We're not "trying to achieve over them" but instead we have different focus. Our focus is on developers rather than on devops people.
You can setup your infra in stelvio with much less code, almost no worry about IAM, best practices out of the box and developers workflow in mind. E.g. dev mode allows you to change your lambda code live without redeploying.
Real lambda on AWS receives a request which is then forwarded to your local dev environment to handle it and return response which is then forwarded back to real lambda.
This way you can develop and test your code without constantly redeploying.
Yeah, SST seems to be closest thing to Stelvio I guess.
I don't really think we're competitors, their focus is on JS/TS eco system. As you suggested Stelvio focuses on Python and aims to really nail down experience for deploying Python to AWS (and later potentially elsewhere). e.g. we resolve python dependencies for lambda functions and layers and package them for you etc.
In the long run we want Stelvio to be a go to tool for deploying Python (with some nice TUI and web console to make it all really smooth).
[1] https://docs.aws.amazon.com/cdk/v2/guide/work-with-cdk-pytho...
[2] https://www.pulumi.com/docs/iac/languages-sdks/python/