Flutter App Development

iOS and Android apps from a single Flutter codebase -- consumer products, marketplace apps, service booking tools, and feature-rich mobile products that need to reach both platform audiences without the cost of building and maintaining two separate native codebases. State management architecture chosen per project complexity: Riverpod for most apps (compile-time safety, no context dependency), Bloc for complex event-driven business logic requiring explicit state transitions, Provider for simpler apps. GoRouter handles deep linking and navigation with URL-based routing that mirrors web patterns. Dio with interceptors covers authenticated API communication, token refresh, and request retry. RevenueCat manages in-app purchase and subscription logic across App Store and Google Play with a unified SDK rather than separate platform purchase code. Push notifications via Firebase Cloud Messaging with platform-specific payload handling. App Store and Google Play submissions handled end-to-end, including app signing, metadata, and review responses.

Internal enterprise apps for field workers and operational staff who use both iOS and Android devices -- a single Flutter codebase that covers the full device mix without separate native development streams. Drift (a type-safe SQLite ORM for Flutter) handles offline data storage with migration support; background sync via WorkManager (Android) and BGTaskScheduler (iOS) pushes queued changes when connectivity is restored. Barcode scanning via the mobile_scanner package supports 1D/2D codes on commodity hardware rather than requiring dedicated scanning peripherals. Document capture with the camera package and OpenCV-backed edge detection pre-processes captured images before upload. Certificate pinning prevents man-in-the-middle attacks on corporate networks. Biometric authentication via the local_auth package supports fingerprint and Face ID for secure login without password entry on shared devices. Deployed via MDM (Jamf, Intune), Apple Business Manager, or Android Enterprise Managed Google Play -- bypassing public app store review cycles for enterprise distribution. One codebase, one maintenance stream.

Flutter's web target lets the same Dart codebase that powers your mobile app also run in a browser -- useful when you need a companion web interface alongside your mobile product without building a separate web frontend. Two rendering strategies: CanvasKit renders using WebAssembly and gives pixel-identical output to the mobile app at the cost of a larger initial download (~2MB WASM payload); the HTML renderer produces lighter pages but with minor visual divergence. CanvasKit is the right call for dashboards and admin interfaces where rendering fidelity matters more than initial load speed; HTML renderer for lighter utility pages where first-paint time is prioritised. Flutter web has meaningful SEO limitations -- content is rendered on a single canvas element that search crawlers cannot index -- which makes it unsuitable for content pages or public-facing marketing surfaces where organic search matters. We assess whether Flutter web or Next.js/React is the right choice for the web portion of your product based on those tradeoffs.

Flutter and Firebase work well together via the FlutterFire SDK -- Firestore for real-time data with live snapshot listeners that push updates to the UI without polling, Firebase Auth for email/password, Google, Apple, and phone authentication without building an auth server, Cloud Functions (Node.js runtime) for business logic that shouldn't run client-side (payment processing, webhook handling, admin operations), and Firebase Cloud Messaging for push notifications with topic-based fan-out. Firebase Remote Config enables feature flag rollouts and A/B tests without app store updates. Firebase Crashlytics captures crash reports with stack traces and affected device counts. Firebase Performance Monitoring tracks network request latency and screen rendering performance on real devices. Firestore Security Rules enforce data access at the database layer, not just in app code. The combination covers most MVP and mid-complexity product requirements without a custom backend -- where your product needs data models, integrations, or business logic that exceed Firebase's capabilities, we scope a Node.js API alongside the Flutter app.

Migration of existing React Native apps to Flutter -- when performance requirements have outgrown the JavaScript bridge latency (typically noticed in complex animations, custom gestures, and screens with high-frequency UI updates), when custom graphics via Skia outperform what React Native's layout engine handles, or when consolidating onto a single cross-platform stack is operationally simpler. The React Native JavaScript bridge introduces an async boundary between JS and native code that Flutter's Dart-to-native compilation eliminates entirely -- the result is smoother 60fps rendering on mid-range Android hardware that couldn't sustain it through the bridge. Migration process: feature parity audit documents every screen, API integration, third-party SDK, and platform-specific behaviour; screen-by-screen Flutter implementation runs in a parallel repo while the React Native app stays in production; automated UI comparison tests (Flutter Driver or integration_test) validate visual and behavioural parity before cutover. CodePush-equivalent hot deployment is available via Shorebird for Dart code patches post-migration. The migration that improves animation performance and UI consistency without losing cross-platform scope.

Ongoing Flutter development after initial launch -- new features, Flutter SDK version upgrades, iOS and Android OS compatibility updates, and the bugs that surface from production usage across a heterogeneous device population. Flutter DevTools identifies jank frames (frame render times exceeding 16ms at 60Hz) and memory leaks in Dart isolates; Firebase Crashlytics captures production crashes with symbolicated stack traces for prioritisation. Dart and Flutter package version management on pub.dev: outdated dependencies accumulate breaking changes and security advisories -- we audit, upgrade, and resolve conflicts on a release cadence rather than letting them pile up. App Store and Google Play target API level requirements change annually -- Google mandates apps target the current SDK within one year of its release; missing the deadline prevents updates from being submitted. Performance profiling on mid-range Android devices (the Pixel 3a is a common baseline) catches render performance issues that don't appear on flagship test hardware. CI/CD via Codemagic or Bitrise automates builds, signs, and submits to TestFlight and Google Play Internal Testing on each merged PR. The sustained engagement that keeps a Flutter product shippable against two platform release cycles per year.