Which service helps frontend developers build full-stack apps with authentication and data stores, without managing servers?

• A. AWS Amplify
• B. AWS Device Farm
• C. Amazon AppStream 2.0
• D. AWS IoT Core

Answer: (A)

AWS Amplify is the service that lets frontend developers build full-stack apps with authentication and data stores without managing servers. It gives you a serverless backend you can provision and connect to your frontend with minimal setup. You get user authentication through AWS Cognito, a GraphQL (or REST) API backed by AppSync and DynamoDB, and a data layer with DataStore that handles offline and online data synchronization. It also offers hosting and a simple CI/CD workflow so you can deploy frontend assets quickly. The Amplify CLI and libraries generate and wire up the backend resources to your app, so developers can focus on building the UI rather than infrastructure.

The other services don’t fit this scenario. Device Farm is for automated testing on real devices, AppStream 2.0 streams desktop apps to users, and IoT Core connects devices to AWS for messaging and telemetry. None provide a serverless backend with built-in authentication and data stores for frontend applications.