Comment by rdtsc

Lua can help if you're handing this over to someone else not just devs who know Elixir.

Also, as the sibling post mentioned, in this case Lua is completely interpreted in an Erlang process. That allows a good amount of sandboxing, they have isolated heaps already and you can control memory limits and other resource usages, and all that in a relatively tiny footprint of a few KBs.