Two teams. Two release cycles. iOS always ahead, Android always behind. The drift cost a week per quarter, every quarter, and nobody had time to fix the cause.
Service Flutter development services · Flutter 3 · UK
Flutter development for the iOS + Android app that ships. from one codebase.
Flutter development for UK founders, brands, and SaaS teams. Flutter 3 apps that pass App Store review on submission one, run smooth on the iPhone SE 2020, and ship both stores from one codebase — with native bridges for BLE, biometrics, and Apple Pay when the brief earns them.
18Flutter apps shipped since 2019
96%App Store first-pass rate
60fpsfloor on iPhone SE 2020
(Why CTOs sign)
You don’t need another Flutter 3 team. You need engineers who’ve shipped 18 apps and watched what breaks at scale.
One codebase. Paired releases. The same Flutter UI on both stores, shipped the same day. We build for the iPhone SE in your customer’s pocket, not the M3 on our desk.
0
96%
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The CTO this page is for12fps · rejected build · 1 week drift / quarter
Marcus shipped iOS and Android natively. iOS ahead. Android always behind.
Then a customer tested on an iPhone SE. The list scroll dropped to 12fps. The team had been profiling on M3 MacBooks and Pixel 8 Pros. The Apple reviewer hit the same jank and rejected the build.
We rebuilt the app in Flutter over twelve weeks. One codebase. Paired releases. Both stores ship the same day. App Store first-pass on submission one. This page is for CTOs who recognise themselves in that paragraph.
The stack we ship every Flutter build on.
Flutter 3 plus Dart 3 handles the app. A MERN + AWS backend handles everything behind it. One codebase ships both stores.
T1
What every Flutter 3 build runs on
Flutter 3Flutter 3.24+Dart 3Riverpod / BlocGoRouterDio + RetrofitDrift / Hive / IsarFirebase AuthSentry FlutterFastlane + CodemagicMixpanelLottie + Riveintegration_test
T2
When your Flutter brief calls for it
reach when neededSwift (native bridge)Kotlin (native bridge)PythonNode.js + ExpressGraphQLtRPC
T3
The infrastructure layer
AWS-defaultAWSMongoDB AtlasAWS RDS / AuroraAWS LambdaS3 + CloudFrontRedisDockerTerraformGitHub ActionsDatadog + SentryCrashlyticsFirebase
UK Flutter 3 development studio · senior-only
Six things in-house teams and offshore shops can’t hand you
The engineering discipline that separates a Flutter demo from a Flutter app your acquirer can defend.
Impeller + 60fps discipline
Frame budget enforced. Jank caught in DevTools profile before the PR lands. The floor device is the iPhone SE 2020 + Pixel 4a, never our M3.
State management chosen, not defaulted
Riverpod for new builds. Bloc when the team is Bloc-deep. Provider only on legacy. The state pattern lives in an ADR, so the next engineer follows it.
Native modules when they earn it
BLE, biometrics, Apple Pay, ARKit and ARCore stay native. We bridge through typed platform channels. No fighting the platform to save a week.
App Store + Play Store discipline
Privacy manifest, entitlements, and signing audited before week one. First-pass review rate 96% and up across our mobile builds.
Senior-only, no juniors
The four engineers who sign your scope are the four who ship. Senior Flutter is rare. We bring it, and your senior hire reads the repo and stays.
30-day walk-away both ways
You keep everything. IP assigns on every commit. No lock-in, no deposit forfeiture, no clever stack nobody else can maintain.
How a Flutter build runs
From brief to both stores, one codebase
Six steps, every Flutter 3 build. Day-1 decisions land in ADRs, the floor device is the iPhone SE 2020, and both stores ship the same day.
Step-01
Audit week
5-day senior audit. Architecture, perf, scale, and the hire path mapped. Render-boundary map plus ADRs, then a signed scope in line-item GBP.
Step-02
State pattern, ADR-locked
Riverpod for new builds, Bloc when the team is Bloc-deep, Provider only on legacy. The pattern lives in an ADR so the next engineer follows it.
Step-03
Native bridges where they earn it
BLE, biometrics, Apple Pay, ARKit and ARCore stay native behind Pigeon-generated typed channels. Errors caught at the bridge, logged to Sentry.
Step-04
60fps on the floor device
Impeller rendering. DevTools timeline gated in CI. If a frame blows the 16ms budget on the iPhone SE 2020, the build doesn’t ship.
Step-05
Store discipline before week one
Privacy manifest, entitlements, and signing audited up front. Foreground-service types declared for Android 14. App Store first-pass review.
Step-06
Paired releases, both stores
Sentry plus Crashlytics from day one, breadcrumbs on every route. iOS and Android ship the same day from one codebase.
Results
Native iOS + Android
Native iOS + Android
to Flutter, in numbers
UK B2B SaaS, 1,800 customers. We consolidated two native apps (Swift plus Kotlin, four engineers) into one Flutter codebase run by two, with native bridges for BLE, biometrics, and Apple Pay. Sixteen-week sprint. By week 14, 92% of screens were Flutter and feature velocity had doubled.
The consolidation
21
Codebases after rebuild
42
Engineers to maintain it
Velocity + parity
2×
Feature velocity after week 14
same day
iOS + Android ship parity
Track record
18
Flutter apps since 2019
96%
App Store first-pass rate
Flutter development services
Where senior Flutter actually shows
Five places the engineering discipline separates a Flutter demo from an app your acquirer can defend.
