An object-oriented design (OOD) interview is a specialized technical interview used to evaluate your understanding of object-oriented programming principles and your ability to apply these principles to solve design problems. Typically lasting 45-60 minutes, this interview covers the basics of object-oriented programming and more complex concepts such as design principles and patterns. This is crucial for roles at major tech companies like Apple, Google, Meta, Microsoft, and Amazon.
Grokking the Low Level Design Interview Using OOD Principles
A battle-tested guide to object-oriented design interviews—developed by FAANG engineers. Master OOD fundamentals and practice real-world interview questions.
- Apply OOP fundamentals, including encapsulation, abstraction, inheritance, and polymorphism, to real design problems
- Use SOLID principles and common design patterns (creational, structural, behavioral) to write clean, maintainable systems
- Break down open-ended OOD interview problems into requirements, components, and interactions using a bottom-up approach
- Design class, use case, sequence, and activity diagrams for 20+ real-world systems (parking lots, elevators, Amazon, LinkedIn, and more)
- Implement complete solutions in Java, Python, C++, C#, or JavaScript
- Practice with 19 mock interviews simulating real-world FAANG OOD rounds
Learn to think like a Software Architect
Strengthen your OOD fundamentals
Design real-world systems step by step
Put your skills to the test
Learning Roadmap
1.
Introduction
Introduction
2.
Cornerstones of Object-Oriented Programming
Cornerstones of Object-Oriented Programming
3.
Object-Oriented Design
Object-Oriented Design
8 Lessons
8 Lessons
4.
Object-Oriented Design Principles
Object-Oriented Design Principles
7 Lessons
7 Lessons
5.
Design Patterns
Design Patterns
7 Lessons
7 Lessons
7.
Designing a Parking Lot
Designing a Parking Lot
9 Lessons
9 Lessons
8.
Designing an Elevator System
Designing an Elevator System
9 Lessons
9 Lessons
9.
Designing a Library Management System
Designing a Library Management System
9 Lessons
9 Lessons
10.
Designing the Amazon Locker Service
Designing the Amazon Locker Service
9 Lessons
9 Lessons
11.
Designing a Vending Machine
Designing a Vending Machine
8 Lessons
8 Lessons
12.
Designing an Online Blackjack Game
Designing an Online Blackjack Game
8 Lessons
8 Lessons
13.
Designing a Meeting Scheduler
Designing a Meeting Scheduler
9 Lessons
9 Lessons
14.
Designing a Movie Ticket Booking System
Designing a Movie Ticket Booking System
9 Lessons
9 Lessons
15.
Designing a Car Rental System
Designing a Car Rental System
9 Lessons
9 Lessons
16.
Designing ATM
Designing ATM
9 Lessons
9 Lessons
17.
Designing a Chess Game
Designing a Chess Game
8 Lessons
8 Lessons
18.
Designing a Hotel Management System
Designing a Hotel Management System
9 Lessons
9 Lessons
19.
Designing the Amazon Online Shopping System
Designing the Amazon Online Shopping System
9 Lessons
9 Lessons
20.
Designing Stack Overflow
Designing Stack Overflow
9 Lessons
9 Lessons
21.
Designing a Restaurant Management System
Designing a Restaurant Management System
9 Lessons
9 Lessons
22.
Designing Facebook
Designing Facebook
9 Lessons
9 Lessons
23.
Designing an Online Stock Brokerage System
Designing an Online Stock Brokerage System
9 Lessons
9 Lessons
24.
Designing a Jigsaw Puzzle
Designing a Jigsaw Puzzle
4 Lessons
4 Lessons
25.
Designing an Airline Management System
Designing an Airline Management System
9 Lessons
9 Lessons
26.
Designing ESPNcricinfo
Designing ESPNcricinfo
9 Lessons
9 Lessons
27.
Designing LinkedIn
Designing LinkedIn
9 Lessons
9 Lessons
28.
Wrapping Up
Wrapping Up
2 Lessons
2 Lessons
Fahim ul Haq
Software Engineer, Distributed Storage at Meta and Microsoft, Educative (Co-founder & CEO)
Trusted by 2.9 million developers working at companies
Amir Sayyed
Learner
Sunil Kumawat
Senior Software Engineer @ Detech Technologies
Krishna K.
Spotnana
Built for 10x Developers












Free Resources