I wasn't very clear with my earlier description; the frontend is a SPA served by Node.js, while the backend is a completely separate GraphQL API service which I'm considering to rewrite in Clojure.

So the frontend can actually do SSR to render PDFs or emails. However, it would definitely be much harder to to ensure that any phone formatting or fee calculation done directly in the user's browser matches what the API returns. So yeah, definite benefits in sharing a language there. Thanks for the examples!