I'm at Tinfoil Security, and we use Elixir for dynamic security scanning of web applications and APIs. We also have some Phoenix apps, but the bulk of our Elixir use isn't in web development.
It's a very IO-bound problem (how many requests I can make while staying within rate limits / not taking down a service), so Elixir is a great fit for coordinating all of the concurrent work involved in security scanning.
It's a very IO-bound problem (how many requests I can make while staying within rate limits / not taking down a service), so Elixir is a great fit for coordinating all of the concurrent work involved in security scanning.