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👋 Hey, thanks for stopping by my profile. 🚀 Flutter Developer | AI-Powered Builds | Top Rated Plus on Upwork I've spent the last 8 years turning app ideas into things people actually use. Most of that has been deep in Flutter, building cross-platform apps that feel native on both iOS and Android — but I've also worked with native Java/Kotlin, full-stack web, and a handful of other languages along the way (JavaScript, PHP, HTML/CSS, Dart, Vue Js, React and AWS). Lately, I've been a bit obsessed with how AI changes the way I work. I use AI-assisted tools to prototype faster, catch bugs earlier, and iterate quicker — which means you get the same quality, just sooner and often for less. And when a project calls for speed over a full custom build, I'll reach for no-code and low-code tools to get an MVP in your hands fast, so you can test the idea before sinking a budget into it. 🌟 Why Choose Me? ✔ Expert in Flutter: I craft cross-platform apps with native-like feel and performance — one codebase for iOS and Android means lower cost and faster time-to-market. ✔ AI-Powered Productivity: I integrate AI tools into my development process to accelerate delivery without cutting corners — faster prototyping, smarter debugging, automated testing, and quicker iterations. You get the same quality, delivered sooner. I also build AI features into apps: chatbots, smart search, content generation, and API integrations with leading AI models. ✔ No-Code & Low-Code Solutions: When speed and budget matter most, I leverage no-code and low-code platforms to stand up MVPs, internal tools, and rapid prototypes — so you can validate your idea quickly before investing in full custom development. ✔ Custom App Development: Whether you need a sleek UI, complex functionality, or third-party integrations, I tailor your app to your exact specifications. ✔ Strong Problem Solver: I thrive on challenges. No matter the complexity, I'm committed to finding the best solution to meet your goals. ✔ Responsive Communication: Clear, transparent communication drives successful projects. I'm available to discuss progress, answer questions, and address concerns promptly. Here's what I'm good at: 🌟 Flutter & mobile Development: ✔ clean, responsive UI ✔ Firebase ✔ push notifications ✔ Google/Facebook/Apple sign-in ✔ Maps ✔ ads ✔ API integration ✔ Basically, everything it takes to ship a polished app. 🌟 AI features & automation user of AI tools ✔ adding chatbots, smart search, and content generation into apps, plus integrating the major AI models via API. I also automate the boring parts of a workflow so the app (and the team behind it) runs leaner. ✔ Claude code, Cursor, and many more 🌟 No-code / low-code ✔ Fast MVPs, internal tools, and quick prototypes when validating an idea matters more than a from-scratch build. 🌟 Full-stack ✔ REST and GraphQL APIs, auth, SQL and NoSQL databases, deployment, and third-party integrations. Comfortable across AWS too. What it's like working with me: I'm a straightforward communicator — I'll keep you in the loop, flag issues early instead of at the deadline, and tell you honestly if I think there's a better way to do something. I genuinely like solving hard problems, so the messy, complicated projects don't scare me off; they're usually the fun ones. If you've got an idea — I'm committed to your project's success. Let's collaborate to create an app that exceeds your expectations. Talk soon, Sheetal S.

Are you building a product that needs to scale to 1M+ users? With 9+ years of experience across 30+ international startups, I have architected and deployed over 50+ full-stack applications including a flagship app that achieved 1M+ downloads on the App Store. As a Top-Rated freelancer with a 100% Job Success Score, I specialize in "Whole Product" engineering. I bridge the gap between high-performance mobile interfaces and robust, scalable backends, eliminating the friction of managing separate frontend and backend teams. * What this means for you: Rapid prototyping, automated unit testing, and faster feature deployment without sacrificing code quality. * The Result: You get Enterprise-Grade architecture at Startup speeds. I have expertise on complex logic, security, and UX, while automating the boilerplate. Proven Track Record: * Healthcare & Biometrics: Developed complex BLE (Bluetooth Low Energy) integration for real-time health monitoring with 99% connection reliability. * High-Load Scaling: Optimized APIs for PrioritySoft, reducing response time from 4s to <200ms and cutting infra costs by 40% while handling millions of requests. * Market Success: Built and scaled "SipSkip" from MVP to multi-city production usage.
