Object-Oriented Design (OOD) interviews are common for software engineering roles at top tech companies. They assess how well you can model real-world problems, think in terms of objects and responsibilities, and design flexible, maintainable systems.
But good OOD questions are hard to come by—until now.
We’ve created a comprehensive object-oriented design interview question bank, inspired by actual interview problems from companies like Google, Meta, Amazon, ByteDance, Microsoft, and top startups.
🧩 What You’ll Find in Our OOD Question Bank
- Realistic interview prompts
- Categorized by system domain (games, tools, services, infrastructure)
- Varying difficulty levels for new grads to senior engineers
- Step-by-step breakdowns and design patterns used
Whether you’re prepping for an entry-level interview or a senior software engineering round, these questions will sharpen your object modeling, class relationships, and design thinking.
💡 Sample Questions We Cover
🎮 System & Game Design
- Design a chess game (Google)
- Design a Tic-Tac-Toe game (Amazon)
- Design a parking lot system (ByteDance)
🧰 Tool & Utility Design
- Design a file system
- Design an elevator control system
- Design a rate limiter
📦 Service & Platform Design
- Design a vending machine
- Design a movie ticket booking system
- Design an online stock trading platform
🧠 Scalable Modeling
- Design a notification system
- Design a user session management system
- Design an audit logging framework
Each question reflects the kinds of modeling challenges you'd face in companies where clean design and extensibility are critical.
🛠️ What Our OOD Solutions Include
- Use case clarification and assumption handling
- UML-style class design and relationship mapping
- Design principles and trade-offs discussion
- Interface definitions and extensibility hooks
- Guided breakdown using SOLID principles and common design patterns (Factory, Strategy, Observer, etc.)
👥 Learn with the Community
You can also:
- Browse community-submitted solutions
- See how others apply different patterns
- Share your own answers and receive feedback
Object-Oriented Design is as much about clear thinking and flexibility as it is about code. Practicing these questions will help you become a better architect and communicator—skills that interviewers value deeply.
Because clean architecture starts with great design interviews.