WebAssembly is a compilation target and execution environment often used in Browsers to speed up intensive algorithms that would be slow in pure JavaScript. But Elixir can run WebAssembly too and it’s about much more just speedy code execution. In this session, we will talk about wasmex, a WebAssembly runtime written in Elixir. We investigate common use cases of WebAssembly and how they benefit Elixir hosts. If you are interested in running unsafe (user-provided) programs in your Elixir application, or you want to interface with programs written in other programming language, or even in speeding up your algorithms, this talk is for you.