Learn how we built Argo, a powerful extensibility framework that allows developers to seamlessly extend Shopify's apps on every platform. Argo provides developers with APIs to execute behaviour on the main app and a component library that renders native UI identical to Shopify's own component whether it's on iOS, Android or Web. Behind the scenes, Argo uses web workers and an open sourced library called remote-ui to create a sandboxed execution environment for external scripts.