Welcome to the Low Level Design Repository!
This repository contains Java implementations of core Design Patterns and real-world LLD Problems commonly asked in system design interviews at top tech companies.

• Design Patterns : Core design patterns grouped under Creational, Structural, and Behavioral categories.
• Design Problems : End-to-end implementation of real-world system design problems using OOP principles and patterns.

• Abstract Factory

• Builder

• Factory

• Prototype

• Singleton Variants:

  • Singleton - Basic
  • Double Lock
  • Enum Singleton
  • Thread Safe
  • Bill Pugh
  • Lazy Initialization
  • Eager Initialization

• Template Method
• Observer
• Memento
• State
• Iterator
• Chain of Responsibility
• Command
• Mediator
• Strategy

• Proxy
• Decorator
• Facade
• Adapter
• Composite
• Flyweight

These projects demonstrate how to apply design principles and patterns in real-world system design problems.

• Movie Ticket Booking System
• Elevator System
• Rate Limiter
• Logging Framework
• LRU Cache
• StackOverflow Clone
• Parking Lot

git clone https://github.com/zsanjay/Low-Level-Design.git

Design Patterns: Elements of Reusable Object-Oriented Software (GoF)

Feel free to fork the repo, raise PRs, or suggest enhancements! If you find the repo useful, give it a ⭐ to show support!

For questions or collaborations, connect via LinkedIn or open an issue.