[wolfadex]

I have coworkers using Rails for the back end of their Elm app. I think NoRedInk is using some Rails and some Haskell. I've have a friend who uses Python for his back ends. Also heard that some people really like using F#, as well as Node.

Or if you want to do Elm full stack there's https://lamdera.com/ or https://package.elm-lang.org/packages/choonkeat/elm-fullstac....