Save an old Flutter project!

Overview
I am seeking an experienced Flutter developer to breathe new life into an older Flutter application. The project involves updating the app to the latest Flutter framework, implementing best practices, and resolving existing bugs to ensure optimal performance and user experience.
Project Scope

App Evaluation: Conduct a thorough assessment of the existing Flutter application, identifying outdated dependencies, deprecated code, and areas for improvement.
Flutter Version Update: Migrate the application to the latest stable version of Flutter, ensuring compatibility with current best practices and performance standards.
Code Refactoring: Restructure and optimize the existing codebase, improving readability, maintainability, and scalability.
Bug Fixing: Identify and resolve all existing bugs, including UI glitches, performance issues, and functionality errors.
Dependency Management: Update all third-party libraries and packages to their latest compatible versions, replacing any deprecated dependencies with modern alternatives.
Performance Optimization: Implement performance enhancements to improve app speed, responsiveness, and resource utilization.
UI/UX Refinement: Modernize the user interface and enhance user experience while maintaining the app's core functionality and brand identity.
Testing and Quality Assurance: Develop and execute a comprehensive testing strategy, including unit tests, integration tests, and UI tests to ensure the app's stability and reliability.
Documentation: Create or update technical documentation, including setup instructions, architecture overview, and code comments for future maintenance.
Deployment: Assist in preparing the updated app for deployment to relevant app stores and ensure smooth transition for existing users.

Required Skills and Experience

Proven experience with Flutter development, including experience with older Flutter versions
Strong knowledge of Dart programming language
Familiarity with state management solutions in Flutter (e.g., Getx)
Experience in debugging and performance optimization for mobile applications
Understanding of mobile app architecture and design patterns
Proficiency in version control systems, preferably Git
Ability to write clean, maintainable, and efficient code
Experience with automated testing in Flutter

Deliverables

Updated and fully functional Flutter application
Comprehensive bug fix report
Updated source code with proper documentation
Test suite for ongoing quality assurance
Deployment-ready application builds for iOS and Android platforms