Hi, @paulgasbarra. You cannot run netlify dev in the build system at Netlify. Well, technically you can but doing so isn’t supported in any way and won’t do anything useful.
Examining the repository for this site, it appears to depend on a Node.js application runtime. The only way to run Node.js code after the build at Netlify is via serverless functions:
However, the code in the GitHub repository for this site isn’t designed to use serverless functions and it is trying to use a Node.js server instead. Netlify doesn’t offer Node.js server hosting. That is Heroku style hosting and Netlify doesn’t provide this.