Flutter and Dart engineers for iOS, Android, web, and desktop -- screened live on architecture patterns, state management (Bloc, Riverpod), platform channels, and multi-platform delivery. Shortlisted in 72 hours. Flat 15% fee.
Trusted by 90+ product teams shipping Flutter apps globally
150+
Vetted Flutter Devs
72h
To Shortlist
15%
Flat Fee
Top 5%
Acceptance Rate
150+
Vetted Flutter Devs
4 Platforms
iOS, Android, Web & Desktop
$0
Matching Fee
72h
To Shortlist
15%
Flat Management Fee
14-day
Free Replacement
Flutter developers matched on state management approach, platform targets, and Dart architecture depth
A Flutter developer who only knows widgets cannot build production-grade apps. We screen for Dart depth, architecture patterns, platform integration, and multi-target delivery.
Every engineer passes a live technical screen: Dart language depth (async/await, Streams, Isolates, null safety, generics), Flutter widget lifecycle (StatefulWidget vs StatelessWidget, keys, inherited widgets), chosen state management pattern assessed in depth (Bloc events/states, Riverpod providers and scoping, or other approaches), and custom widget and painting performance. We do not accept self-reported 'Flutter experience'.
A Bloc engineer who thinks in event-driven state machines is not the same as a Riverpod engineer who thinks in provider graphs, which is not the same as a GetX engineer. We match on your existing or preferred state management approach and assess engineers on architectural patterns (Clean Architecture layers, repository pattern, use cases) rather than just widget knowledge.
Flutter's multi-platform promise only delivers if engineers understand the constraints of each target: platform channels for native API access on iOS and Android, Flutter Web rendering modes (HTML vs CanvasKit) and SEO limitations, and desktop window management. We distinguish between mobile-only Flutter developers and engineers with genuine multi-platform production experience.
Most Flutter apps need native integrations at some point -- Bluetooth LE, biometric auth, push notifications, background processing, camera, or payment SDKs. Engineers without platform channel experience (MethodChannel, EventChannel, HostApi) cannot build or maintain these integrations. Platform channel capability is a screening criterion in our technical assessment.
Flutter agencies charge $150-250/hr for engineers who cost $60-90/hr. Our fee is a flat 15% on the engineer rate, published in every contract. You see exactly what the engineer earns. There is no matching fee and no cost to receive your shortlist.
Every engagement includes weekly delivery reports, crash monitoring setup requirements (Firebase Crashlytics), widget and integration test coverage standards, CI/CD pipeline support (Codemagic, Fastlane, GitHub Actions), and a dedicated account manager. You get a managed Flutter team with quality accountability -- not a contractor who disappears after launch.
Anonymised profiles from our active pool. Every developer has passed a live Dart and Flutter technical screen including state management, architecture, and platform delivery assessment.
Flutter Architect -- Bloc & Clean Architecture
South-East Asia · 6 years
Architected Flutter app for logistics company: Bloc-driven offline-first sync, Clean Architecture with use cases, Firebase Firestore + Crashlytics, and Dart Isolates for background data processing. Ships to iOS, Android, and web from one codebase. 98% crash-free rate in production.
Flutter Engineer -- Riverpod & Multi-Platform
Eastern Europe · 5 years
Built Flutter e-commerce app targeting iOS, Android, and Flutter Web from one codebase. Riverpod provider architecture with code generation (Freezed, Riverpod Generator). Custom CanvasKit-rendered product viewer. Codemagic CI/CD for all three platforms.
Flutter Desktop & Web Engineer
Latin America · 7 years
Specialist in Flutter beyond mobile: Flutter Desktop for Windows and macOS enterprise apps (file system, window management, native menus), Flutter Web with CanvasKit for pixel-perfect fidelity. Built internal HR tool shipped to 2,000 employees on Windows + macOS with Drift SQLite persistence.
Flutter & Firebase Full-Stack Engineer
South Asia · 4 years
Builds Flutter apps with full Firebase backend: Firestore real-time data, Firebase Auth (Google, Apple, phone), Cloud Functions for server-side logic, FCM push notifications, and Firebase Remote Config for A/B feature rollouts. 300K MAU app running on Firebase + Flutter.
