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Existing Flutter Application — Production Build & Deployment We have an existing Flutter mobile application with a Python/FastAPI backend. The application is already substantially developed. We are looking for an experienced Flutter developer or small team to complete production engineering, live integrations, device testing and Android/iOS deployment. Important This is not a new app development project. The selected developer must work from the supplied source code and continue from the existing architecture. We do not want the application rebuilt from scratch unless a specific technical issue is identified and approved. Technology Stack - Flutter - Android / iOS - Python / FastAPI - PostgreSQL - Redis - Firebase - FCM / APNs - REST / OpenAPI APIs - OCR / ML Kit - Offline synchronization - Secure local storage - Background services / notifications Scope of Work - Set up and review the supplied Flutter and backend source - Resolve dependencies and generate genuine lockfiles - Run Flutter analyze/tests and fix build issues - Build Android APK/AAB - Build iOS/TestFlight-ready archive - Configure Android and iOS signing - Configure Firebase production environment - Configure FCM and APNs - Configure OTP/SMS provider - Configure backend API integrations - Configure OCR and file-storage services - Configure PostgreSQL and Redis production environment - Configure production secrets securely - Configure mobile app integrity/security controls - Test notifications and background execution - Test offline/reconnect behavior - Test on physical Android and iPhone devices - Fix runtime/device-specific issues - Deploy backend to production - Support Google Play Store submission - Support Apple App Store/TestFlight submission - Provide final clean source and deployment documentation Developer Requirements Strong practical experience required in: - Flutter production applications - Android release engineering - iOS/Xcode release engineering - Python/FastAPI - PostgreSQL - Firebase - FCM/APNs - Mobile background processing - Offline synchronization - REST APIs - Google Play deployment - Apple App Store/TestFlight deployment Experience with mobile security, Firebase App Check, Play Integrity, Apple App Attest, OCR and external API integrations is preferred. When Submitting Your Bid Please provide: 1. Fixed-price or milestone-wise quotation 2. Exact scope included in your quotation 3. Flutter experience 4. Android/iOS release experience 5. Backend/FastAPI experience 6. Links to production apps you have personally worked on 7. Whether Play Store deployment is included 8. Whether App Store/TestFlight deployment is included 9. Whether Firebase/server setup is included 10. Number of people who will work on the project 11. Any third-party service costs that are excluded Please do not submit a generic bid. Detailed functional information and complete source code will be shared only with shortlisted developers.
Project ID: 40679714
51 proposals
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Active 3 days ago
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51 freelancers are bidding on average ₹7,958 INR for this job

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
₹4,600 INR in 2 days
6.0
6.0

Since the app is already substantially built, I’d focus first on production-readiness rather than touching the existing architecture unnecessarily. My approach would be: review the Flutter/FastAPI codebase, resolve dependencies and release blockers, validate offline sync/background tasks, configure Firebase/FCM/APNs, signing, production secrets, PostgreSQL/Redis, OCR/storage integrations, then test on real Android/iPhone devices before store submission. I can include APK/AAB, TestFlight-ready iOS build, Play Store/App Store support, backend deployment, Firebase/server setup, and final deployment documentation in the same milestone plan. I’d suggest milestones for code audit → production integrations → device testing/fixes → backend deployment → store release. Before fixing the price, I’d like to review the repository structure and current build status. Are Android and iOS builds currently compiling successfully in development mode?
₹7,000 INR in 7 days
6.0
6.0

Hi, I would like to grab this opportunity and will work till you get 100% satisfied with my work. I just applied after read your job posting carefully and I believe that I am good fit to your project. I'm a serious bidder. I will satisfy you with my high skills! I am an expert which have 10+ years of experience on Mobile App Development, iPhone, User Interface / IA, PhoneGap, Mobile App Testing, Swift, Google Maps API, Web Development, iOS Development, Mobile Development I am looking forward to meet you to discuss the further detail about this project. Looking forward to hearing from you. Warm Regards
₹7,000 INR in 2 days
4.9
4.9

