Flutter Developer for Codebase Migration

@corpmember29

((FLUTTER)) I have 10+ years of software development experience, including strong hands-on experience with Flutter/Dart, production mobile applications, APIs, Firebase, authentication, notifications, third-party integrations, and Android/iOS deployment. I understand that this is not a simple code-copying migration. I will first analyze the existing architecture, dependencies, business logic, data flow, and integrations, then identify what should be transferred, refactored, rebuilt, or removed. I will protect existing functionality through incremental migration, testing, regression checks, and careful validation before changes move forward. I am experienced with Bloc/Cubit, Provider and Riverpod, REST APIs, Firebase, Git/GitHub, local/secure storage, Gradle, CocoaPods, Xcode, Play Store and App Store releases. I am comfortable learning an unfamiliar architecture and taking ownership of the new codebase long-term. I can provide relevant Flutter work examples and discuss my previous migration experience directly. I am available full-time during 8:00 AM–5:00 PM U.S. Eastern Time and can commit to a long-term position. I WILL PROVIDE 2 YEARS FREE ONGOING SUPPORT AND COMPLETE SOURCE CODE. WE WILL WORK WITH AGILE METHODOLOGY AND GIVE YOU ASSISTANCE FROM ZERO TO PUBLISHING ON STORES. I eagerly await your positive response. Thanks

@diektech

Hi — Elias here from Miami. I understand you're looking to migrate an existing Flutter codebase and establish new architecture ownership. This is crucial for ensuring your app's long-term performance and maintainability. The real technical challenge typically revolves around scalability and managing dependencies. Migrating codebases can reveal hidden issues, such as workflow complexity and integration challenges with existing APIs. It looks straightforward initially, but ensuring the new architecture supports future expansion while maintaining stability requires careful planning. My approach would involve assessing the current codebase to identify potential bottlenecks. I would structure the migration to prioritize modular design, simplifying future updates and feature additions. This enhances maintainability and prepares your app for increased user load. I have worked on similar migration projects where I restructured apps for better performance and scalability, ensuring a smooth transition without disrupting user experience. A few questions to better understand the scope: Q1 – What specific features are you looking to enhance or add during this migration? Q2 – Are there any third-party services or APIs that are critical for your app's functionality? Q3 – What are your scaling expectations for the app in the next year? Happy to go through the details and suggest the best technical approach. Looking forward to hearing from you.

@asifalimzd

Hi there, FLUTTER — We can take ownership of your Flutter migration by analyzing the existing codebase, identifying the required business logic and integrations, and transferring or rebuilding functionality into the new architecture without carrying unnecessary technical debt. We have experience with Dart, Flutter, APIs, Firebase, state management, Android/iOS deployment, debugging, and production applications, with a strong focus on testing and preventing regressions. Could you share the current and new Flutter codebases so we can review the architecture and migration requirements? Kindly send me message to discuss more or directly award me. Thank you!

@starttechno

FLUTTER I bring 3 years of professional Flutter/Dart work within 10+ years of software delivery. My Freelancer portfolio can provide 3–5 Flutter apps I personally built, including responsive UI implementation, REST/Firebase integration, authentication, state handling, and Android/iOS release work. Your requirement is correctly framed: this is not a file-copy exercise. I begin with a feature/data-flow inventory of the legacy app—routes, models, API contracts, business rules, dependencies, storage, and integrations—then map each workflow to the new architecture. I transfer isolated, well-tested code only where it fits; duplicated, brittle, or obsolete logic is rebuilt or discarded with the reason documented. I protect behavior through baseline testing of critical user journeys, API/error-state checks, regression testing after each migration unit, and small reviewable Git PRs. I have worked inside unfamiliar codebases and new architectures using Bloc/Cubit, Riverpod, Provider, and GetX. A difficult issue I resolved involved Android/iOS build failures caused by incompatible Flutter, Gradle, CocoaPods, and plugin versions; I traced the dependency chain, aligned native settings, and restored reproducible builds. I work with REST APIs, Firebase Auth/FCM/Analytics, secure storage, notifications, payments, third-party SDKs, Play Console, Xcode, and App Store submissions. Muhammad Saad

@ahmadayaz

With 5+ years of experience, our team specializes in understanding and enhancing codebases, facilitating seamless transitions, and taking ownership of new architectures. We excel in successful migrations, delicate functionality transfers, and building robust architectures. Our focus is on stability, security, and scalability, aiming to propel your Flutter application forward. Let us partner with you to ensure your app not only survives but thrives in today's competitive landscape.

