Serverless Web Application

Last Modified: September 8, 2025

Summary:

This architecture demonstrates how to build and run a highly scalable web application without managing servers. Static assets such as HTML, CSS, and JavaScript are hosted on Amazon S3 and delivered globally through CloudFront for low latency. API requests are routed via Amazon API Gateway to AWS Lambda functions, which handle business logic and integrate seamlessly with DynamoDB for persistent data storage. Authentication and user management are handled by Amazon Cognito, while Route 53 provides reliable DNS resolution and traffic routing.

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Serverless Web Application

Architecture Workflow

  1. A user types domain in the browser and the DNS query goes to Amazon Route 53.
  2. Route 53 resolves the domain and directs the request to CloudFront distribution.
  3. CloudFront serves the requested static files from its edge cache or fetches them from the S3 artifact bucket if not cached.
  4. The browser loads the static web app and sends API requests to the API Gateway endpoint.
  5. API Gateway receives the request, enforces any auth/validation, and forwards it to the correct AWS Lambda function.
  6. The Lambda function runs the business logic and reads from or writes to DynamoDB as needed.
  7. Lambda returns the result to API Gateway, which formats the HTTP response and sends it back to the browser.
  8. The frontend updates the UI with the response, while CloudFront continues caching static assets for future requests.

Technology Stack

  • AWS API Gateway
  • AWS Lambda
  • AWS DynamoDB
  • AWS Cognito
  • AWS CloudFront
  • AWS S3
  • AWS Route53