“React Native”

Builds GitHub Actions CI for Expo apps - verify on every PR, SHA-pinned actions, pinned runners and Node, device lanes, manual EAS releases.

Gates test-only code behind one literal TEST_ONLY switch: debug menu, debug link, simulated clock and offline.

Structures a design system: two-tier tokens, contrast-proven light/dark palettes, the theme provider, makeStyles, text roles, fonts.

Proves built screens match approved design references (iOS, Android, light/dark, RTL) per element.

Keeps ios/ and android/ generated from app.config.ts and tested config plugins.

Moves an Expo app to the next SDK and Xcode/Android toolchain in one proven commit - expo install --fix, overrides, breaking changes.

Tunes game difficulty with seeded headless bots: sim reports, balance bands, tuning knobs, a fun-in-seconds test.

Hosts a game module through one typed seam: game screen, pause, undo, hints, a rescue, saved runs, results.

Guards data and pixel goldens - *.golden.test.ts snapshots, append-only [contract] entries, Skia tolerance, jest -u rules.

Shows, picks and stores images - expo-image, picker, camera, a media store.

Comet Native workflow.

Assembles Release APKs with Gradle on an AVD started by name (pinned JDK and SDK) and inspects them.

Orders an Expo app's cold start - polyfills, error net, splash hold, storage open, providers, splash release, background flush.

Wires APP_VARIANT builds: per-variant ids, names, icons, schemes, EXPO_PUBLIC_* as public, secrets in EAS/CI, test code out of store bundles.

Adds, upgrades and removes npm packages in Expo apps under a written policy - expo install, exact pins, 7-day release age, script review, licences.

Writes and runs Maestro E2E flows on iOS simulators and Android emulators - testID steps, debug-link setup, screenshot baselines.

Configures EAS Build and Submit: eas.json profiles, remote build numbers, fingerprints, gated store submits.

Draws icons and app art in code - a Skia-path icon set, a brand mark, adaptive icons, splash, store art.

Sells a Premium unlock with expo-iap behind a PurchasePort - saved entitlement, paywall states, restore, refunds, store testing.

Builds Release iOS simulator apps (clean prebuild, pinned Xcode, UDID-named simulator) and proves the .app.

Cross-platform UI/UX design reviewer grounded in Apple's Human Interface Guidelines (123 pages pulled from developer.apple.com, including 57 component pages)…

Cross-platform UI/UX design reviewer grounded in Apple's Human Interface Guidelines (123 pages pulled from developer.apple.com, including 57 component pages)…

Use this skill for Expo/React Native motion accessibility, reduced motion, haptics, UI-thread performance, frame pressure, gestures, and manual device proof.

UI/UX design intelligence for web and mobile.