@efanntyo

Hi there, FLUTTER I understand the complexity and importance of migrating your existing Flutter application to a new architecture while enhancing its functionality. With over 3 years of professional experience in Flutter and Dart, I have successfully developed and migrated several applications, ensuring robust and scalable solutions. My approach starts with a thorough analysis of your current codebase to identify essential features and potential technical debt. I prioritize understanding the core business logic to ensure a seamless transition. Using my experience with state management systems like Bloc and Riverpod, I ensure that the new architecture is efficient and maintainable. I have hands-on experience with API integration, Firebase, and third-party services, which will be crucial for preserving and enhancing your application's functionality. My expertise in both Android and iOS deployment ensures reliable performance across platforms. For instance, in a previous project, I managed a complete functionality migration, maintaining existing features while refactoring outdated components to fit a modern architecture. This involved extensive testing and documentation to safeguard against regressions. I am committed to working full-time during U.S. Eastern Time hours, and I am eager to bring my skills to Production Connections, ensuring a successful migration and a strong foundation for future development. Best Regards,

@gotucat

Hi, FLUTTER Migration is not about copying screens, I reviewed the requirement to transition an existing Flutter app into a new codebase architecture while preserving business logic and behavior. I’ll analyze the legacy Flutter codebase, map data flows and integrations, then extract required functionality into the new architecture. Using Flutter, Mobile App Development patterns, and clean API integration practices, I’ll rebuild where direct migration would add technical debt, and refactor what should evolve. I focus on stability, readable scalable Dart, responsive UIs from Figma, and thorough testing to prevent regressions. Let’s discuss here now.

@Microlent

Hello, I am Dr. Rajesh Rolen, PhD in Computer Science & Engineering, with experience of over 20+ years in API Integration, Flutter, iOS Development, Mobile App Development, Mobile Development, Dart As a preferred freelancer in the top 1%, I have done 400+ projects here on freelancer.com, I have 4.9 ratings out of 5 on average, which showcases my quality of work and timely delivery. Key Highlights: - Free Hosting Support on the Cloud or any desired platform. - Free 3 months of post-delivery support to ensure that our client doesn’t face any challenges after the launch of the project. - Free Dedicated tester on projects to ensure quality delivery, so clients don’t need to act as a tester. - 10+ Years experience UI/UX team to ensure intuitive UI. Portfolio: https://www.freelancer.com/u/Microlent Please open the chat and send me a message, so we can have a more detailed discussion about the project to give you the project timeline and cost. Thank you for considering my services. I look forward to engaging in a productive conversation and understanding how I can be of assistance in bringing your project to life. Regards Rajesh Rolen

@rbtech1984

FLUTTER Hello!! The existing Flutter application will be carefully analyzed, required functionality transferred into the new architecture, unnecessary technical debt removed, and the new codebase maintained as a stable foundation for future development. * How large is the existing application and codebase? * Which state management approach does the new architecture use? * Are the three to five application links available for review? Relevant Flutter migration, refactoring, Android and iOS development projects have been completed with REST APIs, Firebase, authentication, notifications, and third-party integrations. Strong attention will be given to preserving business behavior while rebuilding weak areas properly rather than blindly copying legacy code. Full-time United States Eastern Time availability can be discussed in chat along with compensation and portfolio examples. Best regards Farhin B

@Hubready

Hello!, I am a Florida-based senior software engineer(frontend, backend, ecommerce, etc) with 15+ years of experience, and I read your Flutter codebase migration post carefully. I understand this is not just about moving code, but about taking ownership of an existing Flutter app, migrating it into a stronger architecture, and leaving you with a cleaner, more maintainable codebase that can scale properly. My approach would be: 1) review the current structure, dependencies, and API flow 2) map the migration plan before changing core logic 3) refactor in safe phases so existing features keep working 4) verify iOS behavior, API integration, state handling, and edge cases 5) leave clear notes so the next developer is not guessing I’ve spent years working with Flutter, Dart, mobile development, API integration, and backend systems, so I’m comfortable jumping into existing code, finding what’s brittle, and making it solid without unnecessary churn. Relevant work I’ve handled: - Flutter booking app with API sync and offline handling - cross-platform delivery app with role-based flows - SaaS mobile companion app connected to a Node/Python backend - data-driven dashboard app with performance-focused UI Could you please clarify the following questions to help me better understand the project? 1) What is the current state of the codebase, and what specifically is driving the migration? 2) Do you already have a target architecture in mind, or would you like me to propose one? 3)

