It's designed to make serverless application development as easy as possible.
For example, with the built-in scaffolds (https://www.webiny.com/docs/how-to-guides/scaffolding/introd...), you can pretty quickly provision a new React application, GraphQL API, or even a full-stack application. Once that's up, further development is as easy as simply starting a new watch session with the "webiny watch" command (https://www.webiny.com/docs/how-to-guides/use-watch-command/). It will make sure that all of the changes that you perform, both on application and cloud infrastructure code level, are automatically deployed into the cloud for you. In a way, this mimics the good-old local development experience.
And there's a lot more, but I'd probably pollute the thread. :)
If you're interested, feel free to ping me, here or maybe via our community Slack (https://www.webiny.com/slack). I'd be glad to assist with any questions / feedback you might have.
@vixalien
P.S. Disclaimer: I work at Webiny :)
It runs on your AWS account and it comes with a local development environment (https://docs.serverless-stack.com/live-lambda-development) as well.
Serverless framework for ruby: https://rubyonjets.com/