Rails-Postgresql-React app

To deploy above application you could look into Elastic Beanstalk.

Specifically for Rails you could follow this link: https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/ruby-rails-tutorial.html.

Alternatively you could try to containerize your app and again use Elastic Beanstalk with Single Docker deployment or App Runner: https://docs.aws.amazon.com/apprunner/latest/dg/service-source-code-ruby.html