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HLD LLD Agentic AI

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📚LLD Introduction

Introduction to LLD

🎯OOP Fundamentals

Classes & Objects

🔗Class Relationships

💡Design Principles

YAGNI Principle

Clean Code Practices

⭐SOLID Principles

Single Responsibility Principle

Open/Closed Principle

Liskov Substitution Principle

Interface Segregation Principle

Dependency Inversion Principle

📊UML Diagrams

Sequence Diagrams

Use Case Diagrams

🎨Additional Patterns

Factory Pattern

Singleton Pattern

Observer Pattern

Strategy Pattern

Decorator Pattern

Adapter Pattern

Builder Pattern

Command Pattern

Template Method Pattern

💼LLD Interview Tips

LLD Interview Approach

Common LLD Mistakes

Evaluation Criteria

❓LLD Interview Questions

Design Parking Lot

Design Elevator System

Design Library System

Design Vending Machine

Design Chess Game

Design Hotel Booking

Design Snake & Ladder

Design Tic Tac Toe

Design Movie Booking

Design Chat Application

Design Splitwise

Design Food Delivery

Design Cricinfo

Design Logger System

Design File System

Design Social Network

Design Stack Overflow

Design Online Auction

2/5

LLD|⭐ SOLID Principles| 20 min

Open/Closed Principle

Intermediate20 min read+10 XP

TL;DR — Open/Closed Principle

Learn Open/Closed Principle — a key concept for LLD interviews.

Interactive — Try it yourself!

How to use

1Click "O" — Open/Closed Principle

2See BAD code: adding shapes means modifying AreaCalc (risky!)

3Click "✅ Good Code" — each shape calculates its own area

4New shape? Just add a new class — zero risk to existing code

In a nutshell

OCP: Software should be OPEN for extension (add new features) but CLOSED for modification (don't change existing working code). Use interfaces/inheritance to add new behavior without touching old code.

Single Responsibility Principle

Liskov Substitution Principle