Flutter Platform Channel Specialist
Western Europe · 8 years
Specialist in Flutter native integrations: MethodChannel and HostApi (Pigeon) for type-safe platform channel design, Bluetooth LE device communication, NFC, biometric authentication, background services, and health data (HealthKit, Google Fit). Bridges Flutter to native SDKs that have no Dart package.
Flutter Performance & Animation Engineer
Eastern Europe · 6 years
Specialist in Flutter UI performance: CustomPainter for data visualisation components, Rive animation integration, Impeller rendering engine migration, jank elimination via DevTools timeline profiling, and Dart Isolate offloading for compute-heavy operations. Reduced frame drop rate from 8% to 0.3% on a data-heavy dashboard app.
All profiles are anonymised. Full profiles including app links and references shared after brief submission. Rates are engineer rates before the 15% management fee.
Dart-depth-matched shortlisting in 72 hours. Every developer pre-screened on architecture, state management, and production delivery track record.
Tell us your target platforms (iOS, Android, web, desktop, or a combination), your state management preference or existing approach (Bloc, Riverpod, Provider, GetX), the nature of the engagement (greenfield app, feature addition, migration from React Native/native, or architecture refactor), and any native integrations required (Bluetooth, payments, health data, background services).
A developer who has built a single Flutter to-do app is not in our pool. We match on verified production Flutter experience: shipped apps on App Store or Play Store, specific state management patterns used at scale, platform channel experience where required, and multi-platform targets if relevant. Your brief determines the screening focus.
Every shortlisted developer has passed a live technical assessment: Dart language depth (async programming, Streams, Isolates, null safety), Flutter widget tree and state management (assessed on their claimed pattern), architecture design (Clean Architecture layers, repository pattern, dependency injection), platform channel design for native integrations, and performance debugging with Flutter DevTools.
Once you select a developer, we manage the engagement: weekly delivery reports, crash monitoring requirements (Firebase Crashlytics), widget test and integration test coverage, CI/CD pipeline setup support (Codemagic or Fastlane), and a dedicated account manager. You get a managed Flutter team with accountability -- not a contractor who vanishes after launch. Delivery also includes Flutter flavour configuration documentation (development, staging, production environments), Codemagic or Fastlane pipeline handover with all signing credentials, and a widget test coverage report confirming ≥70% coverage of all custom widgets.
From mobile iOS and Android to Flutter Web, Desktop, platform channels, performance, and CI/CD. Tell us your platform targets in the brief.
Production Flutter apps for iOS and Android from a single Dart codebase. Bloc or Riverpod state management, Clean Architecture with use cases and repositories, Firebase backend integration, offline-first data sync with Hive or Drift, and App Store/Play Store submission via Codemagic or Fastlane.
Flutter Web for internal tools, dashboards, and admin panels where pixel-perfect rendering matters more than SEO. CanvasKit renderer for complex UI, HTML renderer for better browser compatibility, responsive layout adaptation, and shared codebase with the mobile app for maximum code reuse.
Flutter Desktop for Windows, macOS, and Linux enterprise tools. Native window management, file system access via platform channels, system tray integration, keyboard shortcuts, and Drift SQLite for local database. Ideal for field tools, data entry apps, and internal enterprise software that needs cross-OS deployment.
Flutter platform channel engineering for native features that have no Dart pub.dev package -- or where existing packages are insufficient. Pigeon for type-safe HostApi definitions, MethodChannel for bidirectional Flutter-native communication, EventChannel for native event streams, and background service isolation on iOS and Android.
Flutter UI performance optimisation: jank elimination via Flutter DevTools timeline profiling, Dart Isolate offloading for CPU-intensive work, const widget promotion, RepaintBoundary placement, custom RenderObject for complex layouts, Impeller rendering engine migration, and image caching strategy.
Flutter build and release automation: Codemagic workflow configuration for multi-platform builds, Fastlane lanes for code signing and store submission, GitHub Actions for Flutter, flavour (flavor) configuration for dev/staging/prod environments, automated version bumping, and beta distribution via TestFlight and Play Store internal track.
State management choice, platform support status, and the essential packages every production Flutter app uses.
