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HI, The overall architecture you propose is sound. You can use S3 to host a static website, like a ReactJs single-page-application. To set that up, I'd recommend looking into Amplify Hosting, which helps you set up git-integration with CI/CD functionalities to automatically deploy as you commit new changes to the application.
To receive data from the ReactJs application you can use the API Gateway -> Lambda -> DynamoDB pattern. If you don't want to do any server-side validation and just post the data straight into the DB, you can use the API Gateway -> DynamoDB pattern. Both of these are available in Serverless Land.
AWS has a walk-through of how this can be done at Create Dynamic Contact Forms for S3 Static Websites Using AWS Lambda, Amazon API Gateway, and Amazon SES
AWS has a good walk-through for setting up Lambda with API Gateway:
If the use case is just a simple website with a form, I'd probably do all the validation on the front end and do direct API Gateway --> DynamoDB.
If you want submitting the form to set in motion a number of events such as sending an email, notifying customer service, updating a database, etc etc, you could use API Gateway --> EventBridge. Then create rules on EventBridge to trigger these events.
Check this link for API Gateway --> EventBridge integration.
https://serverlessland.com/patterns/apigateway-rest-eventbridge
I recently finished a project that addressed your requirements. I used NextJS with their Vercel hosting and SAM to manage the API and Lambda with CloudFormation. I’m using SES to send an email and then record the data in DynamoDB. My Lambda is written in Golang, but you can get the idea of things from this repo.
The only thing missing from the API currently is authentication. I was planning on using Cognito and the token from an un-authenticated user, however that's proving somewhat challenging. If anyone has tips on that I'd love to hear from you.