Hello, I’ve carefully reviewed your requirements and have the expertise to deliver this project with high quality, on time, and to your expectations. With 6+ years of hands-on experience in Python automation, social media growth, and AI-driven workflows, I’m confident I can deliver the results you need. I review the existing Flutter code, resolve dependency conflicts, and generate accurate lockfiles. I run flutter analyze and unit tests, fixing build issues on both Android and iOS. I configure Firebase production, FCM, APNs, OTP provider, and backend API endpoints, ensuring secure secrets and environment variables. I set up PostgreSQL, Redis, and file‑storage services in production, and enable background services and offline sync. I build signed APK/AAB and iOS TestFlight archive, then submit to Google Play and Apple App Store, handling all release notes and compliance checks. I test notifications, background execution, and offline reconnection on physical Android and iPhone devices, fixing any runtime bugs. I deliver a clean source, deployment scripts, and documentation for future maintenance. I also set up CI pipelines with GitHub Actions to automate builds and run tests on every commit, and configure crash reporting with Firebase Crashlytics to catch production issues early. Looking forward to discussing the project details further on chat. Best regards, NAVEEN THAKUR
₹1,500 INR in 20 days
5.1
5.1

As a seasoned entrepreneur with over 9+years of hands-on experience in web and mobile development. I believe my team and I have the skills and expertise that your project needs to be perfected. We are well acquainted with Flutter, Android, iOS, Python, FastAPI, and other technologies mentioned in the project description. Moreover, we understand the importance of preserving existing architecture. Our approach will always be launching from the supplied source code and continuing on the preexisting blueprint unless any technical issues warrant a specific rebuild. My extensive background developing with Flutter includes all the requirements listed for this job—from resolving dependencies to configuring backend API integrations. My proficiency with deployment processes for both Google Play Store and Apple App Store/TestFlight ensures smooth publication of your app's final build. And not to mention, backend deployment comes as part of my package. During my career, I have developed various applications for different industries. I will gladly provide you links to some of my production-worthy apps which clearly demonstrate my abilities to fulfill your expectation better. In addition, number of people will work on project only according to the requirement of project . Lastly, our pricing strategy is crystal clear and competitive without compromising on quality. We include Firebase/server setup along with three months of post-delivery support for free. Any third-party se
₹17,000 INR in 7 days
5.3
5.3

Being a seasoned Flutter developer with experience in iOS and Android release engineering, I am confident to say that I possess the skills your project demands. I have a deep understanding of Python and FastAPI, both of which solidify my ability to work on your app's backend. Not only this, but I also have a strong command over PostgreSQL, Firebase, FCM/APNs, and mobile background processing - ensuring I can successfully configure all these components within your app. I am groomed to handle complex requirements and understand the value of clean, scalable systems in an evolving digital market. My history of turning clients' abstract ideas into efficient digital products aligns perfectly with your project's descriptions. Moreover, security in a mobile app is crucial, something that I hold dear to my heart as well. My knowledge in OCR and external API integrations further assists me while working on such projects. Delivering lasting success— this is what I'm known for in the various industries that I’ve worked with. Being able to grow alongside a business is a skill not many freelancers can provide.I am confident that my team and I can deliver not only the functionalities encompassed in the project’spectrum but also tailormade solutions to any obstacles we may face; together we can bring your vision to life!
₹1,500 INR in 4 days
4.4
4.4

My name is Govind Sawarn and I am a highly experienced Flutter developer with a passion for turning raw code into dynamic, fully-functional applications. I have over 6 years of experience in mobile app development and backend management, which perfectly aligns with the requirements of your Flutter project. My expertise also covers essential components such as POSTgreSQl, API Integration, and Mobile App Development - all of which are crucial aspects for your project. The unique perspective I bring to the table is my talent in combining design aesthetics with coding functionalities. This means not only will your app be robustly engineered with sophisticated APIs and local storage solutions (which aligns with your needs for offline synchronization and secure local storage), it will also look and feel seamlessly integrated owing to my expertise across sleek .
₹1,500 INR in 2 days
3.9
3.9

