Flutter–Next.js Integrated App

@om26er

Hello, i am an Expert and i can develop UPC Scanning Flutter app for you. Regarding your project, i would like to discuss the app features in detail to better understand your requirements. i am a mobile applications developer and i have more than 8 years of experience developing mobile applications with backend services. i have developed many Business Solutions from scratch to Stores ready applications. i have completed more than 550 projects. i am super confident i will provide you best quality software services on time and on budget. Let's chat to proceed.

@Hammadhassan21

Hey there! The backend is already in place, so the real focus should be making the Flutter app integrate with it cleanly without duplicating logic or creating unnecessary complexity. I’d build a modular, null safe Dart codebase with clear separation between authentication, product data, UPC scanning, PDF extraction, and the UI. The UPC flow can use the device camera to identify products and fetch their details through your existing API, while the PDF workflow handles the required fields with clear feedback when extraction fails. API errors would also be handled as proper UI states rather than leaving users guessing. I can show you similar Flutter work in chat involving API integrations, camera workflows, and document handling. I’d deliver the TestFlight and Google Play Internal Test builds along with the documented source, integration guide, tests, and two weeks of bug fix support. Portfolio: https://www.freelancer.com/u/Hammadhassan21 Best regards, Hammad Hassan

@pinkeegupta

Hello I will be able to help you. Please message me so that we will have detail technical discussion. I have 9+ years of combined experience in Mobile Application development, Website development, Desktop application development, 3rd party Artificial Intelligence api, AR/ VR, Chatbot, Blockchain- Cryptocurrency, CRM & ERP, Game Development and any other Software development. I am having expertise in Native on Android Java, Kotlin and IOS Swift, and For Hybrid Cross platform on Flutter Dart & React- Native and for web and backend on react js and node js, Python Django. Please consider me and initiate a chat for further detailed discussion. Regards, Anju

@zainalitariq245

Hi, Your backend is already in place, so the real challenge is making the Flutter layer consume those APIs cleanly while keeping authentication, real time products, camera scanning, and PDF extraction reliable on both platforms. I would structure the app so each feature is modular, errors are handled clearly, and future API changes do not require rewriting the UI. I have built Flutter applications with REST APIs, authentication, Firebase, camera based scanning, local storage, and document processing. I can handle the Figma to Flutter implementation, state management, API integration, testing, TestFlight, Google Play Internal Testing, and the integration guide. I would also validate the UPC and PDF flows on real devices rather than relying only on emulators. Do you already have a preferred PDF extraction library or should I recommend one based on the fields your backend needs?? PS: You’ll get competitive rates with the quality you deserve. After discussing your requirements ican suggest the best scalable approach and provide an estimated timeline and cost. NOTE: I have carefully gone through your project details and can assuredly deliver what you require. My portfolios, https://www.freelancer.pk/u/zainalitariq245 Looking forward to discussing your project further. Best Regards, Zain A.

@Eliteinno

Hello, Do you have a preference for using Firebase for social sign-in? Would you like me to suggest improvements to the UX from Figma? Excited about building your Flutter front-end! I'll ensure the app runs fluidly across devices, focusing on clean architecture and integration. Handling real-time updates from your API looks crucial. I'll ensure robust error feedback during interactions. I'll send previous examples in chat. Let's discuss the timeline and costs in chat once we dive deeper into the details. Looking forward to bringing your vision to life! Feel free to message me anytime to set up a chat.

@gtssoftindia

Let's get started right now. Do you have a quick time to discuss in more brief about your project on a call? I assure you that you will get a secure, scalable, and 100% bug-free Android/iOS app where you will get all kinds of features. I am always looking for a long-term relationship, and I could be the one-stop solution in terms of design, development & QA, so you don't have to search for a new employee for every new project. I can spend at least 40 hours/week on your project (the project will be completed on time). I have been in this sector for like 5+ years now and am pretty experienced in creating apps with using the, Swift, React Native, Laravel, PHP, and Node.js. I am equipped to develop apps using these languages in all industries. Well-versed in in-app purchases, Machine learning, AI solutions, Dark Mode, Siri, Memoji, Real-time tracking, Multilinguality, Live Streaming, Photo/Video Editing, Voice Search, Push Notifications, User Authentication, User Profile Creation, Location, Chat, Map/social media/Payment Integration. Apart from that, I possess great familiarity with UI design principles, patterns, and best practices, Android Architecture Patterns (MVP, MVVM, MVI), REST (Retrofit, OkHttp, WebSockets), and Strong knowledge of Android SDK, different versions of Android. I look forward to the great opportunity to work with you. Best Regards

