8 Best Resources to Learn Object Oriented Analysis and Design for Tech Interviews
My favorite books and courses to master Object Oriented Analysis and Design for Coding interviews
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Hello guys, Object-Oriented Programming (OOP) and Object-Oriented Design (OOD) remain fundamental skills for software engineers, system designers, and developers preparing for technical interviews.
In 2025, companies still expect candidates to demonstrate mastery over design principles like encapsulation, inheritance, polymorphism, and SOLID principles — not just in theory, but in how they can model and solve real-world problems.
The challenge is that OOP design questions, especially in low-level design (LLD) interviews, can be tricky. They test your ability to break down requirements, identify classes and their relationships, and design extensible, maintainable systems.
If you’ve struggled with designing systems like a Parking Lot, Hotel Management System, or Chess Game, you’re not alone — many engineers find them daunting without proper practice.
If you want to master Object oriented analysis and design for coding interviews and looking for best resources then you have come to the right place.
Fortunately, in 2025 there are excellent resources to help you bridge that gap. From practical coding challenges to in-depth theory courses, I’ve curated seven of the best learning options for OOP design.
Earlier, I have shared best System design courses, System Design Books, and best Places to learn System Design and in this article, I am going to share best resources to crack OOP Design for coding interviews.
These resources include affordable online courses from Udemy as well as interactive courses from DesignGurus.io and Educative.io
I’ve also included Codemia.io for hands-on practice and ByteByteGo’s Object Oriented Design Interview: An Insider’s Guide — a book I consider essential for serious learners.
8 Best Object Oriented Design Resources for Coding Interviews
Here are the best online courses to learn and master OOP analysis and design. This one of the key interview topic along with System Design and you should spend enough time learning this key skills for low level design.
These resources include online courses, books, and AI powered platforms where you can practice solving OOP Design problems online.
1. Grokking the Object Oriented Design Interview
This course is one of the most popular resources for cracking OOP design interviews and its from DesignGurus.io, one of the popular platform for software engineering jobs.
It covers real-world design problems like an online Shopping System, Parking Lot, and Airline Management System, guiding you step-by-step through the requirements gathering, class identification, and interaction modeling process.
Here are the things I liked about this course.
Covers real-world interview problems like Parking Lot, Airline Management System, and Online Shopping System.
Provide step-by-step approach to gathering requirements, identifying classes, and defining interactions.
Includes UML diagrams and example solutions to match FAANG-level expectations.
Great for candidates who struggle with structuring their thoughts in an interview.
If you want structured learning, this is a must-have course for OOP Design and Programming.
Here is the link to join this OOP course — Grokking the Object Oriented Design Interview
2. Grokking the Low Level Design Interview Using OOD Principles — Educative.io
An excellent follow-up to the first course, this one goes deeper into SOLID principles and design patterns while applying them to actual interview problems.
Here are the key skills you will learn in this course:
Deep dive into SOLID principles and when to apply them in low-level design.
Hands-on design problems: ATM, Stock Brokerage, and Chess Game.
Code-first approach with clear, runnable examples.
Self-paced, text-based format — ideal for reading and revisiting concepts quickly.
You’ll also practice building systems like a Stock Brokerage, ATM, and Chess Game, with detailed UML diagrams and clean code examples.
Here is the link to join this course — Grokking the Low Level Design Interview Using OOD Principles
3. Codemia.io — Practice OOP Design Problems
Learning theory is great, but interviews are about practical problem-solving under time pressure. Codemia.io lets you practice real OOP design questions in a simulated environment, helping you identify gaps and improve your speed.
Here are the things I liked about Codemia.io for coding interview preparation:
Interactive platform for timed OOP design challenges.
Realistic environment that simulates interview pressure.
Tracks your progress and highlights weak areas in design.
Great for daily practice after completing theory-based courses.
Also covers System Design in depth
It’s perfect if you’ve already done a course and want to apply your skills before the real interview.
Here is the link to join this OOP Design course — OOP Design on Codemia.io
4. Bugfree.ai — AI-Powered OOP Design Practice
Bugfree.ai takes a modern approach to OOP design preparation by using AI to give instant feedback on your design. You can describe your system, get suggestions for improvements, and even generate UML diagrams instantly.
This is a fantastic way to experiment with multiple solutions and learn from AI-driven code reviews.
Here are the key things about this course.
AI reviews your designs and suggests improvements instantly.
Can generate UML diagrams automatically from your descriptions.
