Fullstack Developer (Flutter + Node.js) – Debug App (AI-Assisted, Max 62h)

@AwaisChaudhry

Hello, I understand you need a solo fullstack developer to debug and stabilize a Flutter frontend with Node.js/PHP backend, with thorough manual verification and auditable results within 62 hours. I will audit and fix WebSocket reconnection and sync issues, ensure wallet persistence across restarts, address balance update latency, correct transaction history endpoints and logs, enable QR scanner for sending funds, and bring crypto backend APIs (register, create, restore, tokens, notifications) back to full function. I will reproduce issues in a controlled test setup, implement robust, traceable fixes, and provide clear tests and documentation. What are your current acceptance criteria and failure modes for WebSocket reconnection, and is there an expected reconnect interval? Could you share how wallet persistence is currently implemented and what storage/encryption you require for a restart? What is the expected behavior for balance updates and how is the delay manifested (time thresholds, devices, networks)? Which API endpoints should be used for transaction history, what logs should be captured, and what logging format is preferred? What is the status of the crypto backend APIs (register, create, restore, tokens, notifications) and what dependencies or service accounts are needed to reactivate them? Best regards,

@OutsourceMan

As a seasoned fullstack developer with over 18 years of intermediation involvement under my belt, I can assure you of an exquisite debugging and stabilizing job on your app. Precise attention to detail being essential in your project, my track record showcases an unwavering commitment to thorough testing and the highest levels of quality assurance. In addition, I'm experienced with AI-assisted repair work, but reassure you that all changes will be manually verified to ensure accuracy as per your requirement. Having worked extensively with Node.js and PHP along with Flutter, not only will I streamline your frontend and backend issues but also proactively address lingering concerns. My strengths in WebSocket, chat, balance update delay, transaction history errors & API inactiveness will help me address your core challenges promptly. Extra features such as a QR scanner for sending funds which may not have been in the original scope can also be executed with ease for you as I genuinely want to deliver an app that exceeds your expectations. Lastly, my pricing structure is competitive without sacrificing quality and final payments are made only after all fixes are audited and verified by you. Based on my profile and skills set I truly believe my proficiency lies in taking this project-over. The depth of my experience combined with my innate ability to problem solve effectively makes me the ideal pick for this endeavour. Let's make your app better together!

@rahuliitm69

Hi there, I can debug and stabilize your app by fixing the WebSocket/chat issues, wallet persistence, balance sync delays, transaction history problems, QR scanner flow, and the inactive crypto backend APIs. I have over a decade of hands-on experience working as an individual full-stack developer with Flutter on the frontend and Node.js/PHP on the backend, including real-time systems, wallets, and crypto-related APIs. I will work within your hour limit, manually verify every fix, fully test each flow, document changes clearly, and make sure everything is auditable before milestone delivery. If this fits what you’re looking for, I’d be happy to connect and review the codebase so we can lock scope and start right away. Thanks, Rahul A.

@nikhilgarg96

As a seasoned fullstack developer with adept proficiency in Flutter, Node.js, and PHP, I've successfully tackled various complex app development projects, honing my skills in problem-solving, testing, and debugging along the way. Your project's core scope from WebSocket to QR scanner bugs is within my grasp and I'm confident that my meticulous approach combined with my profound understanding of AI-assisted tech will ensure comprehensive resolutions under the allocated 62 hours. Moreover, trust and transparency are paramount for impactful delivery when it comes to debugging. I've previously audited different project tasks ensuring both strict adherence to requirement and code quality. Additionally, I maintain clear documentation throughout projects as a fallback mechanism that often expedites future debugging. Lastly, I assure you not just results but a reliable partnership. My strong testament of versatility through successful projects in distinct domains including CRM systems, web-based POS, mobile apps et al adds an invaluable layer of perspective to better debug app issues. Thanks....

