Hmm, now that I look at it my personal code is mostly gnarly functional libraries. https://github.com/m50d/plus-minus-zero/ is probably the project that's closest to something I'd do in Python, but I've still used a fancy reactive library and some functional tools for dealing with the explicit async futures.

(It's a quick calculator tool to compute your European Mahjong Associaton rank score based on your tournament results, and can import your existing results through some quick and dirty web scraping. The domain linked from github has expired, but it's running at https://adoring-khorana-c20461.netlify.app/ - Scala usually runs on the JVM but this build is set up to compile to JS and run in the browser).