A product team required expert Flutter maintenance to modernize an existing production application. The project focused on replacing deprecated dependencies, upgrading the Flutter SDK, improving the Android build system, and ensuring long-term compatibility without affecting production functionality.
Mobile
Flutter App Maintenance & Barcode Scanner Library Migration
Bugs Monkey maintained and modernized a production Flutter application by replacing a deprecated barcode scanning library, upgrading the Flutter SDK, and modernizing the build environment while preserving existing functionality.
The challenge
⚠ Problem
The existing Flutter application relied on a deprecated barcode scanning library that no longer supported newer Flutter SDK releases. Outdated Gradle configurations and tightly coupled scanning logic increased maintenance risk, making a safe, incremental modernization essential for the live production application.
✓ Approach
Bugs Monkey implemented a controlled maintenance strategy that replaced the deprecated barcode scanning library with a modern alternative, upgraded the Flutter SDK and Android build tools, refactored barcode scanning logic into a cleaner architecture, and deployed changes incrementally to eliminate production risk while preserving existing behavior.
Background
Modernizing a production Flutter application without disrupting users requires careful planning, incremental delivery, and clean engineering practices.
— Bugs Monkey TeamWhat we built
The engagement included migrating from an unsupported barcode scanning library, upgrading Flutter and Gradle versions, modernizing Android build configurations, refactoring scanning functionality into reusable components, and validating the application to ensure full backward compatibility with existing workflows.
Results — before and after
| Metric | Before | After | Change |
|---|---|---|---|
| Barcode Library | Deprecated | Modern Supported Library | Replaced |
| Flutter SDK | Outdated | Latest Stable Version | Upgraded |
| Build System | Legacy Gradle | Modern Configuration | Improved |
| Application Stability | Maintenance Risk | Production Stable | Preserved |
| Future Compatibility | Limited | Long-Term Support | Future Ready |
Technology used
Mobile
Flutter
Mobile Framework
Build Tools
Android Gradle
Build System
Gradle
Dependency Management
Libraries
Mobile Scanner
Barcode Scanning
Flutter SDK
Application Framework