🧩 Mastering Low-Level Design (LLD) – A Complete Guide

Low-Level Design (LLD) is a crucial part of software development that focuses on designing individual modules, classes, interfaces, and their interactions. It’s about how a system is implemented at the code level, once the high-level structure is already in place.

---

🧠 What is Low-Level Design?

Low-Level Design involves:
Defining class diagrams, method signatures, interfaces
Designing using OOP principles: Encapsulation, Inheritance, Polymorphism
Implementing real-world systems like BookMyShow, Parking Lot, Splitwise, Amazon Cart

🔧 Core Topics in LLD

1. Object-Oriented Programming (OOP)
   Classes, Objects
   Abstraction, Inheritance, Encapsulation, Polymorphism
2. SOLID Principles
   Single Responsibility Principle
   Open/Closed Principle
   Liskov Substitution Principle
   Interface Segregation Principle
   Dependency Inversion Principle
3. Design Patterns
   Creational: Singleton, Factory Method, Abstract Factory, Builder, Prototype
   Structural: Adapter, Bridge, Composite, Decorator, Facade, Flyweight, Proxy
   Behavioral: Mediator, Memento, Interpreter, Iterator, Chain of Responsibility, Command, State, Strategy, Observer, Null Pointer, Template Method, Visitor
4. UML Diagrams
   Class Diagrams
   Sequence Diagrams
   Component Diagrams
5. Case Studies / Design Problems
   Design a Cab Booking System
   Design a Logger
   Design a Tic Tac Toe Game
   Design Elevator System

🎯 Why LLD Matters
Used in system design interviews at companies like Amazon, Google, Flipkart, and Swiggy
Helps write modular, maintainable, and scalable code
Bridges the gap between design architecture and actual implementation

📘 How to Learn LLD Effectively?
Practice real-world design questions
Build small projects using design patterns
Study open-source codebases
Watch mock interviews and design sessions on YouTube

🛠 Recommended Resources
Books: Design Patterns by GoF, Clean Code by Robert C. Martin
Platforms: Low Level Design at roadmap.sh, GeeksforGeeks, InterviewBit
GitHub Projects: Search for LLD project repositories for practice

Mastering Low-Level Design (LLD) – A Complete Guide

🧠 The LLD Interview Strategy
Clarify requirements—ask for constraints, edge cases, performance needs
Identify components/classes—break down the system and define responsibilities.
Draw diagrams—use class and sequence diagrams to show structure and interactions
Apply design patterns & principles—use SOLID and patterns where appropriate.
Discuss trade-offs—explain why you chose certain data structures or patterns.
Refine & conclude—review the design, improve based on feedback or alternative scenarios

Low-Level Design (LLD)

📢 Follow Us For More Updates

🔔 YouTube Channels:
👉 Trendy VS Vlogs
👉 VS Coding Academy

📱 Join Our WhatsApp Channel for the latest job opportunities and updates:
👉 VS_CODING_ACADEMY WhatsApp Channel

Mastering Low-Level Design (LLD) – A Complete Guide

For DSA Guide: https://vscodingacademy.com/category/dsa-guide/

For Career Road Maps : https://vscodingacademy.com/category/career-roadmaps/

For Software Job Openings : https://vscodingacademy.com/category/software-job-openings/