Metabase is written in clojure, if you want to see the source code of a large web app
NASA's Common Metadata Repository is worth exploring too https://github.com/nasa/Common-Metadata-Repository
It is a neat example of how an org can structure and manage multiple projects and services in a single git repository. They've use Leiningen to achieve their objective.
> The Common Metadata Repository (CMR) is an earth science metadata repository for NASA EOSDIS data. The CMR Search API provides access to this metadata.
> Building and Running the CMR
> The CMR is a system consisting of many services. The services can run individually or in a single process. Running in a single process makes local development easier because it avoids having to start many different processes. The sections below contain instructions for running the CMR as a single process or as many processes.
(edit: add relevant context for quick reference)
https://flownet.com/gat/jpl-lisp.html
> Debugging a program running on a $100M piece of hardware that is 100 million miles away is an interesting experience. Having a read-eval-print loop running on the spacecraft proved invaluable in finding and fixing the problem. The story of the Remote Agent bug is an interesting one in and of itself.
- Clojure: https://clojure.org/community/companies
- ClojureScript: https://clojurescript.org/community/companies
Also, a few case studies may interest you: https://clojure.org/community/success_stories and community stories: https://clojure.org/community/community_stories
We are also hiring Clojure devs: https://www.metabase.com/jobs
The web frontend is written in TypeScript/React.