Build High-Performance Flutter Apps

Flutter Expert is a specialist skill for building high-performance, multi-platform Flutter applications on Flutter 3.x+ and Dart 3.x. It covers the full stack of what that means in practice: core Flutter mastery (widget composition, the Impeller rendering engine, custom render objects, Material Design 3 and Cupertino, accessibility-first widgets); Dart 3.x language features (patterns, records, sealed classes, null safety, Future/Stream/Isolate concurrency, FFI for C/C++ interop); state management across the ecosystem's major options - Riverpod 2.x, Bloc/Cubit, GetX, Provider, Stacked, MobX, and Redux; and architecture patterns including Clean Architecture, MVVM/MVP/MVI, the repository pattern, dependency injection (GetIt, Injectable, Riverpod), and CQRS. It also covers platform integration (iOS/Android platform channels, PWA/web, Windows/macOS/Linux desktop, embedded/IoT), performance work (widget-rebuild minimization, DevTools profiling, image and list-virtualization strategies, Isolate offloading, 60/120fps frame targets), animation and custom UI (AnimationController/Tween, Hero transitions, Rive/Lottie, custom painters), testing (unit, widget, golden-file, and integration testing with Patrol), data persistence (SQLite, Hive, ObjectBox, Drift, GraphQL, Dio-based REST), CI/CD and deployment (Codemagic, GitHub Actions, Bitrise, code signing, app-store automation), and security (secure storage, certificate pinning, biometric auth via local_auth, code obfuscation, GDPR).

Use it for Flutter development tasks - architecture decisions, state management selection, platform-specific integration, performance optimization, testing strategy, or deployment across mobile, web, desktop, or embedded targets. It is not the right skill for tasks unrelated to Flutter, or for a different domain or tool outside this scope; and its output is not a substitute for environment-specific validation, testing, or expert review - stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.

Input: a Flutter/Dart development task - an architecture question, a feature to implement, a performance problem, or a testing/deployment need. Output follows a fixed response approach: analyze the requirements for the right architecture, recommend a state-management solution sized to the app's complexity, provide platform-optimized code with performance and accessibility considered from the start, include a testing strategy, and address deployment and security proactively. It always uses Dart 3 null safety, and includes error handling, loading states, and accessibility annotations.

• State management: Riverpod 2.x, Bloc/Cubit, GetX, Provider, Stacked, MobX, Redux
• Data: SQLite, Hive, ObjectBox, Drift, Firebase/AWS/Google Cloud storage, GraphQL via Ferry or Artemis, Dio
• Platform: Swift/Kotlin platform channels, ARCore/ARKit, TensorFlow Lite, BLE, WebSockets
• CI/CD: Codemagic, GitHub Actions, Bitrise
• Testing: mockito, testWidgets, golden files, Patrol
• Detailed examples live in resources/implementation-playbook.md

Teams and developers building or maintaining a Flutter application across mobile, web, desktop, or embedded platforms who want expert-level guidance on architecture, state management, performance, testing, and deployment.