Helps you explore multiple design alternatives quickly.
Perfect for iterative learning — design, review, refine.
It’s very similar to Codemia.io but also provides AI mock interviews which is great to build confidence.
Here is the link to join this AI powered course — Bugfree.ai — AI-Powered OOP Design Practice
5. SOLID Principles of Object Oriented Design
SOLID is one of the most asked topic on coding interview. Last month I have attended almost 5 interviews and 4 of them asked about SOLID principles in one or another way.
And, when it comes to learning SOLID principles this is a great resource to start with.
A bestseller Udemy with over 20,000 students, this course is entirely focused on SOLID principles, ensuring you design systems that are clean, extensible, and maintainable.
Here are the key features of Bugfree.ai platform for OOP Design interview preparation:
Entirely focused on mastering SOLID principles.
Learn to design systems that are extensible, maintainable, and clean.
Real coding examples in Java, C#, and other popular languages.
Bestseller with 20,000+ students — proven track record.
If you struggle with why your designs feel “messy” or “rigid,” this course will help you think like an architect.
Here is the link to join this Udemy course — SOLID Principles of Object Oriented Design and Architecture
6. Low Level System Design, Design Patterns & SOLID Principles — Udemy
One of the things I noticed about engineering preparing for interviews are that they put a lot of effort on learning High level design or System Design but they put no effort mastering Low level System Designs and SOLID which can cost them interviews.
With 12,369 students enrolled, this course blends low-level design techniques with design patterns and SOLID principles.
You’ll learn not only how to structure classes but also when to apply common patterns like Singleton, Factory, and Observer.
Combines low-level design patterns with SOLID principles.
Covers popular patterns like Singleton, Factory, Observer, and more.
Real-world examples for scalable and robust architecture.
Bestseller with 12,000+ students — trusted by developers worldwide.
If you want to learn low level OOP Design or preparing for coding interviews then this course is a great resource to join.
Here is the link to join this Udemy course — Low Level System Design, Design Patterns & SOLID Principles
7. Object Oriented Programming and Design Bootcamp (OOP) — Udemy
This one is a smaller but well-structured course with 104 students, this bootcamp takes you from OOP fundamentals to advanced OOD techniques.
Here are the key things I liked about this course:
Beginner-friendly introduction to OOP and OOD fundamentals.
Gradual transition from basic principles to advanced design concepts.
Includes hands-on coding exercises to reinforce learning.
Small, focused audience for more niche and tailored content.
It’s especially useful for beginners who want a slower pace before diving into intense interview prep.
Here is the link to join this OOP course — Object Oriented Programming and Design Bootcamp (OOP)
8. Object Oriented Design Interview: An Insider’s Guide Book by ByteByteGo
Object Oriented Design Interview: An Insider’s Guide by ByteByteGo is a must-read companion to these courses. It provides clear frameworks for tackling OOD questions, real interview case studies, and step-by-step breakdowns of popular problems.
Here are the things I really liked about this book:
Clear framework for structuring OOD answers in interviews.
Case studies from real FAANG-level interview problems.
Easy-to-follow diagrams and design walkthroughs.
Complements any of the above courses for a complete preparation plan.
If you like ByteByteGo’s diagrams and structured explanations, this book is a goldmine.
Here is the link to get this book — Object Oriented Design Interview: An Insider’s Guide
Conclusion
That’s all about 7 best online courses and platforms to learn Object Oriented Design for interviews. In 2025, OOP design interviews are as relevant as ever — especially for backend, system design, and software engineering roles.
The best approach is to learn the principles from structured courses, practice them in realistic settings (Codemia.io, Bugfree.ai), and reinforce your skills with high-quality reading material like ByteByteGo’s book or the ByteByteGo platform itself.
By investing time in these resources, you’ll not only ace your interviews but also become a better software engineer, capable of designing scalable and maintainable systems in the real world.
By the way, if you want to join multiple course on Udemy, its may be worth getting a Udemy Personal Plan, which will give instant access of more than 11,000 top quality Udemy courses for just $30 a month.If you got a lot of time and want to save money, Udemy Personal Plan will be perfect for you.
All the best for your System Design journey and cracking those interviews! Keep rocking!
P. S. — If you want to do just one thing then you can join ByteByteGo and System Design Concepts and practice coding interviews you will thank me later. It’s one of the most comprehensive resource for not just coding interview but also for senior engineers to get better at their work. They are also offering 50% Discount now.