@vladang

UPC scanning and PDF extraction are the two mobile flows most likely to fail across devices. I’d first map the REST/GraphQL contracts, auth tokens, and error states before wiring the Flutter screens. Camera permissions, malformed PDFs, offline requests, and token expiry will get explicit handling instead of generic failures. The code will use null-safe, modular layers with testable state management and documented endpoint models. The first milestone can be authentication plus the live product feed, delivered as working iOS and Android builds within four days. I’ll then add scanning, PDF extraction, Firebase notifications, static analysis, tests, store-ready builds, the integration guide, and demo video. Two weeks of handover bug fixes are included. Do your endpoints already return normalized UPC and PDF field data, or must extraction happen on-device?

@invoketech

Hello, we have experience with TIMESLIPS BILLING & TIME/EXPENSE MANAGEMENT and can provide reliable ongoing support. I have 10+ years of experience and have carefully reviewed your requirements. We can accurately manage weekly time and expense entries, monthly billing, and additional document preparation as required. WORKING FLOW: Time Entry → Accurately enter and organize weekly time records and expenses. Billing → Prepare and generate monthly bills through Timeslips. Review → Verify time entries, expenses, billing details, and supporting information. Documents → Assist with fee agreements and other billing-related documentation when required. Ongoing Support → Provide consistent, accurate support according to your workflow and schedule. I understand the importance of Timeslips experience, accuracy, and consistency and am available for reliable long-term collaboration. I will put forth my best effort in your project and ensure accurate, timely, and professional support. I eagerly await your positive response. Thanks Invoke Tech

@mughiraaa

hi, i have reviewed the details of your project. i can build the flutter front end and connect it cleanly with your existing next js rest and graphql apis for both ios and android. i have solid experience with flutter, dart, api integration, firebase, state management, and responsive mobile apps. i will implement secure authentication, product feeds, upc scanning, and pdf data extraction with proper error handling. i will keep the code modular and null safe, test both platforms, prepare the required builds, and provide clear integration notes. can we schedule a quick meeting to discuss the project in detail. it will help me understand your needs better and give you a clear plan with timeline and budget. i will also share my portfolio during the chat. mughiraa

@abhishek060

Hi, I went through the requirements. Since the backend and APIs are already in place, the main work here is connecting everything properly in Flutter and making sure the app behaves well on both iOS and Android. I’d keep the API calls, app state and UI separate so adding new features later doesn’t become difficult. For the UPC scanner, I’d handle the camera permissions and scanning failures properly. For the PDF part, I’d also keep the parsing logic separate so changes to the extracted fields don’t affect the rest of the app. I’ll also make sure API errors, loading states and invalid responses are handled properly instead of leaving users stuck on a screen. One thing I’d like to confirm: what fields do you need to extract from the PDFs? Also, is the current authentication API already ready to be used by a mobile app? If you share the repo and API docs, I can review them and give you a realistic timeline. Thanks

@ManojChauhan111

Dear Sir, I hope this message finds you well. I am a Flutter Developer with 8+ years of experience building high-performance mobile apps, specializing in clean architecture, state management, and scalable UI/UX. I specialize in developing Flutter applications and have strong domain knowledge. I can complete your project within the agreed timeframe and budget. Having worked on similar projects, I am confident I can exceed your expectations. Please let me know if you would like to discuss this further in chat. Best regards.

