Ask HN: Is there a visual roadmap for software projects?

Hey HN, I'm a consultant working with a non-technical client. I'd like to show to them a visualization of what it takes to create a moderately complex web application, so they have a better understanding of the scope ahead.

A roadmap like this one: https://roadmap.sh/frontend (designed to show what it takes to become a front-end developer) but for more general software projects would be great! Any ideas if there's something online already for this?