Introduction to Low-Level Design & Designing Our First LLD System | Day 1 | LLD Bootcamp

Welcome to Day 1 of the CodeKerdos LLD Bootcamp! In this first session, we introduce Low-Level Design (LLD) and understand how it differs from High-Level Design (HLD). We also discuss why LLD is important not only for technical interviews but also for writing clean, maintainable, and extensible software in real-world engineering. In this session, we cover: ✅ Introduction to LLD ✅ What is Low-Level Design? ✅ LLD vs HLD ✅ Why LLD matters in software engineering ✅ How LLD is evaluated in technical interviews ✅ Why good LLD focuses on extensibility and maintainability ✅ Object-Oriented Programming (OOP) Classes and Objects Access Modifiers Static vs Instance Members Constructors The this keyword ✅ The four pillars of OOP: Encapsulation Abstraction Inheritance Polymorphism ✅ Design Principles ✅ Composition over Inheritance ✅ SOLID Principles ✅ Single Responsibility Principle (SRP) ✅ Open/Closed Principle (OCP) ✅ Liskov Substitution Principle (LSP) ✅ Interface Segregation Principle (ISP) ✅ Dependency Inversion Principle (DIP) ✅ DRY (Don't Repeat Yourself) ✅ KISS (Keep It Simple, Stupid) ✅ YAGNI (You Aren't Gonna Need It) The goal of this bootcamp is not just to memorize design patterns or write class diagrams. We will focus on understanding how to think about software design, identify responsibilities, choose the right abstractions, and build systems that can evolve as requirements change. This is the first class of the CodeKerdos LLD Bootcamp. In the upcoming sessions, we will take these fundamentals and apply them to real-world LLD problems, design patterns, and complete system design exercises. If you're preparing for LLD interviews or want to become better at designing clean and maintainable software, follow the complete bootcamp series. #LLD #LowLevelDesign #LLDInterview #SystemDesign #OOP #SOLID #DesignPatterns #SoftwareEngineering #CodeKerdos #LLDBootcamp