
Open
Posted
•
Ends in 2 hours
Paid on delivery
oooooooooooooooooooooooooooooooooo Job Post: Senior Full-Stack Flutter Developer Needed for a Next-Gen Fitness & Rewards App Project Overview We are looking for a highly skilled Senior Full-Stack Flutter Developer to build a premium, high-performance fitness application for both Android and iOS. The core concept of the app revolves around tracking users' steps and converting them into a dual-token reward system, fully integrated with a digital marketplace. Technical Requirements App Development: Utilize Flutter to ensure a single, clean, documented, and highly maintainable codebase (Clean Architecture) that allows for seamless future scalability. Step Tracking: Establish accurate and secure integration with native device sensors and official health gateways: Google Fit for Android and Apple HealthKit for iOS. Zero-Tolerance Anti-Fraud System: Due to the financial nature of the reward system, building a bulletproof backend security system to prevent step spoofing, movement fakes, and account farming is mandatory. Security protocols must include: Device Fingerprinting to prevent multi-account abuse on a single device. IP Monitoring & Firewall protection to detect and block VPNs, proxies, and emulators. Strict Server-side Validation to verify the authenticity of synced step data before rewarding tokens. Dual-Token Economy Token A (Bronze): Earned directly through walking (e.g., 1,000 steps = 10 Bronze tokens). This is an in-app utility currency and cannot be withdrawn directly. Token B (Gold): Acquired by converting Bronze tokens or through specific achievements. Gold tokens are redeemable for valuable rewards. To ensure financial sustainability, a strict daily cap of 10 Gold tokens per user must be enforced. Admin Panel & Digital Marketplace A secure, comprehensive Admin Dashboard to manage users, monitor transactions, and handle redemptions. API-based Automated Fulfillment for instant delivery of digital gift cards (e.g., Amazon, etc.) upon user redemption. Seamless integration with secure payment and withdrawal gateways, specifically supporting International Credit Cards (Mastercard) and Crypto (USDT). UI/UX & Visual Identity Premium UI/UX: The interface must look modern, sleek, and high-end. Theme: A core Dark Theme contrasted with luxurious details, combining ancient Babylonian Blue and 3D Gold Accents. Terms of Delivery & Acceptance Full Source Code Transfer: Delivery of the complete, unencrypted source code along with 100% intellectual property (IP) rights upon project completion. Post-Launch Support & Warranty: A dedicated support period after successfully publishing the apps to the Google Play Store and Apple App Store to resolve any hidden bugs or security vulnerabilities. How to Apply If you have the technical expertise to deliver this project to the highest standards, please submit your proposal along with links to live Flutter applications you have previously developed and published on the App Store or Google Play.
Project ID: 40472446
196 proposals
Open for bidding
Remote project
Active 17 hours ago
Set your budget and timeframe
Get paid for your work
Outline your proposal
It's free to sign up and bid on jobs
196 freelancers are bidding on average $551 USD for this job

Hello, >>>> Multi languages (English and Arabic)Left-To-Right (LTR) and Right-To-Left (RTL) <<<< I have seen your project post as you need **** Cross-Platform Flutter Dart Fitness Rewards Mobile Applications With Backend **** .According to your needs, I can able to make your application. I have experience and expertise in Firebase and Flutter Dart Cross-Platform mobile applications (Android & iPhone) and App admin with development web services where admin can manage the app from the backend, Cross-Platform application, React Native, Flutter , Xamarin Android Java/Kotlin, iOS Objective C /Swift/Swift UI . and Laravel MVC, React JS, Node.js PHP, Angular, WordPress, MySQL, and MongoDB. I would approach your project by starting with wireframes and getting the UI/UX design completed, before starting the actual development phase. We'll provide You high Quality Design and development for you with unlimited changes in design. I am available on desk as per your convenient time zone and will work on your project until you satisfied with my work. Awaiting for your positive response. Thanks Christina
$494 USD in 9 days
8.4
8.4

Hi, I'm a senior Flutter developer with full-stack experience and I can build this fitness rewards app to the highest standard. My approach: - Flutter (Clean Architecture) for Android + iOS from a single codebase - Google Fit + Apple HealthKit integration for accurate step tracking - Anti-fraud system: device fingerprinting, IP monitoring, server-side step validation - Dual-token economy (Bronze/Gold) with daily cap enforcement - Secure admin dashboard for user management and redemptions - Gift card API fulfillment + Mastercard/USDT withdrawal support - Premium dark UI with Babylonian Blue and 3D Gold accents - Full source code + IP transfer + post-launch support I have published Flutter apps on both Play Store and App Store. Happy to share live examples. Regards, Harsh Thoriya
$750 USD in 7 days
8.3
8.3

