Low Level Design

Master system design fundamentals, SOLID principles, and design patterns.

Learning Path

1. Fundamentals

Start with LLD basics and UML diagrams.

2. SOLID Principles

Learn the five fundamental principles of object-oriented design:

• Single Responsibility Principle
• Open/Closed Principle
• Liskov Substitution Principle
• Interface Segregation Principle
• Dependency Inversion Principle

3. Design Patterns

23 Gang of Four patterns with examples:

• Creational (Singleton, Factory, Builder, etc.)
• Structural (Adapter, Decorator, Proxy, etc.)
• Behavioral (Observer, Strategy, Command, etc.)

4. Case Studies

Real-world system design problems:

• Parking Lot System
• Elevator System
• Chat Application
• Library Management
• E-commerce System

Code Examples

Complete implementations available in:

• Java
• C++
• Python
• TypeScript