Let's try a different tack.
https://speakerdeck.com/mosic/elixir-at-evercam?slide=6
Make more sense now? :) (in addition to the other responses)
tl;dr Evercam replaced Node.js, Sidekiq, Pusher and Upstart with Elixir, huge net gain in stack simplicity which is arguably a strong plus from a long-term maintenance perspective.