Welcome!
This comprehensive resource covers low-level design patterns, real-world system implementations, and interview preparation guides for building scalable systems.
📖 Read Full Guide📚 Introduction
OOP Principles
Learn the fundamental object-oriented programming principles that form the foundation of good system design.
View Content →Class Diagram
Understand how to read and create class diagrams to visualize your system architecture.
View Content →Interface vs Abstract Class
Explore the differences and use cases between interfaces and abstract classes.
View Content →🏗️ Design Patterns
Creational Patterns
Patterns for creating objects: Factory, Builder, Singleton, Abstract Factory.
View Patterns →Structural Patterns
Patterns for object composition: Adapter, Composite, Decorator, Facade.
View Patterns →Behavioral Patterns
Patterns for object interaction: Observer, Strategy, Command, Iterator.
View Patterns →💼 Real-World Examples
Complete implementations with 75-minute guides and interview-ready code:
Parking Lot
Design a parking lot management system with multiple levels and spot management.
View Example →Amazon Locker System
Design a system for Amazon pickup lockers with inventory management.
View Example →Elevator System
Implement an intelligent elevator management system for multi-floor buildings.
View Example →Car Rental System
Design a car rental platform with inventory and reservation features.
View Example →Ride Sharing (Circinfo)
Build a ride-sharing application like Uber with matching algorithms.
View Example →Library Management System
Design a library system with book management and lending features.
View Example →🏢 Company Tagged
Amazon Interview Questions
Collection of real Amazon low-level design interview questions.
View Questions →Uber Interview Questions
Collection of real Uber low-level design interview questions.
View Questions →