Event Notification System – Serverless Event Platform

🎯 Purpose

Cloud-powered event notification platform enabling users to subscribe to event alerts and create announcements through a static website backed by serverless AWS infrastructure.

🏗️ Architecture

• Amazon S3 – Frontend hosting and event data storage
• Amazon SNS – Email subscription management and notifications
• AWS Lambda – Backend processing logic
• API Gateway – RESTful endpoint management
• IAM – Secure access control

⚙️ Technical Implementation

Architecture Flow

User → S3 Static Site → API Gateway → Lambda → SNS/S3 → Email Notification

Subscribe Flow

Process:

1. User submits email via /subscribe endpoint
2. API Gateway routes to Lambda function
3. Lambda validates email and adds to SNS topic
4. SNS sends confirmation email

Create Event Flow

Process:

1. User creates event via /create-event endpoint
2. Lambda appends event to events.json in S3
3. Lambda triggers SNS notification to all subscribers
4. Frontend dynamically loads updated events

Frontend Deployment

SNS Configuration

🎯 Key Features

• ✅ Serverless architecture with zero server management
• ✅ Real-time event notifications via email
• ✅ Static site hosting with dynamic content loading
• ✅ RESTful API design with CORS support
• ✅ IAM least-privilege security model

📊 Technical Highlights

• Event-driven architecture using SNS pub/sub pattern
• S3 static site hosting with API Gateway integration
• Lambda functions for decoupled business logic
• CORS-enabled REST API for frontend communication
• Secure credential management via IAM roles

🔧 API Endpoints

Subscribe Endpoint

POST /subscribe
{
  "email": "user@example.com"
}

Create Event Endpoint

POST /create-event
{
  "title": "Event Name",
  "date": "2024-01-01",
  "description": "Event details"
}

🔒 Security Implementation

• IAM roles with least-privilege access
• API Gateway authorization
• CORS configuration for cross-origin requests
• SNS subscription confirmation workflow
• Secure credential management

📈 Use Cases

• Event management platforms
• Community announcement systems
• Newsletter subscription services
• Real-time notification systems
• Marketing campaign platforms

🎓 Architecture Decisions

• S3 for hosting: Cost-effective static site delivery
• SNS for notifications: Scalable pub/sub messaging
• Lambda for logic: Pay-per-execution serverless compute
• API Gateway for APIs: Managed REST endpoint infrastructure

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Built with: AWS Lambda | S3 | SNS | API Gateway | IAM | Python

Tags: aws serverless lambda s3 sns api-gateway event-driven notifications