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Learn Low Level Design (LLD) and prepare for interviews using free resources.

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This repository contains resources to learn Low Level Design (LLD) / Object Oriented Design (OOD) and prepare for interviews.

📌 Fundamental Concepts

⚙️ Design Patterns

Creational Patterns	Structural Patterns	Behavioral Patterns
Singleton	Adapter	Chain of Responsibility
Factory Method	Bridge	Command
Abstract Factory	Composite	Iterator
Builder	Decorator	Mediator
Prototype	Facade	Memento
	Flyweight	Observer
	Proxy	State
		Strategy
		Template Method
		Visitor

🗂️ UML

✅ How to Answer a LLD Interview Problem

💻 Low Level Design Interview Problems

Easy

Design Parking Lot
Design a Vending Machine
Design Stack Overflow
Design Logging Framework
Design Coffee Vending Machine
Design Traffic Signal Control System
Design a Task Management System

Medium

Design Pub Sub System
Design Tic Tac Toe Game
Design Car Rental System
Design an ATM
Design Hotel Management System
Design LinkedIn
Design a Social Network like Facebook
Design an Elevator System
Design a Library Management System
Design Restaurant Management System
Design Airline Management System
Design a Digital Wallet System
Design an Online Auction System
Design a Concert Ticket Booking System
Design a Cache using LRU Eviction Policy

Hard

Design Movie Ticket Booking System
Design Splitwise
Design a Snake and Ladder game
Design Online Shopping System like Amazon
Design Online Stock Brokerage System
Design CricInfo
Design Chess Game
Design Ride-Sharing Service (like Uber)
Design Online Food Delivery Service (like Swiggy)
Design Music Streaming Service (like Spotify)
Design University Course Registration System

📚 Books

Additional resources

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Learn Low Level Design (LLD) and prepare for interviews using free resources.