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Webiny is the first Headless CMS which runs on top of AWS serverless infrastructure. It's open-source and you host it on your own AWS cloud. The API also comes with a built-in GraphQL playground, so it’s super simple to inspect your schema and test your queries. Using the Serverless Web Development Framework you can build any type of logic your project requires and deploy it alongside the headless CMS as a separate microservice. With this approach, you get instant rollback feature as well as no need to update and re-deploy your code to any of your devices when you make changes.