@corpmember29

Yes, I can do this. I am an individual fullstack developer with 10+ years of experience working across Flutter frontends and Node.js / PHP backends, including real-time apps, wallets, WebSockets, and API-heavy systems. I understand the need for manual verification, auditable fixes, and proper testing, even when AI assistance is used during debugging. I can systematically address the listed issues: WebSocket reconnection and sync, wallet persistence on restart, balance refresh logic, transaction history endpoint fixes, QR scanner integration, and reactivating crypto backend APIs (register, create, restore, tokens, notifications). I work within strict hour limits, document every fix clearly, and test each change before handoff. I’m comfortable working within the 62-hour maximum, prefer efficient resolution, and accept fixed-price milestones with verification-based release. No team involvement—direct communication and accountability throughout.

@Julian29

Yes—I can do this, and it’s a good fit for how I work. I’m an individual full-stack developer with 11+ years of experience across Flutter, Node.js, and PHP, including real-time apps (WebSockets/chat), wallet-based systems, and transaction flows. I’m comfortable debugging production issues end-to-end, verifying every fix manually, and documenting changes so they’re fully auditable. I work lean, test thoroughly, and stay well within fixed-hour constraints. AI can assist my process, but validation and accountability stay 100% human. If you’d like to proceed, I have a few clarifying questions around the crypto backend APIs and current deployment setup before estimating hours precisely.

@JijoThomas2020

Hi there! I am a mobile-focused developer and have strong hands-on experience in developing mobile apps using Flutter, so I would deliver the quality work tailored to your requirements. Please let's connect so that we can discuss the details further. Looking forward to your message. Thank you, Jijo

@sagarjain4010

Hello I’m a full-stack developer with experience in Flutter frontend and Node.js/PHP backend. I can help debug and stabilize your app, ensuring every fix is fully tested, auditable, and verified manually. I can start immediately and, as an experienced developer, you can communicate with me easily without any hassle. ✔I can handle all the issues you mentioned: WebSocket/chat reconnections and sync Wallet persistence on restart Balance updates without delay Transaction history corrections and proper API usage QR scanner for sending funds Crypto backend APIs (register, create, restore, tokens, notifications) I work individually, use AI tools only to speed things up, and provide clear documentation and test results for all fixes. I estimate completing this within 62 hours as requested. I’m happy to follow your verification process before milestone payment. ✔I’d like to clarify a few things Are the backend APIs already live or should some be mocked for testing? Should I also handle notifications for pending transactions, or only successful ones? I’d be happy to discuss your project over a call or chat. I find 1:1 conversations work best. Thanks Sagar

@usamae

I am an experienced fullstack developer proficient in Flutter and Node.js. I have a strong background in debugging and stabilizing applications, ensuring all fixes are thoroughly tested and audited. My expertise includes resolving WebSocket/chat issues, wallet persistence problems, balance update delays, transaction history discrepancies, QR scanner integration, and crypto backend API activation. I guarantee clear documentation, efficient testing, and adherence to project requirements.

@khurshid040462

Hi there, I'm excited about the opportunity to debug and stabilize your app built on Flutter and Node.js. With extensive experience in full-stack development and a strong focus on debugging, I can address the core issues you've outlined, such as enhancing WebSocket reconnection logic and fixing wallet persistence problems. My approach includes rigorous manual testing and clear documentation to ensure every fix is verifiable and auditable, aligning with your project requirements. I anticipate completing the necessary tasks within your 62-hour limit, ensuring that all fixes are thoroughly tested and documented. I am committed to providing a competitive bid while meeting the highest standards of quality.