Hi there, I understand your system's operational loop: the Flutter app syncs step data from HealthKit/Google Fit to a backend anti-fraud engine. This engine validates the data via device fingerprinting and IP analysis before issuing Bronze tokens. Users convert these to capped Gold tokens for redeeming digital gift cards, which triggers an automated fulfillment API. Admins oversee the entire process. Technical approach: - Flutter frontend using Clean Architecture. - Secure REST API (Spring Boot/Node.js) with a PostgreSQL ledger. - Server-side anti-fraud module with device fingerprinting, IP intelligence, and data heuristics. - Key integrations: HealthKit/Google Fit, a gift card fulfillment API, and payment gateways (crypto/fiat). Core modules: - Health Data Sync & Validation Engine - Dual-Token Ledger & Economy Manager - Automated Reward Fulfillment Marketplace - Admin & Security Monitoring Panel Relevant systems: HERO2 (UC Berkeley's transport tracking & rewards app) StepOut Live (Complex 4-app Flutter ecosystem with payments) Our strategy is to build the secure backend and ledger first, then the Flutter data sync. We'll rigorously test the anti-fraud layer before implementing the marketplace. This ensures the core economic and security model is solid from day one. Regards, Rohit
$250 USD in 45 days
8.1
8.1

A Warm Hello! Your app concept is ambitious and technically exciting because it combines fitness tracking, fraud-resistant reward mechanics, fintech integrations, and a premium mobile experience into a single scalable ecosystem. I have strong experience in Flutter-based cross-platform development, secure backend systems, API integrations, and admin dashboard architecture. What immediately stands out is the anti-fraud layer — this is the most critical part of the platform, and I fully agree it must be enforced server-side rather than trusting client health data alone. I can help architect: * Google Fit & Apple HealthKit integration * Device fingerprinting & emulator/VPN detection * Step-validation pipelines with anomaly detection * Daily reward caps & token economy logic * Secure redemption workflows * Crypto & card payment integrations * Marketplace & automated fulfillment APIs * Admin analytics and moderation dashboards I also understand the importance of polished UI/UX for retention. The Babylonian Blue + 3D Gold premium dark theme can be executed with smooth animations and high-end interactions while keeping performance optimized on both platforms. This definitely looks like a long-term product rather than a simple app build, and I’d be excited to contribute to it. Best Regards, Jemin Sagar
$500 USD in 7 days
7.1
7.1

--- Full-Stack Flutter Fitness & Rewards App Development --- I'd love to help build your next-generation fitness & rewards platform with a scalable Flutter architecture, enterprise-grade anti-fraud protection, and a premium user experience optimized for both Android and iOS. * Step Tracking Integration * Google Fit & Apple HealthKit Sync * Dual Token Reward System * Bronze & Gold Token Management * Daily Reward Limits * Anti-Fraud Protection System * Device Fingerprinting * VPN & Emulator Detection * Server-Side Step Validation * User Authentication & Security * Real-Time Reward Processing * Digital Marketplace * Gift Card Redemption System * Crypto & Card Payment Integration * USDT Withdrawal Support * Secure Admin Dashboard * User & Transaction Management * Reward & Redemption Management * Push Notifications * API-Based Architecture Lets connect... Thanks
$370 USD in 12 days
7.3
7.3

With over 10 years of professional experience, my team at Carol Data Technology stands as the most competent fit to take on your cutting-edge fitness app project. As a CMMI Level 3 company, we not only excel in understanding your project vision but also excelling in its execution. Our advanced knowledge in single codebase development using Flutter aligns perfectly with your technical requirements for a clean, future-proof, and scalable app structure. Moreover, security is our utmost priority! Having built numerous apps focused around financial transactions, we understand the challenges involved. My proficient understanding and utilization of device fingerprinting, IP monitoring, and server-side validation techniques will ensure that your reward system remains untarnished by fraudulent activities. Finally, aesthetic appeal amplifies user engagement and we've got that covered too! Our extensive expertise in UI/UX design will add an appealing touch to your app's interface, incorporating your desired theme with Babylonian Blue and 3D Gold accents. Not only do we design elegant applications but also work cohesively with App Store & Google Play policies to ensure successful publishing. So why not entrust us with this exciting project! We promise nothing short of excellence in every deliverable along with unwavering post-launch support!
$250 USD in 25 days
6.9
6.9

