I just got out of the job where we were working on legacy ETL "script" in Elixir, and terrible code architecture decisions aside, I think the pattern where you have to launch and monitor long lasting jobs is a breeze in BEAM. You just spawn one process for each job, report back via mailbox and monitor via Supervisor. Unfortunately making changes to that system where all sources were hardcoded was to say at least abysmal, but the job running core was quite elegant.

Hopefully Elixir and other BEAM compiled languages will gain enough traction, I can't imagine rewriting something that available in Erlang from the box in OOP languages with mutable objects.