Target Platforms
The supported platforms are defined according to the product requirements, including Android, iOS or cross-platform application environments.
Flutter App Development Services for Cross-Platform Products
Unisam Technologies provides Flutter app development services for businesses and product teams that want to build and maintain applications from a shared Flutter and Dart codebase.
We develop Flutter applications for iOS and Android with support for custom interfaces, backend APIs, authentication, device functionality, third-party integrations, testing and app store release preparation.
Our Flutter development work can cover new applications, existing Flutter products, migration projects and continued feature development.
Flutter Applications
Build iOS and Android Apps From a Shared Flutter Codebase
Flutter allows product teams to build application functionality for multiple platforms while sharing a significant portion of the codebase.
Instead of treating the product as two completely separate implementations, a Flutter project can maintain common application logic, interfaces, data handling and integrations while still allowing platform-specific behavior where the product requires it.
Unisam Technologies plans the Flutter architecture around the actual application requirements. This determines what can remain shared within Flutter and where platform-specific implementation is necessary.
Application Workflows
We review required user journeys, application flows and key actions to ensure the app supports the intended business processes.
User Roles
Applications can be structured around different user roles with specific permissions, access levels and workflows.
Backend Requirements
We connect applications with required backend systems for data management, business logic, authentication and application operations.
API Dependencies
Applications can integrate with required APIs for communication between the mobile application, backend services and third-party platforms.
Required Device Features
We can implement supported device capabilities such as camera, location, notifications, biometrics and other features required by the application.
Platform-Specific Functionality
Where required, applications can include functionality designed around specific platform capabilities, behaviors and technical requirements.
Application Data
We define how application data is stored, retrieved, processed and managed according to product requirements and supported architecture.
Authentication
Applications can include authentication systems such as user accounts, secure login flows, permissions and account management features.
Third-Party Integrations
We integrate required external services such as payment systems, analytics platforms, cloud services and business tools.
Release Requirements
We prepare applications according to required release processes, including build configuration, testing, version management and store submission requirements.
Our Flutter App Development Services
Our Flutter development services can cover the complete application build or a defined part of an existing Flutter product.
Custom Flutter App Development
We develop custom Flutter applications around defined business requirements, product workflows and user needs.
A Flutter application can include:
- User Accounts
- Custom Interfaces
- Dashboards
- Forms
- Data-Driven Screens
- Application Logic
- Backend Connectivity
- Notifications
- Payments
- Device Capabilities
- Third-Party Integrations
The application architecture is defined according to the functionality required by the product rather than beginning with a generic template.
Suitable for: businesses, startups and product teams that need a custom cross-platform application built with Flutter.
Flutter Mobile App Development
We build Flutter mobile applications for iOS and Android using a shared Dart codebase where appropriate.
The shared application can handle common:
- User Flows
- Business Logic
- Data Models
- Interface Components
- Backend Communication
- Account Functionality
- Integrations
Platform-specific requirements are handled separately where the iOS or Android environment requires different implementation.
Suitable for: products that need both iOS and Android applications without maintaining two completely separate application codebases.
Dart App Development
Flutter applications use Dart for application development.
We can use Dart to implement:
- Application Logic
- Data Models
- API Communication
- State Handling
- Validation
- Asynchronous Operations
- Reusable Functionality
- Interface Behavior
The structure of the Dart codebase is planned around the size and requirements of the application so that new functionality can be added without unnecessarily coupling unrelated parts of the product.
Flutter UI Development
Flutter provides a widget-based interface system that can be used to create custom application experiences from a shared codebase.
We implement approved Flutter interfaces with attention to:
- Navigation
- Reusable Widgets
- Responsive Layouts
- Application States
- Forms
- User Interactions
- Screen Transitions
- Platform Behavior
Where appropriate, the interface can account for differences between iOS and Android rather than forcing both platforms to behave identically.
Flutter Backend & API Integration
A Flutter application often depends on services outside the mobile codebase.
We can connect Flutter applications with supported:
- REST APIs
- Backend Systems
- Authentication Services
- Databases Through Appropriate Backend Services
- Cloud Platforms
- Payment Providers
- Analytics Systems
- Business Platforms
- Third-Party APIs
Before integration, we review the available API, authentication requirements, expected data and actions the Flutter application needs to perform.
Flutter App Migration & Modernization
Existing applications can be reviewed for migration or modernization with Flutter where there is a practical technical reason to do so.