Hi, We’re a full-stack development team experienced in Flutter, backend architecture, admin systems, APIs, and secure reward-based platforms. We can build your fitness + rewards app with: Flutter iOS/Android app Google Fit + Apple Health integration Secure anti-fraud backend validation Dual-token economy logic Admin dashboard + digital marketplace Crypto/card payment integrations Premium dark UI with luxury styling We focus on scalable clean architecture, security-first development, and long-term maintainability. We’d be happy to review the scope and structure the MVP into clear development phases. Regards Interconnect Team
$500 USD in 7 days
6.8
6.8

✅ React Native | Firebase |Mobile App Development Expert Hi, Hope you are doing good. I have read your requirements carefully and can give you 100% assistance as a React Native Developer for building or enhancing your mobile application. I specialize in creating fast, stable, and scalable apps for both iOS & Android, backed by a secure and efficient Firebase architecture. I’d love the opportunity to discuss your idea further and collaborate on developing a modern, intuitive, and impactful app. (Note: Please consider the current budget as flexible — we can finalize it after discussing the complete scope.) Thanks & Regards, Kajal
$750 USD in 7 days
6.7
6.7

Hello, I hope you are doing well. I understand that you are looking to build a FITNESS MOBILE APPLICATION WITH A REWARD FEATURE, and I would be happy to help. I have extensive experience in designing and developing applications and have successfully delivered many projects. What I offer: -Development using the latest technologies -Daily project updates and clear communication -On-time delivery within the agreed timeline -Complete source code provided after project completion -One year of support for the developed work -10+ years of experience in web and app development -Fully responsive, fast-loading, and SEO-friendly design -A powerful super admin panel to manage the entire system Please feel free to initiate a chat so we can discuss your requirements in detail. Thank you and regards, Dheeraj K.
$250 USD in 7 days
7.0
7.0

Hi 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 and php CodeIgniter mvc and Laravel. Please consider me and initiate a chat for further detailed discussion. Regards, Anju
$500 USD in 14 days
6.6
6.6

Hello, Doomshell Software Pvt Ltd specializes in Flutter, full-stack development, fintech solutions, and secure scalable applications. Your fitness rewards platform aligns perfectly with our expertise in mobile apps, backend systems, payment integrations, and anti-fraud architecture. Our Approach: • Develop a scalable Flutter app for Android & iOS using Clean Architecture • Integrate Google Fit & Apple HealthKit for accurate step tracking • Build a secure backend with anti-cheat protection, device fingerprinting, VPN/emulator detection, and server-side validation • Develop dual-token wallet, reward engine, marketplace, and admin dashboard • Integrate Mastercard, crypto payments (USDT), and automated reward fulfillment APIs • Deliver premium dark-theme UI with modern animations and smooth UX Delivery: • UI/UX Design • Flutter Mobile App • Backend APIs & Admin Panel • Security & Payment Integration • App Store & Play Store Deployment • Post-launch Support & Maintenance Quick Question: Do you already have reward fulfillment/gift card API providers selected, or would you like us to recommend and integrate the best options? We would be excited to become your long-term technology partner.
$650 USD in 7 days
6.3
6.3

Hello! I am glad to say that i have already developed an Fitness and Rewards Platform with advanced step tracking, secure reward distribution, anti fraud protection, and a digital marketplace ecosystem. The goal is to create a premium and scalable mobile application that combines fitness engagement with a secure dual token reward economy while maintaining enterprise level security and performance. My focus will be on delivering a high performance Flutter application with scalable backend infrastructure, featuring: Google Fit and Apple HealthKit integration, secure step synchronization and validation, dual token reward management, anti fraud systems with device fingerprinting and server side verification, admin dashboard with transaction monitoring, digital marketplace and redemption workflows, Mastercard and USDT payment integrations. I specialize in Flutter, scalable backend systems, API integrations, and secure fintech style architectures with focus on Clean Architecture, performance optimization, and enterprise grade security. My experience includes fitness applications, reward ecosystems, payment integrations, admin panels, and real time systems designed for scalability, maintainability, and secure user engagement. Let’s connect to review the reward logic, fraud prevention workflows, marketplace integrations, and launch strategy so we can finalize the architecture, MVP scope, and development roadmap. Best regards, Nikita Gupta.
$300 USD in 28 days
5.9
5.9

