Low-Level Design (LLD)

Master object-oriented design, SOLID principles, and design patterns

What You'll Master

Skills You'll Gain:

  • OOP principles and SOLID design principles
  • All 23 Gang of Four design patterns with real examples
  • Solve real-world problems: Parking Lot, Elevator, Chess, etc.
  • Create class diagrams, write clean code, build extensible systems

Key Concepts:

SOLIDDesign PatternsOOPUML DiagramsClean CodeExtensibility

🚀 Learning Path

1

Learn Principles

Start with OOP and SOLID principles to build a strong foundation.

2

Master Patterns

Study all 23 design patterns with examples and use cases.

3

Apply to Real Systems

Practice with real-world case studies like Parking Lot and Elevator.

💡 Interview Success Tips

LLD interviews test your ability to design clean, maintainable, and extensible systems.

  • ✓ Always start by clarifying requirements and constraints
  • ✓ Identify core entities, their attributes, and relationships
  • ✓ Apply SOLID principles to make your design flexible
  • ✓ Use appropriate design patterns to solve common problems
  • ✓ Draw clear UML diagrams to communicate your design