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Introduction to Low Level Design (LLD)

Object Oriented Programming (OOP)

SOLID Principles

Strategy Pattern

Factory Design Pattern

Singleton Design Pattern

Observer Design Pattern

Command Design Pattern

Adapter Design Pattern

Facade Design Pattern

Composite Design Pattern

Template Method Design Pattern

Chain of Responsibility Design Pattern

Bridge Design Pattern

Builder Design Pattern

Proxy Design Pattern

Iterator Design Pattern

Flyweight Design Pattern

State Design Pattern

Mediator Design Pattern

Prototype Design Pattern

Visitor Design Pattern

Memento Design Pattern

Anti-Patterns and Null Object Pattern

Introduction to High Level Design (HLD)

Network Protocols in High Level Design (HLD)

Microservices Design Patterns

Consistent Hashing

Back-of-the-Envelope Estimation

SQL vs NoSQL Databases

Idempotent APIs

Distributed Messaging Queue

Proxy and Reverse Proxy

Distributed Caching

Caching in Distributed Systems

Distributed Transactions

Database Indexing

Concurrency Control

JWT Authentication

OAuth (Open Authorization)

Cryptography in High Level Design

Thundering Herd Effect

Domain Name System (DNS)

Event Driven Architecture (EDA)

Dual Write Problem

Bulkhead Pattern

Circuit Breaker Pattern

High Availability Systems - Active-Active and Active-Passive Architectures

Change Data Capture (CDC)

Content Delivery Network (CDN)

Command Query Responsibility Segregation (CQRS)

Throughput and Latency

Long Polling vs Server-Sent Events (SSE)

Geospatial System Design

Distributed ID Generation

Serverless-First Architecture

What is a Backend Server?

Backend Routing

Serialization & JSON Fundamentals

Authentication & Authorization

Data Validation in Backend Systems

Request Lifecycle, Handler-Service-Repository, Middleware, and Context

REST Architecture and Roy Fielding’s 6 Constraints

Persistence, Databases, and Postgres Data Types

Caching Explained

Background Tasks and Task Queues

Inverted Index and Super-Fast Search

Configuration Management - The DNA of Your Application

A Beginner's Guide to Logging, Monitoring, and Observability

Graceful Shutdown

Backend Security Fundamentals

Scaling and Performance Engineering

Concurrency and Parallelism

Cross-Origin Resource Sharing (CORS)

Cross-Site Request Forgery (CSRF)

Content Security Policy (CSP)

Sitemap, Robots.txt, and Web Manifest

Design a Chat System

Design a Complete Like and View System

Design a Live Streaming Service for Global Sports Broadcasting

Design a Real-Time Location Tracking System for Ride-Hailing and Delivery Platforms

Design a Complete Stock Brokerage Platform Like Zerodha

Design a Reddit-Style Nested Infinite Comment System

Design Google Drive

Design a Complete Instagram-Like Social Media System

Design a Complete Online Payment System

Design a ChatGPT-Style Real-Time AI Chat System

Design a Real-Time Game Leaderboard

Design a Complete Search Engine Like Google

Design a URL Shortener

Design a Complete Amazon-Scale E-Commerce System

Design Google Docs Real-Time Collaboration System

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Microservices Design Patterns

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