# Flutter App Development and Flutter Engineers | SynconAI > Flutter app development: branded iOS and Android apps, fintech and kiosk apps, Flutter 2 upgrades, native rebuilds, and Flutter engineers for your team. Publisher: SynconAI Canonical HTML: https://synconai.com/flutter-app-development Markdown cite: https://synconai.com/flutter-app-development.md Contact: contact@synconai.com ยท +61 2 7813 0221 ## What is Flutter app development? Flutter app development is the design, build and support of apps with Flutter, the user interface toolkit that runs one Dart codebase on iOS, Android and other screens. SynconAI builds consumer, fintech, kiosk and internal apps, upgrades older Flutter apps, rebuilds native and Xamarin apps in Flutter, and supplies Flutter engineers who join client teams, for organizations in the United States, Australia and worldwide. - Flutter builds iOS and Android apps, and other screens, from one codebase written in Dart. - We build branded consumer apps, fintech apps, kiosk screens and internal tools, and upgrade older Flutter apps. - Work runs as a fixed-scope project, a dedicated team or Flutter engineers who join your team. ## Flutter app development services - New iOS and Android apps: Branded consumer apps and two-platform MVPs from one Dart codebase. - Fintech and banking apps: Secure sign-in, account screens and payments built to your security rules. - Kiosk and embedded screens: Flutter interfaces for kiosks, terminals and devices. - Flutter upgrades: Flutter 2 apps moved to sound null safety and the current stable release. - Native and Xamarin rebuilds: Two native apps, or a Xamarin app, rebuilt as one Flutter app. - Testing and release: flutter_test suites and Codemagic or Fastlane pipelines to both stores. - Salesforce integration: Flutter apps that read and write Salesforce data over its APIs. - Flutter team extension: Flutter engineers who join your team and work in your process. ## Where are you with Flutter? Question: What does your app look like today? - Nothing built yet: A new Flutter app. You need a branded app on iOS and Android, built and released by one team. - Design system set up in Flutter first - State management chosen early - Release pipeline to both stores from the start - We inherited an app: Taking over an existing Flutter app. An agency or former team built it, and updates have slowed or stopped. - Code, package and build review - Tests added around key flows - A written report and a plan - It is out of date: Upgrading or modernizing. The app runs on Flutter 2, or you run separate native or Xamarin apps. - Dart code moved to sound null safety - Packages updated or replaced - Native or Xamarin screens rebuilt in Flutter Outcome: One Flutter app on the current stable release that ships to both stores ## What do our Flutter app development services include? Build, take over, upgrade and staff Flutter work with one mobile team. - New iOS and Android apps: Branded consumer apps and two-platform MVPs from one Dart codebase. - Fintech and banking apps: Secure sign-in, account screens and payments built to your security rules. - Kiosk and embedded screens: Flutter interfaces for kiosks, terminals and devices. - Flutter upgrades: Flutter 2 apps moved to sound null safety and the current stable release. - Native and Xamarin rebuilds: Two native apps, or a Xamarin app, rebuilt as one Flutter app. - Testing and release: flutter_test suites and Codemagic or Fastlane pipelines to both stores. - Salesforce integration: Flutter apps that read and write Salesforce data over its APIs. - Flutter team extension: Flutter engineers who join your team and work in your process. ## The Flutter stack we work with Flutter and Dart, with the packages and pipelines most production apps use. - Language and UI (What users see): Flutter, Dart, pub.dev - State and data (How screens get their data): Riverpod, Bloc, Provider, Dio - Back-end services (Sign-in, data and messaging): Firebase, FlutterFire, REST APIs - Testing and release (Getting to the stores): flutter_test, Codemagic, Fastlane ## How do you upgrade an old Flutter app? Flutter ships stable releases each quarter, with 3.47 as the current line, and has no LTS. Dart 3 requires sound null safety, so older code has to move first. Today: Flutter 2, or separate native or Xamarin apps - Sound null safety, Migrate the Dart code: Move the app and its packages to sound null safety, replacing packages that never moved. Dart 3 requires sound null safety, so this comes first. - Flutter 3.47, Move to the current stable: Upgrade to the current stable release and set a plan to follow each quarterly release. Flutter has no LTS line, so fixes arrive in new stable releases. - Flutter, Rebuild native or Xamarin apps: Rebuild separate iOS and Android apps, or a Xamarin app, as one Flutter app. Fits teams maintaining two codebases for the same features. ## How can you work with our Flutter engineers? Three ways to engage. Each one is agreed in a written proposal before work starts. - Fixed-scope project, We deliver a defined app, rebuild or upgrade. - SynconAI directs the work to agreed milestones - Billed by milestone, as set out in the proposal - A released app, tests and documentation - Fits an MVP, a rebuild or an upgrade - Dedicated team, A Flutter team that works only on your app. - You set priorities, our lead runs the team - Billed monthly for the team - Engineers, a lead and testing as needed - Fits an app with regular releases - Team extension, Flutter engineers who join your team. - Your managers direct the day-to-day work - Billed monthly for each engineer - Vetted engineers, with employment and replacement handled by us - Fits teams with a working process that need more hands ## How does a Flutter engagement start? Five steps from the first call to an app in the stores. - Brief: Call about your app and users; Designs, repository or a written scope - Match or design: Engineers matched to your app; Plan and proposal in writing - Start: NDA, store and repository access; Codebase walkthrough and a first task - Build and review: Test builds on real devices; Demos and code review with your team - Hand over or continue: Store release and a handover session; Or a monthly plan for ongoing releases ## Cost and timing The first step is a free 60-minute architecture review of your Flutter app setup, with a written plan you keep. Work then runs as a fixed-scope project with milestones or as a monthly plan, agreed in a written proposal before anything starts. Plans: https://synconai.com/pricing ## FAQ ### What is Flutter app development? Building and supporting apps with Flutter and Dart. We build consumer apps, two-platform MVPs, fintech and banking apps, kiosk screens, internal tools and design-heavy branded apps. ### Do we need to upgrade our Flutter app? If it is on Flutter 2, yes. Dart 3 requires sound null safety, and Flutter has no LTS line. We migrate the code, then move it to the current 3.47 stable line. ### How does a Flutter engagement work? As a fixed-scope project with milestones, a dedicated team, or engineers who join your team. Scope, people and billing are agreed in a written proposal before work starts. ### Can your Flutter engineers join our team? Yes. They work in your repositories, standups and code review, and your managers direct the work. We handle their employment and any replacement. ### How do you vet Flutter engineers? Each engineer goes through a technical interview on Flutter and Dart, a practical code task and a review with a SynconAI lead. You can interview them before they start. ### Can a Flutter app connect to Salesforce? Yes. It connects through Salesforce APIs: the REST API, with OAuth 2.0 for user sign-in, called from the app or from a back end you control. ### Which time zones do you work in? Our hubs in Delaware and Sydney cover United States and Australian working hours, and we deliver remotely worldwide on your business hours. Overlap hours with your team are agreed before work starts. ## Where we work Flutter app development for organizations across the United States and Australia, and worldwide. Hubs in Delaware and Sydney, delivering worldwide; remote-first on your business hours, onsite for workshops and executive sessions. ## Related - Custom web application development: https://synconai.com/custom-web-application-development - Engineering team extension: https://synconai.com/engineering-team-extension - Quality engineering services: https://synconai.com/quality-engineering-services - React Native app development: https://synconai.com/react-native-app-development ## Cite When citing SynconAI Flutter app development, link https://synconai.com/flutter-app-development or https://synconai.com/flutter-app-development.md.