Has anyone used pulumi in order to provision on demand stacks from within an application? I have a pretty simple application that I want to deploy that will essentially have a different JSON configuration that users of my application will be able to configure. Is this something pulumi can handle? How would I go about calling the pulumi up command from within the context of my backend?

That would probably be a case for the Automation API.

Ahh sweet that was exactly what I was looking for. Thank you Thomas

There's several webinars and demo videos on tools like this. You could check Pulumi's YouTube channel, I think there's at least one good one there.