@mrresearcher99

Hi, Yes, I can take this on. I’m an individual full-stack developer with 5+ years of experience in Flutter frontend, Node.js & PHP backends, and real-time systems (WebSockets, wallets, transactions). I’m comfortable working in an audited environment where every fix must be manually verified, tested, and clearly documented. I’ve handled similar stabilization work before, including: WebSocket/chat issues: reconnection strategies, message sync, edge-case error handling Wallet persistence bugs: secure local storage, state rehydration on app restart Balance sync delays: event-based updates instead of manual refresh Transaction history issues: correcting API endpoints, adding missing logs & validations QR scan flows: integrating scanner for send-funds use cases Inactive crypto APIs: debugging and restoring register/create/restore/token/notification flows I’m fine with AI-assisted development as a productivity tool, but all changes will be reviewed, tested, and validated manually. I’ll provide: Clear breakdown of fixes Test cases and verification steps Clean commits with auditable changes Short technical documentation per module I can work within the 62-hour cap (often less with focused debugging) and am comfortable with fixed-price, milestone-based payment released after verification. If you share access to the codebase and current issue list, I can review quickly and confirm a realistic timeline and cost. Best, Bhargav

@durgesh8527

As a prolific and solution-driven FULL STACK SOFTWARE ENGINEER, I've honed my skills drastically over my 12+ years in the industry. And yes! I'm enthusiastic about every challenge your project presents. My AngularJS expertise would be instrumental in addressing many of your app's core issues directly linked to PHP Node.js frontend to backend integration, such as WebSocket reconnection logic, wallet persistence and balance update delays. Additionally, I understand the pain-points that come with unforeseen bugs, which is why my stack also includes nextJs and Laravel; known for their cognitive abilities in debugging and stabilizing codebases. They'll come in handy when troubleshooting issues with your transaction history API connection, missing QR scanner for fund transfers, and subsequent issues with crypto backend connections. My deep knowledge of handling various technicalities on backend servers (like DB - SQL, MySQL, JSON, Mongo), third-party APIs (like AWS), and frontend UX/UI Design tools ( like Figma ) can guarantee strong documentation as well as thorough testing which you've explicitly mentioned as requirements. Just one more thing; offering flexible timings up to USA time zones will help streamline communication in real-time. Now that sounds like a flawless skillset match for your project!

@abhisaini0188

Hello, As a seasoned fullstack developer with over a decade in the industry, my expertise aligns perfectly with your project requirements. Not only do I possess hands-on experience in Flutter and Node.js/PHP, but I've also developed and maintained AI-powered applications that require meticulous debugging – matching your need for AI assistance along with manual verification. I've encountered and resolved issues similar to yours in the past, such as WebSocket logic, data persistence, and missing API endpoints. My proficiency in backend operations will increase the app's stability, ensuring transactions are logged accurately and wallets remain intact on restarts. Furthermore, I'll address any delays in balance updates by employing robust approaches such as efficient refreshing systems. Being comfortable with tight timeframes, I guarantee to complete the debugging within a maximum of 62 hours while upholding meticulous auditing, comprehensive testing, and clear documentation standards. My clean code practices and attention to detail ensure there will be no ambiguity during this process. Upon task completion and your verification of fixes, I assure you of the prompt release of payment. With Regards! Abhi

@ayesha0124

Hi there, I've carefully reviewed your project requirements for debugging and stabilizing your Flutter and Node.js app. I am confident in my ability to deliver effective solutions for the outlined issues, including WebSocket reconnection logic, wallet persistence, balance updates, transaction history accuracy, QR code functionality, and the revival of inactive crypto backend APIs. With extensive experience in full stack development, especially in Flutter and Node.js, I've successfully tackled similar projects that required meticulous debugging and testing. I understand the importance of clear documentation and rigorous testing, ensuring that all fixes are not only effective but also audit-ready. I propose to work within the maximum 62 hours, focusing on delivering solutions efficiently and to your satisfaction. I would appreciate the opportunity to discuss any specific needs or preferences you might have about the project details. Thanks,

@izhanali77

Hello, I have carefully reviewed the requirements for the Fullstack Developer project involving Flutter frontend and Node.js/PHP backend debugging. I will address the core issues by implementing reconnection logic for WebSocket/chat, ensuring wallet persistence on app restart, reducing balance update delays, fixing transaction history endpoints, adding QR scanner functionality, and activating crypto backend APIs. I will thoroughly verify all fixes, provide clear documentation, and conduct rigorous testing to meet your expectations. As an individual developer, I assure you of my dedication to this project. Let's discuss further details and begin working on this project together. I'm confident in delivering a high-quality solution that aligns with your needs. Let's proceed with this exciting project. Thank you.

