Discover how to build Argo, a powerful extensibility framework for seamlessly extending Shopify's apps across multiple platforms, in this conference talk from React Summit Remote Edition 2021. Explore the APIs that allow developers to execute behavior on the main app and learn about the component library that renders native UI identical to Shopify's own components on iOS, Android, and Web. Dive into the behind-the-scenes technology, including web workers and the open-sourced remote-ui library, used to create a sandboxed execution environment for external scripts. Gain insights into advanced React techniques for building cross-platform, extensible applications in this 19-minute presentation.