Serverless Task Tracker Application using AWS

📌 Project Overview

The Serverless Task Tracker Application is a simple web-based application built using AWS serverless services. It allows users to securely log in, create tasks, and view a list of their tasks. The project demonstrates how frontend, backend, authentication, and database layers can be integrated without managing servers.

This project was developed as part of an internship assignment to understand and implement serverless architecture on AWS.

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🏗️ Architecture Overview

The application follows a fully serverless architecture:

User (Browser)
   ↓
CloudFront (HTTPS)
   ↓
S3 (Static Frontend)
   ↓
Cognito (Authentication)
   ↓ JWT Token
API Gateway
   ↓
Lambda Functions
   ↓
DynamoDB

AWS Services Used

• Amazon S3 – Hosts static frontend files (HTML, CSS, JavaScript)
• Amazon CloudFront – Provides HTTPS access to the frontend
• Amazon Cognito – Handles user authentication and authorization
• Amazon API Gateway – Exposes REST APIs for backend operations
• AWS Lambda – Executes backend business logic
• Amazon DynamoDB – Stores task data

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🔐 Authentication Flow

1. User accesses the frontend via CloudFront URL
2. User clicks Login and is redirected to Cognito Hosted UI
3. User signs up / logs in using email and password
4. Cognito generates a JWT token
5. User is redirected back to the frontend
6. Frontend uses JWT token to securely call backend APIs

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🔄 Application Flow

Login

• Authentication handled by Amazon Cognito Hosted UI
• Secure redirection using HTTPS (CloudFront)

Create Task

• Frontend sends a POST request with task details
• API Gateway triggers CreateTask Lambda
• Lambda stores task data in DynamoDB

View Tasks

• Frontend sends a GET request
• API Gateway triggers GetTasks Lambda
• Lambda retrieves tasks from DynamoDB and returns them

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🧩 Backend APIs

1. Create Task API

• Method: POST
• Endpoint: /tasks
• Function: CreateTask Lambda
• Description: Creates a new task and stores it in DynamoDB

2. Get Tasks API

• Method: GET
• Endpoint: /tasks
• Function: GetTasks Lambda
• Description: Fetches all tasks from DynamoDB

API Gateway uses Lambda Proxy Integration to forward request data to Lambda functions.

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🎥 Demo

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🗄️ Database Design

DynamoDB Table: Tasks

Attribute	Type	Description
taskId	String	Primary key (UUID)
taskName	String	Name of the task

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🚀 Deployment Summary

• Frontend deployed to S3 and served via CloudFront
• Backend deployed using Lambda and API Gateway
• Authentication implemented using Cognito User Pools
• Database managed by DynamoDB

All components are managed services, enabling automatic scaling and reduced operational overhead.

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✅ Key Learnings

• Understanding serverless architecture
• Integrating frontend and backend using AWS services
• Implementing secure authentication using JWT tokens
• Using API Gateway to trigger Lambda functions
• Managing data using DynamoDB

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🏁 Conclusion

This project demonstrates a complete end-to-end serverless application on AWS. It highlights how modern cloud-native applications can be built securely, scalably, and efficiently without managing servers.

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Author: GC

Tech Stack: AWS S3, CloudFront, Cognito, API Gateway, Lambda, DynamoDB