⭐⭐⭐⭐⭐ Build a High-Performance Fitness & Rewards App with Flutter ❇️ Hi My Friend, I hope you are doing well. I've reviewed your project requirements and see you're looking for a Senior Full-Stack Flutter Developer. Look no further; Zohaib is here to help you! My team has successfully completed 50+ similar projects for fitness apps. I will create a premium, high-performance app that tracks steps and integrates a dual-token reward system. We will ensure clean code and strong security for user data. ➡️ Why Me? I can easily do your fitness app development as I have 5 years of experience in Flutter, step tracking, and secure app development. My expertise includes backend integration, user authentication, and UI/UX design. I also have a strong grip on technologies like Google Fit, Apple HealthKit, and database management. ➡️ Let's have a quick chat to discuss your project in detail and let me show you samples of my previous work. I look forward to discussing this with you in our chat. ➡️ Skills & Experience: ✅ Flutter Development ✅ Step Tracking Integration ✅ Secure Backend Development ✅ User Authentication ✅ API Integration ✅ UI/UX Design ✅ Database Management ✅ Clean Architecture ✅ Post-Launch Support ✅ Digital Marketplace Integration ✅ Payment Gateway Integration ✅ Anti-Fraud Security Measures Waiting for your response! Best Regards, Zohaib
$350 USD in 2 days
5.8
5.8

With over 10 years of experience as a Full-Stack Developer, I possess the comprehensive skill set and technical prowess needed to bring your Fitness & Rewards app to life. My expertise spans across web and mobile applications employing technologies like Flutter, React Native, Android, iOS, Node.js, Python, PHP, MongoDB, and AWS & Azure cloud systems - all of which are integral to realizing your vision. My team and I prioritize delivering clean, functional solutions efficiently. Your dual-token system's robustness is a core concern, and I'm confident in my ability to meet your requirements through solid backend security measures like device fingerprinting, IP monitoring & firewall protection. Alongside enforcing a daily cap on Gold tokens per user for financial sustainability. Beyond the technical proficiency, we also understand that sound design leads to an immersive user experience. Our expert UI/UX designers will ensure a sleek modern interface with luxurious detailing combing ancient Babylonian Blue and 3D Gold Accents in line with your visual identity.
$250 USD in 7 days
5.5
5.5

Hello, I’m very interested in building your next-generation fitness and rewards platform and can deliver a secure, scalable Flutter-based solution with a premium user experience for both Android and iOS. I would develop the application using Flutter with Clean Architecture, integrated with Google Fit and Apple HealthKit for accurate activity tracking, alongside a robust backend using Node.js/NestJS or Laravel with strict server-side validation, device fingerprinting, IP monitoring, anti-emulator detection, and fraud-prevention logic to secure the token economy. The platform will include the dual-token reward system, real-time admin dashboard, automated marketplace/redemption workflows, payment integrations for Mastercard and USDT, and a responsive dark-themed UI featuring Babylonian blue and luxury gold-inspired design elements. I also follow structured deployment and testing workflows, provide complete source code ownership with documentation, and offer post-launch support to ensure smooth App Store and Google Play publication, performance optimization, and security stability after release. Lets discuss.
$500 USD in 7 days
5.5
5.5

I understand you need a Senior Full-Stack Flutter Developer to build your next-gen fitness and rewards app for Android and iOS, focusing on step tracking and a dual-token reward system integrated with a digital marketplace. I have extensive experience developing high-performance Flutter applications, including a previous project where I successfully integrated real-time data streams into a user-facing mobile app, resulting in a 20% increase in user engagement. I will deliver a fully functional Flutter app with a clean, documented, and maintainable codebase using Dart and the Provider state management solution. The backend will be built with Node.js and PostgreSQL, handling user authentication, step data synchronization, token generation, and marketplace transactions. The app will feature intuitive UI elements for step tracking and reward redemption, visualized with charts and progress indicators. What is the intended architecture for the dual-token reward system, specifically regarding how tokens will be minted and managed on the backend? Ready to start as soon as you confirm scope.
$600 USD in 21 days
5.2
5.2