@arturg6

Hello, "API-First Flutter Integration" - the main risk is keeping authentication, live product data, scanning, and PDF extraction reliable across both platforms. I would structure the app with clean state management, null-safe Dart, modular API services, graceful errors, and testable scan/PDF flows. Can you share the endpoint documentation and Figma files so I can confirm the integration scope before starting? Looking forward to working with you. Artur Gizycki

@ranjika08

Since your backend and endpoints are already in place, this project really comes down to building a Flutter front end that is dependable in production, not just functional in demo mode. The tricky parts are the cross-platform behavior of camera scanning, document parsing flow, and making every API state feel clean when something fails or loads slowly. I’d approach it by building the app in modular layers so auth, feed, scan, and PDF features stay isolated and easy to extend. I’ve handled Flutter-to-API integrations where the backend was already established and the mobile side needed to be clean, documented, and release-ready. That includes state management, null safety, repo-structured code, and preparing Android/iOS test builds that pass the usual technical checks before wider rollout. With a scope like this, that discipline saves a lot of rework later. I can include a short walkthrough set of screenshots for the key flows as part of handover. - Are the push notification events already defined in Firebase, or should that part be wired from scratch? - Do you already have unit tests prepared that the app must satisfy, or should I add baseline coverage for the main flows? - Will the product listing need pagination/filtering from day one, or just real-time fetch and display initially?

@vpaul9678

With 8+ years of Flutter experience, I can build your production-ready cross-platform app and integrate all REST/GraphQL APIs with clean, scalable architecture. I have hands-on experience with authentication, real-time product APIs, UPC/barcode scanning, PDF parsing, Firebase push notifications, and SQLite. I’ll deliver TestFlight and Google Play Internal Test builds, proper documentation, static analysis/unit tests, and two weeks of post-handover bug support. I’m ready to start immediately; once I review the Figma and API documentation, I can confirm the timeline and begin the integration.

@shayankhan333

UPC scanning and PDF parsing are where these builds usually go sideways, so I'd lock those two down first against your live endpoints before polishing the Figma screens. I'll wire the Flutter app with Riverpod for state, mobile_scanner for UPC, and Syncfusion or pdfx for field extraction, then ship signed TestFlight and Play Internal builds. I can jump on this right away. 1. Are the PDFs a fixed template, or varied layouts needing rule-based parsing? 2. REST or GraphQL for the product feed? Happy to talk details in chat. Shayan

@carlosv116

Hi, I have successfully led similar projects and can execute this one just as effectively. Your requirements are well-defined, yet I see potential complexities with real-time data handling and ensuring smooth user experiences, particularly with authentication and UPC scanning features. To address this, I'll implement a clean architecture in Flutter, ensuring modularity and leveraging state management effectively. My approach will include thorough documentation and unit testing to guarantee the quality of each component. I'm curious about your preferred timeline for the initial phase and how you envision the user experience regarding the PDF parsing feature. Carlos

@abela399

Hi, I’ve worked on Flutter apps that depend heavily on backend APIs, and this is the kind of setup where keeping the mobile layer clean and predictable really matters. The UPC scanner and PDF extraction are also straightforward to isolate as reusable modules rather than letting them complicate the rest of the app. One thing I’d like to confirm first: are the PDF fields already defined by a consistent document format, or do they need to be detected dynamically across different PDFs? I’d structure the Flutter app with clear separation between API, state, models, and UI, with secure authentication and proper error handling around every endpoint. I’d also make the scanning and PDF flows asynchronous so the UI stays responsive, then test the main flows on both platforms before preparing the TestFlight and Play builds. Happy to review the endpoint documentation and Figma once available. Abel

@Sv3nie

Hi, The tricky parts here are the UPC scanner and PDF parsing, both doable with solid Flutter packages. I have built Flutter apps next to my main full-stack work. Lets get in contact first.

@engruhulajom

Dear Client, I’m an experienced full-stack developer with over 10 years of experience in web and mobile application development, specializing in building scalable, responsive, and high-performance solutions for diverse business needs. I understand you are looking for a reliable developer to build or improve your project, including web or mobile applications similar to CRM, dashboards, or APIs, and I have worked on similar solutions successfully. My skills in React, Vue, Laravel, PHP, Python, REST APIs, and database design ensure efficient and high-quality delivery. Feel free to share more details or ask questions. I’m ready to refine my approach to match your exact requirements. Looking forward to working with you. Best regards, Md Ruhul Ajom