As an experienced Flutter developer, I understand the importance of keeping your existing app intact while making crucial improvements where necessary. I have significant experience in Flutter production applications as well as Android and iOS release engineering. Moreover, my expertise extends to Python/FastAPI and PostgreSQL, which are key components of your technology stack. The fact that I have built platforms that handle big sums of money and involve security features makes me confident in handling tasks related to Firebase, FCM/APNs, mobile background processing, offline synchronization and OCR/ML Kit. I've built numerous automation systems and full-stack platforms that give me a deep understanding of REST APIs and secure local storage – two more vital parts of your project requirements. For Google Play deployment as well as Apple App Store/TestFlight deployment, you can rely on my proficiency. Not only will I complete the missing pieces of your application but also ensure its seamless integration into existing systems by setting up and reviewing the supplied Flutter and backend source code.
₹1,500 INR in 2 days
4.0
4.0

Hi, I’ve carefully gone through your requirements and understand this is an existing Flutter + FastAPI application that needs production completion, not a rebuild. I can review the supplied codebase, resolve dependencies/build issues, configure Firebase/FCM/APNs, APIs, backend services, offline sync, signing, device testing, and handle both Google Play and TestFlight/App Store deployment. Could you please share the current project status and source code with shortlisted developers? Also, are the production server, Firebase, SMS/OTP, and Apple/Google developer accounts already available? I’ll first audit the existing architecture and provide a clear milestone-wise plan before making changes. Let’s discuss the details in chat and proceed with the next steps. Best Regards, Arshiya
₹12,000 INR in 7 days
3.1
3.1

Hello, I’m interested in finalizing and deploying your existing Flutter application. I understand this is a production-engineering project, not a rebuild, and I will work directly from your supplied source and architecture. I have Flutter/Dart experience building cross-platform Android/iOS applications and can handle source setup, dependency resolution, build issues, API integration, device testing, debugging, and release preparation. My proposed scope: Flutter project review, dependency/lockfile cleanup, analyze/tests, Android APK/AAB, iOS build preparation, Firebase/FCM configuration, REST API integration, offline/reconnect testing, notification/background testing, physical-device testing, and deployment support. I can also work with the Python/FastAPI backend, PostgreSQL, Redis, Firebase, OCR/file services, and production configuration as required. Team: 1 developer Quotation: I can provide a fixed price after reviewing the source code and functional scope. Play Store: Included App Store/TestFlight: Included, subject to having the required Apple Developer/Xcode environment and credentials. Firebase/server setup: Included within the agreed scope. Third-party costs: Apple/Google developer accounts, SMS/OTP, hosting, Firebase quotas, and other paid services are excluded. I’m available to start immediately and can provide clear milestones for finalization, testing, and deployment. Best regards, Abdullah
₹7,000 INR in 7 days
2.8
2.8

Hi, At first glance, this looks straightforward but there’s usually one part that causes issues later. I’ve handled similar work before and can help you avoid that. Regards, Rajesh
₹1,500 INR in 7 days
2.3
2.3

Hello, I have 6+ years of experience in mobile and full-stack development, with hands-on experience in Flutter, Android/iOS release engineering, REST APIs, Firebase, PostgreSQL, and production deployments. I understand this is an existing Flutter application and will work from your supplied architecture rather than rebuilding it. I can audit the Flutter/FastAPI codebase, resolve dependencies and lockfiles, run analyze/tests, fix build and runtime issues, configure Android/iOS signing, and prepare production APK/AAB and TestFlight builds. I’ll also configure Firebase, FCM/APNs, OTP/SMS, OCR/ML Kit, file storage, PostgreSQL, Redis, and secure production secrets. Testing will cover physical Android/iPhone devices, background notifications, offline synchronization, reconnect scenarios, API integrations, and device-specific issues. I can also implement or verify Firebase App Check, Play Integrity, and appropriate iOS security controls where required. My quotation will include backend/server setup, Firebase configuration, Play Store submission support, and App Store/TestFlight deployment. I’ll provide clean source code, deployment documentation, and a final production handover. Team: 1 experienced developer Availability: Immediate Best Regards, Shailender
₹8,000 INR in 10 days
2.3
2.3