Event-driven state machine
Best for
Large teams, strict separation, testability, complex business logic
Complexity
Higher
Testability
Excellent
Adoption
Most widely used in enterprise Flutter
Watch out
Verbose for simple features -- Cubit reduces this
Provider graph with compile-time safety
Best for
Modern codebases, code generation, flexible scoping, async state
Complexity
Medium
Testability
Excellent
Adoption
Fastest-growing, modern default choice
Watch out
Riverpod 2.x with code generation is a paradigm shift from 1.x
InheritedWidget wrapper
Best for
Simpler apps, teams migrating from Flutter basics
Complexity
Low
Testability
Good
Adoption
Widely used but being superseded by Riverpod
Watch out
Scaling beyond medium complexity becomes painful
Reactive + dependency injection + routing
Best for
Rapid prototyping, small teams, all-in-one solution
Complexity
Low initially, high at scale
Testability
Weaker
Adoption
Popular in LATAM/India; mixed enterprise reception
Watch out
Couples too many concerns; harder to test and maintain at scale
Renderer: Impeller (default iOS 3.10+)
Full production support. HealthKit, ARKit, StoreKit via platform channels.
Renderer: Impeller (opt-in Android 3.16+)
Full production support. Google Pay, Play Billing, Wear OS via channels.
Renderer: HTML or CanvasKit (choose per use case)
Best for SPAs and internal tools. Limited SEO. Not recommended for content sites.
Renderer: Metal via Impeller
Production-ready. Menu bar, window management, file system via platform channels.
Renderer: DirectX / Angle
Production-ready. Win32 API access via platform channels. MSIX packaging.
Renderer: OpenGL
Stable but smaller ecosystem. GTK plugin support. Less enterprise adoption.
dio
HTTPInterceptors, retry, multipart upload
go_router
NavigationDeclarative routing, deep links
freezed
Code GenImmutable data classes, sealed unions
riverpod_generator
Code GenAnnotation-based Riverpod
hive_ce / isar
Local DBFast NoSQL for Flutter
drift
Local DBType-safe SQLite with Dart
firebase_core
BackendFirebase suite entry point
flutter_bloc
StateOfficial Bloc implementation
get_it
DIService locator for Flutter
injectable
DICode-gen DI with get_it
flutter_hooks
HooksReact-style hooks for Flutter
auto_route
NavigationCode-gen routing with guards
8 competency domains: Dart language, widgets, state management, architecture, storage, networking, platform channels, and testing. Every developer assessed live.
Dart async: Future, async/await, Stream
Dart Isolates for compute offloading
Null safety and sound type system
Generics, extensions, mixins
Code generation (build_runner, macros)
StatefulWidget / StatelessWidget lifecycle
InheritedWidget and context propagation
CustomPainter and Canvas API
Animations (implicit, explicit, Rive)
Slivers and custom scroll physics
Bloc: events, states, BlocBuilder, BlocListener
Riverpod 2.x providers and scoping
Provider: ChangeNotifier, MultiProvider
flutter_hooks: useState, useEffect, custom hooks
GetX: controllers, reactive bindings
Clean Architecture (domain/data/presentation)
Repository pattern and use cases
Dependency injection (get_it, injectable)
Feature-based project modularisation
Offline-first architecture with sync
Drift (SQLite) with typed queries
Hive / Isar NoSQL for fast storage
Shared Preferences for simple KV store
Secure storage (flutter_secure_storage)
Offline sync conflict resolution
Dio HTTP client with interceptors
Firebase (Auth, Firestore, Storage, FCM)
GraphQL with Ferry or graphql_flutter
WebSocket and real-time streams
REST API integration with Freezed models
MethodChannel for bidirectional calls
EventChannel for native event streams
Pigeon for type-safe HostApi generation
Background service isolation
Swift/Kotlin for custom plugin development
Widget tests with testWidgets
Integration tests (integration_test package)
Unit tests with mocktail / mockito
Codemagic / Fastlane pipeline setup
Firebase Crashlytics + performance monitoring
Skill levels reflect pool inclusion minimums. Engineers specialise in 2-3 domains at depth. Platform channel proficiency is only required when specified in your brief.
