🏗️ Web Application Architecture - User to Database Flow

👤 User Layer

📱 Client Layer

⚛️ Frontend Layer

🚪 API Gateway Layer

🔧 Microservice Layer

⚡ Cache Layer

💾 Database Layer

📁 File Storage Layer

👤 User

End Users

📱 Mobile

iOS/Android App

💻 Desktop

Desktop App

🌐 Web

Browser

⚛️ React

Frontend Framework

🚪 Node.js

API Gateway

🍃 Spring Boot

Java Microservice

🚂 Express

Node.js API

🐍 Flask

Python API

⚡ Redis

In-Memory Cache

🐬 MySQL

Relational Database

🍃 MongoDB

Document Database

🔍 Elasticsearch

Search & Analytics

☁️ AWS S3

Object Storage

🌊 DigitalOcean

Spaces Storage

Step 1: User Request

Step 2: Client Interface

Step 3: Frontend Processing

Step 4: API Routing

Step 5: Business Logic

Step 6: Cache Check

Step 7: Data Persistence

Step 8: File Storage