Cross-platform Flutter apps
iOS 14+, Android API 24+, web (canvaskit and html renderers), Windows, macOS and Linux desktop from one Dart codebase. Material 3 and Cupertino widgets adapted per platform.
Services
Flutter App Development Services for US & EU Mobile, Web and Desktop Products
Senior Flutter and Dart engineering for funded mobile teams: Flutter 3.27 with Dart 3.6, Riverpod 2 or Bloc 8 state, GoRouter 14, Drift or Isar local persistence, FFI for native iOS / Android plugins, melos-managed monorepos, and CI on Codemagic, GitHub Actions or Bitrise that ships TestFlight and Play internal tracks every commit. One codebase to iOS, Android, web and desktop — without compromising on the native feel users actually notice. Dedicated teams from 12,000 EUR/month, project sprints from 25,000 EUR.
Flutter wins when your product needs identical UX across iOS and Android (and increasingly web and desktop), when you cannot afford two separate native teams with different release cadences, and when your designers want pixel-precise custom UI rather than the platform-default look. We use it where it earns its place: B2C consumer apps with strong brand-driven UI, B2B field-service and logistics apps where iOS + Android parity is a contractual requirement, and white-label products where one codebase powers fifty branded apps. Our Flutter engineers average 6+ years on Dart, have shipped apps with 5M+ MAU on the Play Store and App Store, and know which Flutter packages to never use in production. We are GDPR-aligned · ISO 27001 ready · SOC 2 Type II in progress.
What we build with Flutter
State + navigation architecture
Riverpod 2 with code generation, or Bloc 8 with hydrated_bloc, GoRouter 14 with type-safe routes, freezed for sealed unions, dio or http for networking with retry interceptors.
Native integration + FFI
Custom platform channels in Swift / Kotlin, Dart FFI for direct C/C++ interop (encryption libraries, ML runtimes, hardware SDKs), pigeon for type-safe codegen of native bridges.
Auth + secure storage
Firebase Auth, Auth0, Supabase, Cognito, custom OIDC. flutter_secure_storage backed by Keychain and Keystore, biometric prompts via local_auth, certificate pinning for high-trust contexts.
Offline-first + sync
Drift (SQLite) or Isar for local persistence, PowerSync or custom CRDT sync, background sync via WorkManager (Android) and BGTaskScheduler (iOS), conflict resolution patterns that survive 30-day offline gaps.
Flutter modernisation
Migrating Flutter 2.x / 3.0–3.10 onto Flutter 3.27, null-safety completion, Provider / setState onto Riverpod 2, Navigator 1 onto GoRouter, single repo onto melos workspace with shared design system.
Stack and tooling
Flutter 3.27
Dart 3.6
Riverpod 2
Bloc 8
GoRouter 14
freezed
Dio
Drift
Isar
Hive
Firebase
Supabase
Sentry
Codemagic
Fastlane
melos
Pigeon
Dart FFI
Material 3
Cupertino
How an engagement runs
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01
Discovery
1–2 weeks: audit existing repo (or Figma file), decide Riverpod vs Bloc, decide GoRouter vs auto_route, decide REST vs GraphQL, decide Firebase vs custom backend, and write the ADR before code lands.
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02
Foundation
Sprint 1–2: melos monorepo with app + design_system + api_client + shared packages, very_good_analysis lints, golden tests via alchemist, CI on Codemagic or GitHub Actions, Fastlane for App Store / Play release.
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03
Build
Two-week sprints, trunk-based, Firebase Remote Config or ConfigCat for feature flags, widget tests + integration_test driver + golden tests, Sentry for crash reporting from day one.
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04
Operate
TestFlight and Play internal track on every merge, weekly external beta, store-listing optimisation, Sentry triage on-call rotation, monthly review of crash-free sessions and ANR rate, quarterly Flutter / Dart SDK upgrade.
Engagement models
Dedicated team
2–6 senior engineers embedded in your roadmap, daily standup in your channel, your repo, your CI, your on-call. Best for product roadmaps with a 6+ month horizon. From 12,000 EUR/month.
Project sprint
Fixed-scope, fixed-budget delivery: discovery + MVP + App Store and Play release. Best for new product lines, validated PoCs that need hardening, and stand-alone modules. From 25,000 EUR.
Staff augmentation
One or two senior engineers slotted into your existing squad, your stand-up, your process. Best for filling a known capability gap without disturbing team structure. From 7,500 EUR/month per engineer.
Three-month minimum on all tiers, month-to-month thereafter with 30 days notice. NDA, DPA, and IP assignment signed before kickoff.
Selected related work
FinTech · Crypto · Mobile
Crypto Wallet
Flutter iOS + Android companion for a custodial platform — biometric unlock, P2P transfers, fiat-crypto bridge, in-app exchanger.
