Learning Path

Low-Level Design Learning Path

Master the fundamentals of low-level design with comprehensive guides on OOP, SOLID principles, design patterns, concurrency, and system design fundamentals.

Theory + Practice

Code Examples

Real-world Applications

What You'll Learn

Comprehensive coverage of essential low-level design concepts

3 Patterns

Design Patterns

Learn 23 Gang of Four design patterns with real-world examples and code implementations

CreationalStructuralBehavioral

4 Concepts

OOP Concepts

Master object-oriented programming principles: Encapsulation, Inheritance, Polymorphism, and Abstraction

Classes & ObjectsInheritancePolymorphismAbstraction

5 Principles

SOLID Principles

Understand the five fundamental principles of object-oriented design for maintainable code

Single ResponsibilityOpen/ClosedLiskov SubstitutionInterface Segregation

6 Topics

Concurrency & Multithreading

Learn thread safety, synchronization, locks, and concurrent data structures

ThreadsLocksThread PoolsSynchronization

System Design Walkthroughs

LLD Interview Tutorials

Step-by-step walkthroughs of the most asked Low-Level Design interview questions — with class diagrams, code, and design decisions.

Medium

Parking Lot System

Design a multi-level parking lot that supports different vehicle types, ticketing, and payment processing.

OOPStrategy PatternFactory Pattern

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Hard

Elevator System

Design a multi-elevator system with intelligent scheduling, floor requests, and door management.

State MachineObserver PatternScheduling

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Medium

Vending Machine

Design a vending machine that handles inventory, payment, change dispensing, and product selection.

State PatternOOPPayment

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Medium

Library Management

Design a library system supporting book search, borrowing, reservations, and overdue tracking.

Observer PatternSearchNotifications

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HardSoon

Hotel Booking System

Design a hotel booking platform with room management, reservations, pricing, and cancellations.

Facade PatternStrategyCalendar

MediumSoon

Movie Ticket Booking

Design a movie ticketing system with seat selection, payment, and booking management.

Composite PatternConcurrencyOOP