> I'm not the person you ask, but we use fullstack Typescript in our dev department. We're a weird mix of a green energy company and an investment bank, so inhouse development is very small-scale, and this means you share resources. Using one language for everything helps with this, since the one person who is really good at React can take a vacation or a sickday without being glued to a laptop since everyone else can also work on the front-end even though it's not their daily thing (and vice versa). More than that though it lets us do things like code reviews, troubleshoot solutions and generally work together really well, even though we're working on very different projects. It also lets us build libraries that can be used for everything.

We do this the other way around, by using Scala.js so we can use Scala on the frontend as well as the backend. It's very nice.