@kabirchy

Hi there, I understand you need a Flutter developer to handle codebase migration and establish new architecture for your existing project. Many developers can build basic apps, but migrating complex codebases while maintaining functionality requires deep expertise in both legacy code analysis and modern Flutter best practices. I specialize in Flutter codebase migrations and have extensive experience refactoring existing applications while preserving core functionality. My approach includes thorough code audit, identifying technical debt, implementing clean architecture patterns, and ensuring smooth transitions without disrupting user experience. I work primarily with Dart and Flutter, with strong knowledge of native iOS development for cross-platform optimization. Your project needs someone who can dive deep into existing code, identify migration challenges early, and implement robust solutions that scale. I focus on writing maintainable, efficient code that follows Flutter's evolving standards and best practices. API integration and mobile development are core strengths, and I ensure all migrated components maintain seamless performance across devices. Best Regards, Khorshed Alam, RS Software

@bcosley

Hi, You're asking for a controlled migration: understand the old Flutter app, extract essential behavior, and land it in a new architecture without accruing debt. That matches work where teams replace legacy patterns with a solid foundation while preserving user-visible behavior. I'd begin by tracing critical flows, isolating unstable parts, and building small adapters in the new codebase to validate behavior against real usage. Then we'd incrementally migrate, add targeted tests, and align with backend contracts before releasing to QA. One realistic risk is data drift between old and new models during migration; we would guard this with strict contract checks and feature flags. What should happen if records disappear and reappear later? Who owns the data migrations and how do we coordinate releases with backend changes? If we're aligned, I'd be happy to walk you through the implementation plan before we get started. Best regards, Brandon

@a4logic

Hello, With my extensive experience in mobile app development, specifically with Flutter, I believe that I am uniquely suited for this project. Throughout my 15+ years in the field, I have honed my ability to not only build functional applications but also understand and migrate existing codebases. This assignment aligns perfectly with my core skills and gives me an opportunity to showcase the expertise I have developed over time. Migrating an existing codebase requires a deep understanding of the original developers' intentions, as well as the ability to identify what is essential and what can be improved upon. Having worked on numerous projects similar to yours, I possess an uncanny knack for quickly familiarising myself with unfamiliar codebases and identifying necessary components for a successful migration. My aim is not simply to copy-paste components but to ensure an efficient transition while preserving functionality and eliminating technical debt. Lastly, you can rely on me to take ownership of the new codebase beyond the migration phase. Not only will I maintain the existing business rules and expected behavior but also work diligently towards improving your application's underlying foundation for future enhancements. To disentangle between this long term opportunity and its alternatives; let's combine your existing business logic with my migration expertise to create a new era of solid and sustainable growth for Production Connection. Thanks!

@HamparProd

FLUTTER I have 4+ years of mobile/full-stack development experience, including production Flutter/Dart apps for Android and iOS, REST APIs, Firebase, authentication, notifications, payments and complex workflows. I’m comfortable taking ownership of unfamiliar legacy code. Before migration, I map the architecture, dependencies, models, API/services, state management, navigation and critical user flows. I separate required business logic from technical debt rather than simply copying old code into the new project. For each feature, I decide whether to transfer, refactor or rebuild based on coupling, maintainability, testability and compatibility with the new architecture. I protect existing behavior through workflow mapping, regression testing and incremental migration. I have experience with Bloc/Cubit, Provider and Riverpod, plus Gradle, CocoaPods, Xcode, Android Studio, Git and release workflows for Google Play/TestFlight. I can work independently on debugging, API integration, build failures, dependency conflicts and production issues while documenting migration decisions clearly. Expected compensation: $1,400/month. I can commit full-time to 8 AM–5 PM U.S. Eastern and am interested in long-term ownership of the new codebase.

