The "0 to 1" workflow right out of AWS could not be easier, they have an in-browser code editor with a hello world already written for you.

But that workflow doesn't make sense for real dev teams. So there's https://github.com/serverless/serverless . It's driven by a yaml file and is intuitive.

The only thing I'm bothered by is lack of environment variables (have to hard code them) and terrible API Gateway latency - see https://news.ycombinator.com/item?id=12681926 further down the page