Questions that reveal real Dart and Flutter depth. Widget quiz questions tell you nothing about architecture, performance, or platform integration skill.
Walk me through how you structure a Flutter feature using Bloc. Show me how a user login flow -- from button tap to authenticated state -- flows through your architecture.
Why this question
Tests Bloc architecture depth: LoginEvent sealed class design, LoginState (initial/loading/success/failure), BlocBuilder vs BlocListener vs BlocConsumer usage, repository injection via context.read(), and how the Bloc interacts with a use case or repository. Strong candidates draw the event flow without hesitation.
Red flag answer
I put my API call inside the Bloc and update a variable. No understanding of events, states, or layers.
Explain how Riverpod 2.x differs from version 1.x and describe the trade-offs between AsyncNotifierProvider, StreamProvider, and FutureProvider for fetching remote data.
Why this question
Tests Riverpod modernity: understanding of code generation with @riverpod annotation, Ref object replacing ProviderReference, AsyncNotifier for mutable async state vs FutureProvider for read-only futures, and StreamProvider for Firestore real-time streams. Weak candidates describe Riverpod 1.x patterns as if they are current.
Red flag answer
I use FutureProvider for everything. No awareness of Riverpod 2.x or when AsyncNotifierProvider is appropriate.
Your Flutter app's main feed screen is dropping frames to 40fps on a mid-range Android device. The screen shows a ListView of complex cards with images. Walk me through your debugging and optimisation process.
Why this question
Tests Flutter performance depth: Flutter DevTools timeline for frame analysis, widget rebuild profiling with the Widget Inspector, const widget promotion, RepaintBoundary to isolate expensive repaints, ListView.builder vs ListView (lazy loading), cached_network_image for image loading, and Dart Isolate for any data processing.
Red flag answer
I would reduce the number of widgets on screen. No profiling approach, no knowledge of DevTools.
Design a platform channel integration to read step count data from Apple HealthKit on iOS and Google Fit on Android in a Flutter app. What approach would you use?
Why this question
Tests platform channel depth: choice between MethodChannel (simpler, single calls) vs Pigeon/HostApi (type-safe, code-gen), writing Swift code for HealthKit HKStatisticsQuery, Kotlin code for Google Fit DataReadRequest, handling async results back to Dart, and error propagation across the channel boundary.
Red flag answer
I would find a pub.dev package. No ability to design or implement custom platform channels.
How would you implement offline-first data in a Flutter app where a user can create records while offline and sync them when connectivity is restored, handling conflict resolution?
Why this question
Tests offline architecture: local DB choice (Drift for relational, Hive/Isar for document), sync queue pattern (storing pending operations as events), connectivity_plus for network monitoring, Dart Isolate for background sync, and conflict resolution strategy (last-write-wins vs server-authoritative vs versioned).
Red flag answer
I would cache the last API response in shared_preferences. No understanding of sync architecture or conflict resolution.
Set up a Codemagic CI/CD pipeline for a Flutter app with three flavours (dev, staging, production) that builds for iOS and Android, runs tests, and automatically submits to TestFlight and Play Store internal track on main branch merges.
Why this question
Tests Flutter DevOps maturity: Codemagic YAML workflow configuration, Flutter flavor (flavour) setup with dart-define or .env, code signing with Codemagic's automatic signing, firebase_app_distribution or TestFlight for beta, Google Play API credentials for Play Store submission, and conditional branch triggering.
Red flag answer
I would build manually and upload to the stores. No CI/CD knowledge for Flutter.
Cannot explain their state management pattern
Uses Bloc or Riverpod but cannot draw the event/state flow or explain provider scoping. Widget knowledge without architecture knowledge is insufficient.
Has never shipped an app to the App Store or Play Store
Built demo and tutorial apps but has no production Flutter deployment experience. Production constraints (code signing, App Review, Play Store policies) require hands-on experience.
Uses setState everywhere at scale
setState is appropriate for isolated local state. Developers who use it for cross-widget and cross-screen state produce unmaintainable spaghetti Flutter code.
No Dart Isolate awareness
Runs CPU-intensive work on the main isolate, causing UI jank. Dart Isolate knowledge is essential for any Flutter app processing non-trivial data.