The key here is not rebuilding your Flutter app—it is taking the existing Flutter + FastAPI stack through a proper production-engineering cycle: dependency cleanup, real integrations, physical-device testing, signing, backend deployment, and Play Store/App Store readiness. I’d handle this as a structured production handover. First, I’ll audit the supplied Flutter/FastAPI architecture, resolve dependencies and lockfiles, run analyze/tests, and identify release blockers. Then we’ll configure Firebase, FCM/APNs, OTP, OCR/storage, PostgreSQL/Redis, secure secrets, offline sync and background services. Finally, I’ll test on real Android/iPhone devices, fix release-specific issues, generate the AAB and iOS/TestFlight build, and assist with both store submissions. I suggest milestones: (1) audit + build stabilization, (2) production integrations/backend, (3) device/security testing, (4) Android/iOS release + deployment documentation. Before finalizing the fixed quote, I’d like to confirm: are all third-party accounts/API credentials already available, and is the current backend intended for the same production infrastructure? Once the source is shared, we can assess the actual remaining work and provide a precise milestone-wise quotation.
₹7,000 INR in 10 days
4.5
4.5

With over 15 years of full-stack development expertise, I am thrilled to offer my skills for completing the final stage of your existing flutter app. Consistent with the project brief, my technical proficiencies and experience sharply align with your needs. I am a veteran in working on both Android and iOS release engineering, and have a strong command over Flutter and FastAPI which will facilitate smooth collaboration with your existing codebase. My deep understanding of mobile security will ensure a tight-knit integration of Firebase App Check, Play Integrity, and Apple App Attest into the final deployment. My valued experience working with OCR and external API integrations will prove highly beneficial in configuring the OCR and file-storage services. As an experienced developer, I understand that effective communication is essential for project success. I guarantee not just timely deliveries but also transparent, reliable communication to keep you updated at every stage. With dedication to superior code quality and user-focused designs, I'm ready not just to complete this project diligently but also to establish a long-term relationship bringing all my assistance whenever required. Please find my bid enclosed which encapsulates the exact scope specified in your detailed project description. I assure you no unpleasant surprises and that everything mentioned is included; from the full backend
₹7,000 INR in 5 days
1.2
1.2

Being a seasoned technology professional, I, Kratika, from Neuravolt Technology, take immense pride in delivering innovative digital solutions for diverse industries. My team and I possess robust experience in all the areas required for your project: Flutter production applications, Android and iOS release engineering, Python/FastAPI, PostgreSQL, Firebase, FCM/APNs integration, mobile background processing and many more. In particular, our extensive background with Flutter will prove invaluable in finalizing and deploying your existing Flutter mobile application. At Neuravolt, we always emphasize the importance of clear communication and transparency with our clients. We comprehend that this is not a new app development project and we are ready to work exactly from your supplied source code and follow through with your existing architecture. Our goal is to complete the production engineering while conducting meticulous testing on physical devices to ensure utmost efficiency.
₹5,000 INR in 7 days
1.2
1.2

