Low-Level Design (LLD) & Design Patterns

A collection of Low-Level Design problems, Design Patterns, and SOLID Principles implemented in Java.
This repository is aimed at practicing object-oriented design, clean coding practices, and system design fundamentals.

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📌 Features

• Design Patterns: Implementations of commonly used design patterns like Singleton, Factory, Strategy, Observer, etc.
• SOLID Principles: Examples of how to apply the 5 SOLID principles for maintainable and scalable code.
• LLD Problems: Practical system design problems such as Parking Lot, BookMyShow, Bitly, etc.
• Clean Code: Focus on modular, reusable, and extensible architecture.

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📂 Project Structure

├── DesignPatterns: Creational, Structural, Behavioral patterns
├── SOLID: Implementations of SOLID principles
├── LLDProblems: Real-world system design problems
├── HLDModule/Problems: Additional practice problems
└── README.md: Project documentation

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🚀 Tech Stack

• Language: Java
• Concepts: Object-Oriented Programming (OOP), Design Patterns, SOLID Principles, System Design

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🎯 Use Case

This repository can be used by:

• Developers preparing for system design/LLD interviews
• Students learning OOP and design principles
• Engineers aiming to improve clean code and scalable design skills

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📖 References

• Head First Design Patterns
• Clean Code by Robert C. Martin

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⚡ Contributions are welcome! Feel free to fork, raise issues, or submit PRs.