Performance(01)
Impeller + 60fps discipline
Frame budget enforced and jank caught in the DevTools profile before the PR lands. The floor device is the iPhone SE 2020 plus the Pixel 4a, never our M3.
ImpellerDevTools timeline16ms budgetiPhone SE 2020
Impeller + 60fps discipline
Architecture(02)
State management chosen, not defaulted
Riverpod for new builds, Bloc when the team is Bloc-deep, Provider only on legacy. The state pattern lives in an ADR so the next engineer follows it.
RiverpodBlocGoRouterADR-locked
State management chosen, not defaulted
Native(03)
Native modules when they earn it
BLE, biometrics, Apple Pay, ARKit and ARCore stay native. We bridge through Pigeon-generated typed platform channels and catch errors at the bridge.
BLEBiometricsApple PayPigeon channels
Native modules when they earn it
Release(04)
App Store + Play Store discipline
Privacy manifest, entitlements, and signing audited before week one. Foreground-service types declared for Android 14. First-pass review rate 96% and up.
Privacy manifestCodemagicFastlaneShorebird OTA
App Store + Play Store discipline
Observability(05)
Crash visibility from day one
Sentry with user, device, and route context. Crashlytics for native crashes. Breadcrumbs capture the path so on-call reproduces it in five minutes.
Sentry FlutterCrashlyticsBreadcrumbsGolden tests
Crash visibility from day one
Three ways to start. Pricing in the email back.
Pick the shape that fits and Mohit will send your real number inside 24 hours.
Flutter 3 audit week
5 days, £8K fixed. We audit your existing app or a new brief: architecture, perf, scale, and the hire path.
- 5-day senior audit
- Render-boundary map + ADRs
- Signed scope, line-item GBP
- No commitment to build
Full Flutter build sprint
10 to 16 weeks of fixed-scope shipping. Flutter 3 + Dart 3 + Riverpod + Codemagic + Sentry. App Store and Play Store first-pass review.
- Flutter 3 + Riverpod + Codemagic
- Two senior engineers paired
- 30-day walk-away both ways
- IP assigns on every commit
Native Flutter rebuild
8 to 12 weeks. Take your native iOS plus Android apps and rebuild on Flutter. Behind-flag cutover. Performance and cost targets locked in scope.
- Native iOS + Android Flutter
- Native bridges (BLE, Pay, biometrics)
- Screen-by-screen cutover
- Crash-free + cold-start targets locked
“The Flutter rebuild was the right bet. Hire-to-productive timeline halved. Senior interviews open the repo and stay.”
— Marcus H., VP Engineering, UK FinTechWhat CTOs actually ask before signing
Pain-first, soft-second.
We default to the patterns the Flutter community has settled on for production: Riverpod for state, GoRouter for navigation, typed platform channels for native, observability from day one, and golden tests against render regressions. If you have a strong reason to deviate, we’ll discuss it in the audit week. The state pattern always lands in an ADR so your next engineer follows it.
Flutter most of the time. One rendering engine across both stores means pixel parity and a 60fps floor we can enforce. React Native if you already have a strong React web team that will maintain the mobile app long term. We’ll have the honest conversation in audit week. The wrong call costs you a rebuild, so we don’t make it lightly.
Our floor device is the iPhone SE 2020 plus the Pixel 4a, not the M3 on our desk. The DevTools timeline is gated in CI. We use Impeller rendering and profile on real low-end hardware before every release. If a frame blows the 16ms budget on the SE, the build doesn’t ship.
Yes. We’ve done it for UK clients in 2025. Your existing backend (Rails, Django, .NET, Java, Go) stays. We build the Flutter app with typed contracts against your API. You get senior-grade Flutter without rebuilding the backend you already trust.
The hard native bits stay native. BLE, biometrics, Apple Pay, ARKit and ARCore live behind Pigeon-generated typed platform channels. Errors get caught at the bridge and logged to Sentry with the platform stack. We don’t fight the platform to save a week, we bridge it cleanly.
30-day walk-away both ways. Milestone billing 25/25/25/25. UK VAT registered, listed on Companies House, shipping since 2019. You’re never more than four weeks at risk of paying for nothing.
Every Flutter project has two senior engineers paired, not one. Every decision goes into an ADR the same day. Mohit reviews every PR. In seven years, two engineers have left mid-project. Both handovers were inside 48 hours, and neither client noticed.
Yes, with 14 days’ notice. Engineers move to other projects. Spend pauses. Resume with 14 days’ notice. No cancellation fee. No restart fee.
In context
What it looks like shipped.
flutter development, in context — the dashboards, flows and components your team actually ships, reviews and maintains.
One paragraph. That’s it.
Tell us what the app does, who uses it, and which device half your customers actually carry. Mohit replies inside 24 hours: a clear yes, a clear no, or the one question that decides it.
What happens after the email lands
- < 24h
A personal reply.
Yes, no, or the deciding question. Straight to your inbox.
- Week 1
Audit week begins.
Architecture, state pattern, store strategy, observability plan, signed scope.
- Launch
Both stores, one codebase.
First-pass review. 60fps on the iPhone SE. Paired releases the same day.