Building from scratch wastes a ton of time and I'm a big fan of starting with some working parts and customizing from there. I think with what's going on with AI it makes sense to use python more because all the researchers love python and make examples available through python notebooks. Then your tech stack is less split amongst many languages and there is less complexity and you can hire developers for cheaper. Ruby devs are fairly pricey because they all working in silicon valley-esque well-funded startups. There is a Django boilerplate provider that's really good https://www.saaspegasus.com/. The guy behind it, Corey, is very responsive. All in all, it's probably not the worst thing to use Ruby, as long as you use less weakly-typed javascript :P