did you use Vert.x ? IMHO that has the closest cognitive match to Erlang.

it regularly tops performance benchmarks - https://www.techempower.com/benchmarks/#section=data-r18&hw=... and super simple heroku deployments - https://github.com/vert-x3/vertx-examples/tree/master/heroku...

Also Kotlin !! https://vertx.io/docs/vertx-core/kotlin/ (kotlin vertx on heroku: https://github.com/vert-x3/vertx-examples/tree/master/kotlin...)