serverless is used to manage this project.

The backend is consist of lambda APIs, API Gateway, Cognito for user management, CloudFormation, and DynamoDB to manage the database. Main source structure so far are:

• cognito
• handler
• utils

Installed on your system you will need Node.js 12, Docker, AWS CLI, and AWS SAM CLI

To lint JavaScript files, you will need eslint installed globally.

You will need to run below commands in root directory in order to build backend project and start it in local.

sam build
sam local start-api

To deploy backend, run below command in root directory.

sam deploy

• Allows authentication of new and existing users with email and password
• User pool client id is provided by CloudFomation output.

• Now S3 bucket name is 'email-check-backend'. If you need to change bucket, feel free to change it from samconfig.toml file.

• Current this backend is using the DynamoDB table to process email as pool. To keep the high performance, will need to use memory database like Redis.
• To send email, should be integrated to email service like SendGrid. For that, need keys
• If there are a lot of emails should be processed, try to use AWS Elastic Search.
• Should be added unit tests.