I can take this as a bounded release-readiness milestone, not the full production deployment within the listed budget. Included: 1. Set up and inspect the supplied Flutter/FastAPI codebase. 2. Resolve only blockers required to run dependency checks and initial builds. 3. Run Flutter analyze/tests and verify Android/iOS build configuration. 4. Review Firebase, notifications, backend, PostgreSQL/Redis, signing and store-readiness gaps. 5. Deliver a prioritized issue report, deployment plan and fixed estimates for implementation milestones. Limit: up to 5 hours. Deliverables are the audit report and any small setup fixes completed within that limit. Play Store/App Store submission, production server setup, third-party configuration and broad runtime fixes are excluded from this milestone. Fixed price: approximately ₹12,000 equivalent. Work will be performed by one developer. Third-party fees and accounts remain client-provided. Can you provide the current build status and a list of known blockers? Is macOS/Xcode signing already configured under client-owned accounts?
₹12,219.72 INR in 1 day
0.0
0.0

Hello! I understand the core challenge is taking an already-developed Flutter application to a stable production release without rebuilding the existing architecture—including real-device testing, live integrations, security, backend deployment, and both Android/iOS store readiness. I’ll work directly with your supplied Flutter + FastAPI source, first auditing the existing setup, resolving dependencies/build issues, running Flutter analyze/tests, and then handling production configuration for Firebase, FCM/APNs, OTP, OCR, storage, PostgreSQL, Redis, and secure secrets. I specialize in Flutter, full-stack mobile applications, FastAPI, Firebase, PostgreSQL and production deployment, with 8+ years of experience. I’ll provide a clean final source, deployment documentation, and a clear milestone-wise scope so there are no surprises. I’m comfortable continuing an existing architecture and fixing the actual production issues rather than unnecessarily rebuilding the application. Best regards, Ritesh N
₹1,500 INR in 7 days
0.1
0.1

Hello, I’m a full-stack developer with experience in Flutter, Python/Node.js, REST APIs, PostgreSQL and Firebase. I understand this is an existing production application and will work with the supplied source code rather than rebuilding it. I can help with: • Flutter dependency/build issues and production configuration • Android APK/AAB build and release preparation • Firebase/FCM configuration and notification testing • FastAPI/PostgreSQL API integration • Production environment and secure secrets configuration • Runtime, API and device-specific troubleshooting • Offline/reconnect flow testing • Deployment documentation and clean source handover I can first review the existing source and provide a clear milestone-based plan after identifying the remaining production issues. Bid: ₹12,500 Initial timeline: 10–14 days Team: 1 developer Availability: Immediate Third-party costs such as Apple Developer, Google Play, Firebase/SMS providers and other paid services would be excluded from the development fee. I’m happy to review the source code after being shortlisted and confirm the exact scope before implementation.
₹14,000 INR in 14 days
0.0
0.0

Hi there, I’ve got deep experience fine-tuning and deploying Flutter apps, especially ones that tie into Python backends. I understand the importance of working with existing architecture, so I’ll ensure that your app is optimized and deployed without starting from scratch. I noticed you’re looking for a clean and professional production build that includes everything from device testing to backend deployment. It's all about making sure the app is user-friendly and seamlessly integrated with your backend. I specialize in Flutter and have a strong track record in Android and iOS release engineering, as well as backend integrations. I’m committed to speedy communication and a fast turnaround, so you can count on me to keep things moving smoothly. Let me know if you are available for a quick chat! Regards, Wonita
₹3,900 INR in 7 days
0.0
0.0

I'm a Flutter engineer with 6+ years shipping production apps to both Play Store and App Store. I'll take your existing codebase, resolve all dependencies, run full Flutter analysis and testing, generate production Android AAB and iOS archives with proper signing, configure Firebase, FCM, APNs, and your OTP provider, test offline sync and background notifications on real devices, fix platform-specific issues, and handle both store submissions including all documentation. My recent work includes a fintech app with 50k+ users and a healthcare app with offline-first architecture. I include Play Store, App Store, Firebase setup, and backend PostgreSQL/Redis deployment in my fixed quote. Solo delivery ensures continuity and direct accountability for every integration point.
₹1,515 INR in 7 days
0.0
0.0

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