@denisSolution

Hello, client I'm Denis Redzepovic, an experienced developer skilled in AngularJS, Flutter, Full Stack Development, Socket IO, Debugging, Node.js, API Development and PHP. I specialize in building high-performance, scalable, and visually appealing applications that deliver smooth functionality and a seamless user experience. Whether you need full app development, UI/UX improvements, API integrations, or performance optimizations, I can provide a tailored solution that fits your needs. I focus on clean, maintainable code with responsive UI, smooth animations, robust state management, and seamless API integration. My approach ensures scalable architecture and pixel-perfect design, delivering consistent performance across Android and iOS platforms. With cross-platform efficiency and attention to detail, I’m confident I can add strong value to your project. I’d love to discuss your requirements and find the best approach to bring your vision to life. Thanks, Denis

@rbtech1984

Hi There! ⚜⭐⭐⭐⭐⚜(( stabilize a Flutter app with Node.js or PHP backend )) (( fix websocket chat, wallet persistence, balance and transaction issues )) (( ensure all fixes are audited, tested, and documented ))⚜⭐⭐⭐⭐⚜ Your priority is clear: a reliable app where chat, wallet, and crypto APIs work without hiccups. I have handled similar fullstack debugging tasks where reconnection logic, persistent storage, API endpoints, and audit-ready testing were the main focus. I can verify every fix manually, provide clear documentation, and keep the codebase clean for future updates. I HAVE FIXED CRYPTO WALLET APPS WITH SOCKET RECONNECT LOGIC BALANCE SYNC ISSUES AND AUDITABLE TESTING AND I AM READY TO SHARE SIMILAR WORK IN THE CHAT If you want the app stable and fully auditable with clean documentation, let us discuss the current setup and the first priority issues to tackle. Warm Regards, Farhin B.

@intelliresponse

With over a decade of experience and proficiency in the exact technologies you're seeking -- Flutter, Node.js plus my bonus skill of PHP -- I'm confident in not only debugging but also stabilizing and enhancing your app. You need to remember however that AI assistance while allowed, verification will require a pair of human eyes, all fixes must be tested thoroughly - areas where I excel. Your project entails numerous, intricate issues such as WebSocket/chats sync and error-handling, wallet persistence on restart, balance update delays and other complex tasks. My extensive coding background has given me the knack to drill down to identify root causes swiftly and develop comprehensive resolutions that stand the test of time. Do note that not only am I an expert at what I do – Full-Stack development, Flutter, AngularJS, Node.js, PHP – but my work is auditable and documentation is guaranteed. Transparency is key and since it's just me – no teams involved – making this project even more efficient and highly coherent. So let’s take maximum advantage of my deep proficiency in system debugging & stabilization—extending your app's error handling capacity and enhancing productivity far beyond.

@hireageek

Hi there, I understand that you're seeking a capable fullstack developer to debug and stabilize your app, and I'm excited about the opportunity to assist you. As a top freelancer in California with numerous 5-star reviews on this platform, I have extensive experience working with Flutter, Node.js, and debugging complex applications. I specialize in addressing issues like WebSocket reconnection logic, wallet persistence, and API integration, ensuring all fixes are manually verified and thoroughly tested. Given your project's requirements and the core issues identified, I will meticulously work within the maximum of 62 hours to resolve each aspect, including enhancing error handling for the chat functionality and ensuring your crypto backend APIs are functional. My approach includes comprehensive documentation and testing, guaranteeing the stability and reliability of your app before we wrap up. Please feel free to message me right away to discuss further details and any specific requirements you may have. What specific functionalities are you hoping to prioritize in the debugging process?