The correct approach depends on the existing application, functionality, platform-specific requirements and long-term product plans.
Migration work can include:
- Rebuilding Selected Application Workflows
- Recreating Interfaces in Flutter
- Connecting The New Flutter Application to an Existing Backend
- Replacing Legacy Mobile Functionality
- Consolidating Duplicated Mobile Functionality
- Moving Features Gradually Where a Staged Approach is More Appropriate
A complete rewrite is not automatically required.
Existing Flutter App Development
We can work with existing Flutter codebases that require additional development.
This can include:
- New Features
- New Screens
- API Changes
- Interface Updates
- Package Updates
- Bug Fixes
- Platform Compatibility Work
- Performance Improvements
- Additional Integrations
- Release Preparation
The existing Flutter project is reviewed before changes are scoped so development can work with the current architecture where practical.
Flutter App Store Release Support
Flutter applications targeting iOS and Android still need to satisfy the technical and release requirements of each platform.
We can support the agreed release preparation for Apple App Store and Google Play
Release work can include:
- Production Build Preparation
- Application Configuration
- Signing Requirements
- Package or Bundle Preparation
- Versioning
- Release Testing
- Store Information Coordination
- Issue Resolution During Technical Submission Preparation
Final publication remains subject to the policies and review processes of Apple and Google.
Flutter Development With Dart
Flutter and Dart work together as the core technology foundation of a Flutter application.
01
Framework
Flutter
Flutter provides the framework, widget system and platform tooling used to build the application experience.
02
Programming Language
Dart
Dart is used to implement application logic, interfaces, data handling and other functionality inside the Flutter codebase.
03
Development Tools
Flutter SDK
The Flutter SDK provides the development tools and libraries required to build, test and compile Flutter applications.
04
Debugging Tools
Flutter DevTools
Flutter development tooling can be used to inspect application behavior and support debugging and performance investigation during development.
05
Reusable Components
Flutter Packages
Suitable Flutter packages can provide reusable functionality where an appropriate maintained solution already exists. Packages are reviewed according to the actual project requirements rather than adding dependencies simply because they are available.
Shared Flutter Code With Platform-Specific Integration When Required
Using Flutter does not mean every part of an application must behave identically on every platform. Some functionality may depend on capabilities or APIs that are specific to iOS or Android.
Flutter applications can use available plugins for supported functionality. Where an appropriate plugin does not meet the application's requirements, platform-specific implementation can be considered.
01
Camera
Access supported camera functionality for capture, scanning or other application workflows.
02
Location
Use device location services where required by the product.
03
Push Notifications
Connect the application with supported notification services.
04
Biometrics
Use supported biometric functionality for appropriate authentication workflows.
05
Maps
Connect mapping and location experiences required by the application.
06
File Access
Support approved document, image or media workflows.
07
Payments
Connect supported payment or billing functionality according to the application's requirements.
08
Native SDKs
Integrate supported third-party SDKs that require platform-specific configuration or implementation. The final approach depends on the target platforms and technical requirements of each feature.
Flutter Application Architecture & Codebase Planning
A shared codebase still requires a clear structure. As a Flutter product grows, tightly coupling screens, business logic, data access and external services can make future changes more difficult. We plan the Flutter project around distinct application responsibilities. Depending on the product, the architecture can separate areas such as:
Flutter Architecture Components
User Interface
Screens, widgets, navigation and application states.
Application Logic
Actions and workflows performed by users.
Data Models
The structures used by the application to represent information.
API Layer
Communication with backend and external services.
Authentication
Sessions, account access and user identity.
Local Data
Information that needs to be stored or cached on the device.
Platform Services
Functionality that depends on iOS, Android or device APIs.
Integrations
Connections with supported third-party systems.
Authentication Systems
Support account registration, login, sessions and approved user access.
REST APIs
Exchange application information with backend services.
Existing Web Platforms
Connect Flutter mobile functionality with an existing application or business platform.
Backend Services
Use server-side systems for application logic, data processing and protected functionality.
Cloud Services
Connect appropriate cloud functionality required by the application.
Firebase Services
Use selected Firebase services where they are appropriate for the product requirements.
Analytics Platforms
Capture defined application events and usage information.
Payment Providers
Connect supported payment functionality where required.
Third-Party APIs
Integrate external systems where suitable APIs, documentation and permissions are available. The integration architecture depends on the available services and the actions the Flutter application needs to perform.