 Technical Arsenal: * Mobile (Hybrid & Native): Flutter (Expert), Kotlin, Swift, React Native. Pixel-perfect UI, complex animations, and state management (BLoC, Riverpod). * Backend & Cloud: Python (Django/FastAPI), Node.js, AWS (EC2, S3, RDS, Lambda), Docker, CI/CD pipelines. * Database: PostgreSQL, MongoDB, optimized for high-concurrency. I treat every project as if I am the CTO. This means clear communication, realistic milestones, and code that is clean, documented, and ready for your future team to inherit. Ready to turn your vision into a scalable reality? Let's discuss your roadmap.

WHO I AM 7+ years of production mobile development. 5x world record holder in tech, including a Guinness World Record. 2025 Misk Global Tech Award winner. Senior Software Engineer at Microsoft on the Teams platform 300 million daily users by day. Most mobile apps fail not because of bad ideas, but bad engineering. I build iOS and Android apps that are fast, maintainable, and built to scale whether you're launching your first MVP or fixing what a previous team left behind. THE PROBLEM I SOLVE I ship products that scale. You are not hiring a coder, you are hiring someone who will take ownership, deliver on time, and leave you with code your team can actually maintain. I have built healthcare systems for hospitals, enterprise apps at Microsoft used by 300 million daily users, and production apps that handle real payment flows and real data. I know what it takes to ship software that does not break when it matters. That is the difference between a freelancer and a partner. I am the latter. SELECTED WORK ORRCA, live healthcare platform across 4 Vancouver hospitals. Manages patient records, clinical workflows, and real-time data sync with HIPAA compliance. Built with React Native and a secure Supabase backend. Kinetix, iOS and Android physiotherapy app for ACL injury rehabilitation. HealthKit integration, video-guided exercises, offline functionality, and progress tracking. Built with Flutter. PawMatch, pet services marketplace connecting sitters with pet owners. Swipe-based matching, real-time messaging, Stripe payment processing. Flutter and marketplace architecture at scale. Beauty Appointment App, progressive web app for beauty appointment booking. Cross-platform mobile and web, optimized for conversion. FlutterFlow with real-time backend sync. Microsoft Teams, enterprise mobile app, 300 million daily users. WHAT I BUILD React Native and Flutter apps for iOS and Android Cross-platform mobile app development and MVP delivery Gamification systems — XP engines, streaks, quests, leaderboards BLE hardware and IoT device integrations Stripe Connect with marketplace payments, subscriptions and split payouts Supabase and Firebase backends with row-level security AI and ChatGPT feature integrations HealthKit and Health Connect integrations Full App Store and Google Play submission and compliance Admin dashboards and web applications Node.js backend and REST API development TECH STACK Mobile: React Native, Flutter, Expo, iOS, Android Backend: Supabase, Firebase, Node.js, REST API, AWS Payments: Stripe Connect, in-app purchases, subscriptions AI: OpenAI, ChatGPT integration, AI-powered mobile apps Health: HealthKit, Health Connect, BLE devices INDUSTRIES I HAVE BUILT FOR Healthcare and medical platforms Enterprise software and SaaS Consumer health and wearables Fintech and payments Marketplace and two-sided platforms Community and social platforms Fitness and wellness apps Education and e-learning WHY I AM DIFFERENT Ownership Mentality. I do not just write code, I care about your success. Your problem becomes my problem. I will not ship something unless I would be comfortable using it myself. Clarity and Predictability. NDA before sensitive discussion. Scope and