Cannot write a widget test
Never used testWidgets, WidgetTester, or pump/pumpAndSettle. Untested Flutter apps have unknown regression behaviour between releases.
Assumes pub.dev has a package for everything
Cannot design a custom platform channel or write native Swift/Kotlin code. Many production requirements need native integrations without an adequate pub.dev package.
| Region | Junior (1-3 yrs) | Mid (3-6 yrs) | Senior (6+ yrs) |
|---|---|---|---|
| South Asia | $30-50/hr | $50-75/hr | $75-100/hr |
| Eastern Europe | $50-75/hr | $75-110/hr | $110-140/hr |
| Latin America | $40-65/hr | $65-95/hr | $95-125/hr |
| South-East Asia | $30-50/hr | $50-80/hr | $80-110/hr |
| Western Europe | $80-110/hr | $110-140/hr | $140-175/hr |
| North America | $90-130/hr | $130-165/hr | $165-210/hr |
Rates are engineer rates before the OTF 15% management fee. Platform channel specialists and multi-platform (iOS + Android + Web + Desktop) engineers command a 10-20% premium. Flutter is a growing ecosystem -- top engineers are in high demand globally.
Published engineer rates before the OTF 15% management fee. Flutter rates are generally 10-20% below equivalent native iOS engineers due to the cross-platform efficiency gain.
Junior (1-3 yrs)
Basic Flutter widgets, limited production
Mid-level (3-6 yrs)
Bloc/Riverpod, Firebase, shipped apps
Senior (6+ yrs)
Architecture depth, multi-platform
Junior (1-3 yrs)
Solid Dart foundation, junior state mgmt
Mid-level (3-6 yrs)
Clean Architecture, Bloc or Riverpod
Senior (6+ yrs)
Platform channels, multi-platform architect
Junior (1-3 yrs)
Entry-level Flutter, some Firebase
Mid-level (3-6 yrs)
Production iOS + Android experience
Senior (6+ yrs)
Architecture, CI/CD, multi-platform
Junior (1-3 yrs)
Flutter basics, limited production
Mid-level (3-6 yrs)
Shipped apps, state management depth
Senior (6+ yrs)
Full architecture ownership
Junior (1-3 yrs)
CS background, strong Dart foundation
Mid-level (3-6 yrs)
Enterprise Flutter experience
Senior (6+ yrs)
Principal engineer, multi-platform lead
Junior (1-3 yrs)
Entry-level with mobile background
Mid-level (3-6 yrs)
Production Flutter, strong architecture
Senior (6+ yrs)
Staff/principal, Flutter + native depth
Platform channel / native integration specialist
+15-25%Flutter Web + Desktop (3+ platforms)
+10-20%Bloc + Clean Architecture + TDD
+10-15%Flutter performance engineering (DevTools, Impeller)
+10-20%Codemagic / CI/CD pipeline ownership
+10-15%HIPAA / GDPR compliant Flutter apps
+15-25%Flutter is a growing ecosystem with increasing enterprise adoption. Senior Flutter engineers with deep architecture and native integration experience are in high demand and short supply globally.
Flutter-specific vetting is the difference. A developer who built a single tutorial app and a developer who has shipped to 500K users are indistinguishable on Upwork -- not in our pool.
| Criterion | Open IT Freelancers | Toptal | Upwork | Staffing Agency |
|---|---|---|---|---|
| Vetting method | Live Dart + Flutter technical screen: architecture, state management, platform channels, DevTools profiling | Algorithm & coding tests -- limited Flutter-specific depth | Self-reported profile and portfolio | CV review, occasional take-home task |
| State management depth assessed | Yes -- Bloc, Riverpod, or Provider assessed per their claimed pattern | Not systematically assessed | Not assessed | Not typically assessed |
| App Store / Play Store history verified | Yes -- live app links verified where possible | Not verified | Not verified | CV claim only |
| Platform channel experience checked | Yes -- assessed if your brief requires native integrations | Not screened | Not screened | Not screened |
| Management fee | Flat 15% -- published in every contract | ~30-40% markup (undisclosed) | 10-20% platform fee on engineer | 25-40% markup, often undisclosed |
| Time to shortlist | 72 hours | 1-2 weeks | Immediate (unvetted) | 1-3 weeks |
| Matching fee | $0 | $0 (fee in rates) | $0 (fee in rates) | $0-5,000+ |
| Multi-platform screening (web + desktop) | Yes -- platform-specific experience verified | Limited | Not verified | Not typically verified |
| Replacement guarantee | 14-day free replacement | Trial period (varies) | No guarantee | Varies, often fee applies |
| Weekly delivery reporting | Yes -- dedicated account manager | Not included | Not included | Sometimes, at extra cost |
| Crash monitoring requirement | Yes -- Firebase Crashlytics setup required | Not managed | Not managed | Not enforced |
A mid-level Flutter engineer at $80/hr working 40 hrs/week for 16 weeks = $51,200 engineer cost.