Hello, Your project immediately caught my attention because I have worked on fitness and rewards based mobile platforms that required accurate activity tracking, secure backend logic, admin management, and smooth Flutter performance across both Android and iOS. I understand how important reliability and fraud prevention are when rewards and redemption systems are involved, especially with step tracking and token logic. I can help you complete the full flow from Flutter app development to backend APIs, admin dashboard, marketplace integration, payment handling, and publishing support. I also have experience working with Google Fit, Apple Health integrations, real time data handling, and secure account validation systems to reduce fake activity and abuse attempts. The combination of fitness tracking, reward conversion, digital marketplace features, and premium dark themed UI is a very exciting concept, and I would love to discuss the technical direction, timelines, and rollout plan with you in more detail. I can also share relevant app examples and explain how I would approach performance, security, and long term maintenance for the platform. Let’s schedule a quick discussion so we can review the scope and move toward the first phase confidently. I will share my portfolio in chat I look forward to hear from you. Thanks Best Regards, Mughira
$500 USD in 7 days
5.1
5.1

ooooooooooooooooooooooooooooooo Drawing from a decade of consistent success stories and a passion for staying current with latest technologies and strategies, I am confident that my skill set makes me the ideal Senior Full-Stack Flutter Developer to bring your Fitness & Rewards App to life. My strong grasp of API development is an asset for ensuring extensive integration capabilities with health gateways like Google Fit and Apple HealthKit. And my work with Flutter guarantees that you receive a clean, maintainable codebase that can effortlessly scale as your app's needs evolve. As the project outline emphasizes, security is paramount in your app's design. In this regard, my experience in implementing foolproof backend systems including device fingerprinting, strict server-side validation and IP Monitoring will be indispensable. I guarantee an anti-fraud system that doesn't compromise on quality or accuracy - essential for a dual-token economy where every step counts. My comprehensive experience in mobile app development extends beyond coding: I've built architectures from ground zero, delivered sophisticated UI/UX designs, ensured seamless integrations and enhanced digital marketplaces with swift API-based automated fulfillment. A creative visionary at heart, I'm more than prepared to combine your specific vision with my creative talents for an interface featuring a premium dark theme and opulent details draped in ancient Babylonian Blue and 3D Gold Accents.
$450 USD in 7 days
5.0
5.0

Hello, Yes, I have experience building secure Flutter apps with reward systems, marketplace features, and scalable backend architecture. ✅Your project especially needs strong anti-fraud protection because of the token economy, and I can handle: • Google Fit & Apple Health integration • Secure server-side step validation • Device fingerprinting & anti-multi-account system • VPN/proxy/emulator detection • Bronze & Gold token logic with daily caps • Admin dashboard & digital marketplace • Mastercard + USDT payment integration • Clean Architecture Flutter codebase I can also deliver the premium dark UI with Babylonian Blue and Gold styling exactly as requested. ✅You will receive: • Full source code & IP rights • App Store & Play Store deployment support • Post-launch support & bug fixing I can share published Flutter apps and similar work examples in chat. Thanks Mayank
$500 USD in 7 days
4.9
4.9

Hello, I’m a Senior Full-Stack Flutter Developer with experience building scalable mobile applications with secure backend architectures and premium UI/UX. I can develop your next-generation fitness & rewards app for both Android and iOS using Flutter with Clean Architecture for long-term maintainability and scalability. I have experience integrating Google Fit, Apple HealthKit, secure authentication systems, payment gateways, admin dashboards, and real-time APIs. I can also implement advanced anti-fraud protection including device fingerprinting, VPN/proxy detection, emulator blocking, server-side validation, and abuse prevention systems for secure token rewards. The app will include: • Accurate step tracking and reward calculations • Dual-token economy with daily earning caps • Secure admin dashboard and transaction management • Marketplace with automated gift-card fulfillment • Crypto and international payment integration • Premium dark-themed UI with Babylonian blue and gold styling • Full source code transfer with post-launch support I can first deliver a detailed architecture plan and UI prototype, then proceed with development milestones until Play Store and App Store deployment. Looking forward to discussing the project further and sharing relevant Flutter apps I’ve previously developed. Thank you.
$250 USD in 20 days
5.0
5.0

Baghdad, Iraq
Member since May 18, 2026
$250-750 USD
€8-80 EUR
$200-500 USD
$250-750 USD
₹100-400 INR / hour
$750-1500 CAD
₹150000-250000 INR
₹600-1500 INR
$10-30 USD
₹37500-75000 INR
₹600-1500 INR
₹600-1500 INR
£250-750 GBP
$15-25 USD / hour
₹12500-37500 INR
$250-750 USD
$10-30 USD
$30-250 USD
₹12500-37500 INR
₹250000-500000 INR
₹600-1500 INR