to level up as an engineer, I highly recommend adding this to your prep stack.

I hope this review helps you decide if ByteByteGo fits your coding interview preparation plan! and if you want, you can check out ByteByteGo here: ByteByteGo Platform They are also offering 50% discount now on Year end sale. 

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All the best for your System Design Interviews, if you have any doubts or questions, feel free to ask in the comments.

P. S. — If you just want to do one thing at this moment, go join ByteByteGo and start learning System Design and Coding Interview concepts, you will thank me later. Make it a goal for the new year and you will surely be a better Software Engineer.