iOS, Android and cross-platform crashes, builds, store rejections.
After adding German and Spanish to our Flutter app, release builds showed raw keys like checkout.pay_button instead of text. The new translation files were declared as assets only on one laptop, never in the repository. How we found it, fixed the declarations and moved to compile-time localizations.
Our Flutter app grew from five screens to sixty, and every change touched widgets, API calls and state in the same file. The structure we moved to: feature-first folders, with UI, state, repository and service layers whose dependencies point one way, and how each layer is tested.
A security review found refresh tokens sitting in plain text in our Flutter app's preferences file. This guide sorts local data into three buckets, explains what shared_preferences, Hive (and its maintained hive_ce fork) and flutter_secure_storage actually do on each platform, and covers the uninstall and backup traps.
Releasing our React Native app used to take a developer most of a day: bump versions, sign, build two platforms, upload, fill in notes. We moved it to fastlane lanes run from CI on a git tag. Project layout, versioning, signing with match, TestFlight and Play internal tracks, secrets, and what still needs a human.
Our delivery app tracks a driver's route during a delivery. After targeting Android 14, tracking stopped minutes after the screen turned off, and on some devices the app crashed when tracking started. Android 14 requires a declared foreground service type and permission. How we fixed it.
A practical crash triage workflow for iOS and Android teams: get readable stack traces with dSYMs and R8 mapping files, group crashes sensibly, reproduce with context, fix with a test and confirm the fix per release with staged rollouts.
After upgrading to React Native 0.79 with the New Architecture on by default, our in-house printer module came back null on iOS and crashed on Android. Bridge-only registration and direct bridge calls were the cause; here is the migration path.
Our Flutter app gained about 9 MB of Dart heap every time a user opened and closed the order details screen, until older Android phones killed it. DevTools showed dozens of retained State objects held alive by a stream subscription and an AnimationController that were never disposed.
Bumping targetSdk to 35 put our toolbar under the status bar and the Pay button under the navigation bar on Android 15 devices. Edge-to-edge is now enforced, so we handled window insets properly in both Views and Compose screens.
After moving iOS builds to a self-hosted Mac runner with fastlane match, archives hung for an hour at the codesign step, or failed with errSecInternalComponent. codesign was waiting for a keychain it could not unlock without a GUI prompt. How setup_ci, a temporary keychain and the key partition list fixed it.
Our React Native app ran perfectly in debug, then the release APK closed instantly on every device. adb logcat showed a ClassNotFoundException for a class used through reflection by a native SDK, which R8 had removed during minification. How we read the crash, wrote keep rules and verified with mapping.txt.
A new Android Studio with JDK 21 forced a Gradle upgrade, the Gradle upgrade pulled in AGP 8, and AGP 8 rejected two old Flutter plugins with Namespace not specified. How we untangled the Gradle, AGP, Kotlin and JDK chain.
Our yearly Apple distribution certificate expired, we created a new one, and every archive failed: the provisioning profile doesn't include the signing certificate. Profiles embed the certificates they trust. How we regenerated profiles, cleaned keychains and verified signing identities.
A routine iOS release bounced from App Store Connect with ITMS-91053 for UserDefaults, file timestamps and system boot time. Our own code needed reasons, and an old statically linked SDK shipped no manifest at all. Here is the full cleanup.