Open IT Freelancers
$58,880
You pay $58,880 total
Toptal (est. 35%)
$69,120
~$10,240 more than OTF
Agency (est. 40%)
$71,680
~$12,800 more than OTF
Rates illustrative. OTF fee is published -- others are estimates based on typical market markups.
From HealthKit-integrated wellness apps to Windows/macOS enterprise tools, our Flutter engineers have shipped in regulated and consumer verticals alike.
Flutter advantage
Single codebase for mobile + tablet + desktop POS reduces time-to-market by 40-60% vs native-per-platform.
Flutter advantage
Flutter's platform channel architecture allows deep HealthKit/Fit native access without sacrificing a shared Dart codebase.
Flutter advantage
Flutter Web + mobile from one codebase suits consumer apps targeting both app stores and a web presence simultaneously.
Flutter advantage
Flutter Desktop is uniquely positioned for enterprise tools: ship the same app on macOS and Windows with 95%+ shared code.
Flutter Fintech App - iOS + Android + Web
Mid-level Flutter engineer needed for a digital wallet app. Must have experience with platform channels for biometric auth (FaceID + Fingerprint), Stripe SDK integration, Bloc for transaction state, and offline-first sync. Firebase Crashlytics and 3 flavours (dev/staging/prod) on Codemagic required. iOS + Android + web targets.
Flutter Healthcare - HealthKit + BLE Wearable
Senior Flutter developer for a health-tracking platform connecting iOS HealthKit, Android Google Fit, and BLE wearables via EventChannel. Requirements: custom Swift/Kotlin plugins, Drift local DB with AES encryption (HIPAA), offline-first architecture, and a shared Dart UI layer with custom chart animations.
Flutter Desktop - Windows + macOS B2B Tool
Senior Flutter engineer for a Windows/macOS SaaS dashboard for logistics teams. Must understand Flutter Desktop constraints: Win32 API access via platform channels, MSIX packaging, responsive layout system for varying screen sizes, fl_chart for live data, and Riverpod for cross-window state management.
Flutter vs React Native, platform channels, Bloc vs Riverpod, CI/CD pipelines -- the real questions clients ask before hiring.
Before You Hire
Written by our engineering team - no fluff, just the frameworks that work.
Developer rates by region, hidden cost breakdown, TCO comparison across DIY vs managed platforms, and a complete budgeting guide.
The 7-day vetting framework, technical interview questions, take-home test design, and red flags - built for non-technical founders.
Stage-by-stage decision framework for founders and CTOs. Cost, speed, and risk tradeoffs - with a clear verdict for each company type.
Our Vetting Funnel
Only the top 5% of Flutter applicants join our talent pool.
Submit your brief. Receive matched Flutter profiles within 72 hours. Flat 15% management fee -- no surprises.
72-hour shortlist
Matched Flutter profiles delivered within 72 hours of your brief
Live Dart screen
Every engineer passes a 90-min Flutter-specific technical assessment
14-day replacement
Free replacement within 14 days if the engineer is not the right fit
Flat 15% fee
Published in every contract -- no hidden markups or placement charges
State mgmt verified
Bloc or Riverpod depth assessed live -- not just self-reported
App Store verified
Production shipping history confirmed with live app links
Platform channels
Native integration capability assessed when your brief requires it
Crashlytics required
Firebase Crashlytics setup mandated for all production Flutter work
No placement fee. No lock-in contracts. 14-day free replacement guarantee.