@ciss26

Hi, I’m interested in joining Production Connections as a full-time Flutter Developer and taking ownership of the migration from the existing application to the new architecture. I understand that this role is not simply about copying screens or files. The priority is to understand the legacy codebase, identify the required business logic, preserve working functionality, remove unnecessary technical debt, and implement the right functionality cleanly within the new architecture. Why I’m a Good Fit Strong professional experience with Flutter & Dart Experience developing Android and iOS production applications Comfortable working with existing/legacy codebases Strong REST API, Firebase and third-party integration experience Experience with authentication, notifications, analytics and payments Good understanding of scalable architecture and state management Strong debugging, performance optimization and root-cause analysis skills Git/GitHub, Android Studio, Xcode, Gradle and CocoaPods experience Experience preparing and deploying applications to Google Play and App Store My Migration Approach Before making changes, I would first audit the existing application to understand: Architecture → Dependencies → Business Logic → API/Data Flow → State Management → Integrations → User Workflows Then I would classify existing functionality into: Thanks & Regards Dheeraj K.

@Eliteinno

FLUTTER Hello, Is the current codebase using any specific state management system? Are there any major APIs that need to be integrated during the migration? Excited to work on this migration! I'll ensure a smooth transition by deeply understanding and analyzing the existing application to maintain the integrity of essential functionalities. One challenge could be avoiding technical debt, which I'll tackle by carefully distinguishing obsolete code from the required functionality. I'll share examples of my work in chat. Looking forward to discussing your vision further. Let’s connect soon to explore the next steps together.

@temoberishvili

Hello! This is Temo, and I see you need a Flutter developer to handle codebase migration and new architecture ownership. It's clear you're looking for someone who can not only transition your existing code but also provide a solid structure moving forward. With around 10 years of experience in mobile app development and a solid grasp of Dart, I have worked on various projects that required API integration and architecture planning. I understand the critical goal is to migrate your codebase efficiently without compromising on performance or usability. I suggest starting with a thorough code review, followed by setting up a robust architecture that accommodates future growth. Some similar things I've built include a regional tutoring app, an internal CRM for a local agency, and a mobile marketplace platform. Let’s make sure we’re on the same page regarding your specific requirements and any potential challenges. Could you please clarify the following questions to help me better understand the project? Q1: What specific features of the existing codebase are most crucial to maintain during the migration? Q2: Are there any preferred architectural patterns you have in mind for the new setup? Q3: How do you envision the timeline for the migration and subsequent development phases?

@SBITServices

Hi, I have 5+ years of experience in Flutter. I will design and develop a fully functional Flutter mobile application for your business. The app will be cross-platform, responsive, and optimized for both Android and iOS. I will ensure smooth navigation, clean UI, and reliable performance. My Skills Include: a) Flutter Development – Expertise in building cross-platform mobile apps with responsive UI. b) State Management – Experienced in Provider, Riverpod, and Bloc for scalable apps. c) Backend Integration – Skilled in connecting apps with REST APIs, Firebase, and third-party services. d) Database Handling – Proficient in Firebase Firestore, MySQL, and SQLite. e) Deployment & Support – Experienced with publishing apps on Google Play Store and Apple App Store. Lets connect in chat so that We discuss further. With Regards, Sai

@CodeAnchors

Hello, I hope this message finds you well. I have carefully reviewed the requirements for the Flutter Developer position at Production Connections and I believe my expertise aligns well with the project objectives. With a solid background in Mobile App Development, Dart, and Flutter, I am confident in my ability to handle the codebase migration and take ownership of the new architecture effectively. My portfolio: ⭐⭐ https://www.freelancer.com/u/CodeAnchors ⭐⭐ In approaching this project, I emphasize structured requirement confirmation, controlled planning, clean implementation, thorough testing, and milestone-based transparency to ensure successful outcomes. I am committed to delivering reliable execution and long-term results that align with your business goals. One question I have for you is: What specific functionalities or features are top priorities for the codebase migration and new architecture development? I look forward to discussing the project further with you in an open chat to finalize the scope seamlessly. Best regards, Muhammad Anas Khan