Design a Library Management System

Easy

+150 XP

PRO

Low Level DesignLLDSystem DesignOOPFactory PatternObserver PatternStrategy PatternState Management

Design a Library Management System with book search, borrowing, returning, reservations, and fine calculation.

Library Catalog

Available

System Design Interview

Alex Xu

ISBN: 978-1

Loaned

Clean Code

Robert Martin

ISBN: 978-2

Available

The Pragmatic Programmer

Andrew Hunt

ISBN: 978-3

Available

Design Patterns

GoF

ISBN: 978-4

Loaned

Refactoring

Martin Fowler

ISBN: 978-5

Simulation Time

Day 1

Member: Me

ID: user1

Current Fines$0

My Loans (1/3)

Clean Code

Due in 4 days

What You'll Build

Members can search for books by title, author, ISBN, or genre using in-memory data structures.
Members can register and authenticate to access library services.
Members can borrow available books, and the system tracks the due date (14 days from borrowing date).
Members can return borrowed books, and the system automatically calculates fines if the book is overdue.
Members can reserve books that are currently unavailable (all copies are loaned out).
...and more

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Step-by-Step Guidance

Follow our systematic 8-step approach to design the system from scratch. Learn how to identify actors, assign responsibilities, and create class diagrams.

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Interactive UML Builder

Build class diagrams visually with our drag-and-drop UML editor. Connect classes, define relationships, and see your design come to life.

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Multi-Language Support

Practice in Python, Java, C++, TypeScript, JavaScript, or C#. Get complete solutions and explanations in all supported languages.

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AI-Powered Review

Get instant feedback on your design and code. Our AI reviews your implementation and suggests improvements based on best practices.

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Design Patterns

Learn how to apply design patterns like Low Level Design, LLD and more. Understand when and why to use each pattern.

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Complete Solutions

Access detailed solutions with explanations, UML diagrams, and code implementations. Learn from industry best practices.

🐍 Python ☕ Java 📘 TypeScript 🟨 JavaScript ⚡ C++ 🟣 C#

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