HealthTech · Nutrition
BasilDoc
Cross-platform diet and meal-planning app on Flutter — calorie engine, recipe library, weekly meal-plan, grocery ordering.
Why US & EU teams pick YuSMP for Flutter app development
GDPR-aligned · ISO 27001 ready · SOC 2 Type II in progress · HIPAA-capable · CCPA-acknowledged
Senior engineers, not body shop
Every engineer on your account has 5+ years of production Flutter / Dart experience and a published app on the App Store and Play Store. No bait-and-switch from the senior who sold the deal.
CET workday + US overlap
CET-aligned squads with a guaranteed 9 AM–1 PM ET overlap for US clients — four hours of synchronous work per day, async docs for the rest. No 3 AM standups for anyone.
Compliance-fluent delivery
GDPR DPAs, SOC 2 Type I/II readiness, HIPAA controls for US healthtech, CCPA notices, App Store Privacy Manifests, Play Data Safety. The compliance work is built into the sprint, not bolted on before submission.
For regulated workloads we work directly with your auditor or fund's technical advisor and prepare evidence to the standard the reviewer expects — not the standard a generalist consultant assumes.
Frequently asked questions
Why pick Flutter in 2026 over React Native, native Swift/Kotlin, or Kotlin Multiplatform?
Flutter wins when pixel-perfect cross-platform UI parity matters more than feeling 100% native, when you want one team shipping iOS and Android (and web/desktop) from one repo, and when your design system is custom rather than platform-default. React Native wins when your team already lives in TypeScript and your app is mostly screens-on-top-of-APIs. Native Swift/Kotlin wins for AR/VR, deep OS integration, and apps with platform-specific UX expectations (e.g. iOS-only premium consumer apps). Kotlin Multiplatform wins when you want to share business logic but keep native UI — great for existing native teams adding code sharing without committing to one UI framework. We have shipped on all four and will tell you honestly during discovery.
Which Flutter and Dart versions do you standardise on?
Flutter 3.27 stable with Dart 3.6 as of 2026. Material 3 default for Android-leaning brands, Cupertino with adaptive widgets for iOS-leaning. Minimum supported iOS 14, Android API 24 (covers 99%+ of devices in EU and US markets). We pin Flutter SDK per-project via fvm so every contributor and CI runs the same exact build. Quarterly SDK upgrade reviews — we never sit on a Flutter version more than two minor releases behind stable in production.
Do you handle EU data residency, GDPR, App Store and Play privacy requirements?
Yes. Backend defaults to EU regions (AWS eu-central-1, GCP europe-west3, Supabase eu-central-1) with KMS keys held in the customer account. We ship App Store Privacy Manifests (mandatory from May 2024) declaring every required-reason API and SDK data collection. Play Data Safety section completed against the actual SDK inventory. GDPR consent via UMP (Google) or custom CMP integrated with our analytics and crash-reporting stack. Apple ATT prompt where IDFA is needed. Anonymous identifiers default, PII opt-in only.
How do you handle offline-first sync for field-service / logistics apps?
Drift (SQLite) or Isar as the local store, with our own sync layer or PowerSync when the customer wants managed sync. Conflict resolution defaults to last-write-wins on simple records and operational transforms or CRDTs on collaborative data. Background sync via WorkManager (Android) and BGTaskScheduler (iOS) on a 15-minute cadence with exponential backoff on failure. We have shipped a field-service app that survived a 27-day offline gap (vessel at sea) and synced 14 GB of inspection data on reconnect without a single conflict requiring manual resolution.
Can you migrate a Flutter 2.x or pre-null-safety codebase to Flutter 3.27?
Yes, this is a common engagement. Step 1: get the test suite green on the existing version. Step 2: complete null-safety migration (most teams stopped 80% in). Step 3: stepwise SDK upgrade 2.10 → 3.0 → 3.10 → 3.19 → 3.27 with green tests at each step. Step 4: replace deprecated APIs (RaisedButton → ElevatedButton, AccessibilityFeatures, BottomNavigationBar themes). Step 5: introduce Riverpod 2 or Bloc 8 alongside existing Provider/setState, migrate per feature. Typical 80k-LOC app takes 3 to 5 months without a feature freeze.
What does pricing look like for a Flutter dedicated team or project sprint?
Dedicated teams start at 12,000 EUR/month for a 2-engineer pod (typically 1 senior + 1 mid plus fractional tech lead and DevOps). Standard mobile squads are 4–6 engineers at 28,000–42,000 EUR/month with QA on real-device farm, DevOps for store releases, and PM. Fixed-scope project sprints (discovery + MVP + App Store and Play release) start at 25,000 EUR. All engagements include CET workday with 9 AM–1 PM ET overlap for US clients, NDA + DPA + IP assignment signed before kickoff, three-month minimum, then month-to-month with 30 days notice.