Taking Over or Improving an Existing Flutter Application
A Flutter project does not have to begin with a new application. Existing Flutter products may need development because requirements have changed, backend services have evolved or the codebase requires technical improvement. We begin by reviewing the relevant parts of the existing project.
Add New Flutter Features
Implement approved screens, workflows and application functionality within the existing Flutter product.
Update Existing Interfaces
Improve selected screens, widgets, navigation or application states.
Update APIs
Modify application integration when backend endpoints, authentication or data structures change.
Review Flutter Packages
Update, replace or remove selected dependencies where required by the project.
Improve Application Structure
Refactor appropriate areas when the current implementation makes continued development difficult.
Update Platform Compatibility
Make required changes related to supported Flutter, iOS or Android environments.
Prepare New Releases
Support approved application updates through the required build and release process. The appropriate work depends on the current codebase and requested changes.
Our Flutter App Development Process
Each Flutter project is planned around its required platforms, users and functionality.
Flutter Product Requirements
We review the product purpose, target users, required platforms, functionality, backend systems and integrations.
Application Scope & User Flows
We define the required screens, workflows, user states and actions included in the application.
Flutter Technical Planning
We plan the Flutter codebase, Dart application structure, API dependencies, data requirements and platform-specific functionality.
Flutter Interface Development
Approved interfaces and navigation are implemented using reusable Flutter components where appropriate.
Application Logic & Integration
We build the required application functionality and connect supported APIs, authentication services and external systems.
Cross-Platform Testing
The required application workflows are reviewed on the iOS and Android environments included within the agreed project scope.
Release Preparation
Production builds and required platform configuration are prepared for the agreed distribution process.
Continued Flutter Development
Where included, the product can continue with approved fixes, updates and additional functionality after release.
Testing Flutter Apps Across iOS & Android
Sharing application code does not remove the need to test each target platform. iOS and Android can differ in areas such as permissions, device capabilities, navigation behavior, platform integrations, notifications, build configuration, external SDKs, store requirements. The Flutter testing scope can therefore include:
Functional Testing
Verify that required application workflows operate according to the approved specification.
iOS Testing
Review required functionality on the supported iOS environments included in the project.
Android Testing
Review required functionality on the supported Android environments included in the project.
Interface Testing
Check required layouts and application states across representative devices.
API Testing
Verify communication between Flutter and required backend services.
Authentication Testing
Review account, login, session and access workflows.
Platform Integration Testing
Check features that depend on iOS or Android APIs and external SDKs.
Application State Testing
Review defined loading, empty, success, error and offline states where applicable.
Release Build Testing
Review production builds before app store submission preparation.
The final testing matrix depends on the application's users, target platforms and required functionality.
Flutter App Development Cost & Timeline
The cost and timeline of Flutter app development depend on the actual product scope.
Using Flutter does not make every application the same size or complexity. A useful estimate needs to account for the required functionality and systems behind the application. Unisam Technologies reviews these requirements before defining the Flutter development scope and preparing a project estimate.
Application Functionality
The number and complexity of required workflows, screens and modules.
Target Platforms
Whether the Flutter application targets iOS, Android or additional supported environments.
Interface Requirements
The complexity of custom widgets, navigation, responsive layouts and application states.
Backend Requirements
APIs, databases, administration systems and server-side functionality required by the application.
User Accounts
Authentication, profiles, roles and permissions.
Third-Party Integrations
Payments, maps, analytics, external APIs and other connected platforms.
Native Platform Features
Features that require additional iOS or Android configuration or implementation.
Existing Codebase
Whether the project begins with a new Flutter application or development within an existing product.
Migration Requirements
The work required when moving functionality from an existing application into Flutter.
Testing Scope
The devices, platforms, workflows and integrations included in testing.
Release Requirements
Preparation required for the Apple App Store, Google Play or another approved deployment target.
Why Work With Unisam for Flutter App Development?
Unisam Technologies approaches Flutter development as part of a complete software product rather than only building application screens. Founded in 2017, our broader development work includes mobile applications, web applications, SaaS products, backend systems, APIs and connected software platforms.
Flutter App Development FAQs
Ready to Build or Improve Your Flutter App?
Tell us about your application, target platforms, users, required features and existing systems. Unisam Technologies can review your requirements and help define the appropriate Flutter development scope for a new cross-platform application, an existing Flutter product or a migration project.
