How One Team Cut Mobile Design Review Cycles Using EAS Preview Builds

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A mobile development team integrated Expo Application Services (EAS) preview builds directly into their design review workflow to catch device-specific issues earlier. Previously, designers only saw changes in Figma or on their phones a day after a build shipped, missing real-device behaviors like touch targets, scroll momentum, and font rendering. The team wrapped EAS build commands in a Slack slash command so designers could trigger their own iOS preview builds from a named branch without involving engineers. They also configured an EAS Update channel to push JavaScript-only changes to already-installed builds, compressing design iteration from roughly one build per day to four to six updates per hour during active reviews. The approach prioritized removing friction points such as the install step and build-status uncertainty, making real-device sign-off a standard part of the design process.

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