EAS Build

EAS Build, short for Expo Application Services Build, is a cloud service that compiles your React Native app into real native iOS and Android binaries. It is the foundation of shipping an app without owning a Mac or fighting local build tooling. Before you can submit anything to the App Store or Google Play, your code has to be turned into a signed native package the stores accept. EAS Build does that in the cloud - you run one command, it produces the builds, and you never touch Xcode.

The reason EAS Build matters is the barrier it removes. Traditionally, building an iOS app required a Mac, an Xcode setup, provisioning profiles, and signing certificates - hours of friction before you even had something to test. Building for Android meant a separate Android Studio toolchain. EAS collapses all of that into a cloud service that handles the native compilation and much of the signing for you. A solo builder on a Windows machine or a Chromebook can produce a real iOS build, which used to be impossible without Apple hardware.

The mistake new builders make is thinking they need to master native tooling before they can ship. They do not. With Expo, EAS Build produces the binary and EAS Submit uploads it to both stores, so your job is to build the app and run two commands. Always test the resulting build on a real device through TestFlight or Google's internal track before you submit, and confirm the signing is correct. The club's EAS Submit playbook covers the exact commands so you can go from code to a build on both stores from one pipeline.