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You might want to look at https://www.inngest.com for that. Disclaimer: I'm a cofounder. We released event-driven step functions about 20 months ago.

Looks cool but looks like it's only typescript. If there is a json payload, couldn't any web server handle it?

We support TS, Python, Golang, and Java/Kotlin with official SDKs, and our SDK spec is open, so yes — any server can handle it :)