milestones locked before any code. Weekly check-ins. GitHub and Supabase access on Day 1. You own everything from the start. No surprises. Selective Not Desperate. I turn down projects that are not the right fit. This means you get my full focus, not a divided contractor juggling 20 clients. Enterprise Standards at Freelance Speed. Microsoft-quality code. Clean architecture. Security baked in. Performance optimized from Day 1. WHO I WORK BEST WITH Funded startups, growing companies, and enterprises who need a senior mobile app developer, not a code monkey. If you have a spec, a timeline, and a real budget, we will work well together. HOW WE WORK TOGETHER Step 1. Message me with your scope. I will respond within 24 hours and tell you if I am the right fit. Step 2. Alignment call. We discuss your product, timeline, and expectations. No surprises. Step 3. Scope locked. Milestones, deliverables, and timeline in writing before any code. Step 4. Day 1 ownership. GitHub, Supabase, and all credentials transferred to you. You own the code from the start. Step 5. Weekly check-ins. Video sync to keep you updated. No ghosting, no excuses. If your project is serious, message me with your scope. I will tell you within 24 hours if I am the right fit. If I say yes, you have my full commitment. Best Rayyan Siddiqui

✨ Top Ranked Freelance Worker 📱 8+ Years of Experience in Mobile App Development ⏳ 5,000+ work hours on Upwork completed | 90%+ success on jobs 💼 Trusted by Over 132 Clients | Client Recommendation Rate of 99% 🚀 Why Choose Me? ✅ Proven Expertise 🔹 Delivered high-quality, scalable applications in a variety of verticals of Fintech, E-commerce, Healthcare, IoT. 🔹 Proficient in cross-platform mobile app development with React Native and Flutter. 🔹 Advanced proficiency in iOS (Swift, SwiftUI) & Android (Kotlin, Jetpack Compose) for native app development. 🔧 Multi-Faceted Services 🛠️ Custom Android, iOS & Hybrid app development. 🔗 Backend API implementation with Node.js, MERN stack & Laravel. 📡 Seamless third-party API integration and microservices-based architecture on AWS & Firebase. 🎨 SEO-Optimized App Design 🎯 Expert in designing user-centric, responsive, and beautiful mobile app designs with Figma & Adobe XD. 📊 Results That Matter 🔹 90% Client Retention Rate – Building lasting connections. 💰 Cost-effective solutions that maintain quality. 🏆 Industries that I Specialize in ✔ Fitness & Well-being – Fitness exercise apps, food tracking apps. ✔ Healthcare – Telemedicine (HIPAA-compliant), records of health. ✔ E-commerce – Grocery shopping apps, food delivery, tracking technology. ✔ Fintech – Budgeting apps, payment gateways, crypto wallets. ✔ Social Networking – Social networking websites, dating websites. ✔ Transportation & Logistics – Ridesharing platforms, fleet operations. ✔ IoT & Smart Devices – Monitoring solutions based on NFC/Bluetooth technology. ✔ Blockchain – Smart contracts, decentralized applications, tokens. 🔍 Technical Skills 📱 Mobile App Development: React Native, Flutter, Kotlin, Swift, SwiftUI, Dart. 🖥️ Backend: Node.js, Express.js, Laravel, REST APIs, GraphQL. 📊 Databases: MySQL, PostgreSQL, MongoDB, Redis, Elasticsearch. ☁ Cloud Platforms: AWS, Firebase, Supabase. 🎨 Frontend: React.js, HTML5, CSS3, TypeScript. 🚀 Emerging Technologies: AI, IoT, AR. 💼 Services Offered 1️⃣ End-to-End Mobile App Development (iOS, Android & Hybrid). 2️⃣ UI/UX-Focused App Design powered by cutting-edge technology. 3️⃣ Backend/API Development & Seamless Integrations. 4️⃣ Ongoing Support & App Maintenance. 5️⃣ Quality assurance and bug fixing. 🤝 Let’s Work Together! If you need a dedicated developer to make your app vision a reality with precision, ingenuity, and perseverance, let’s get in touch! 📩 Free Consultation: To discuss your project details, click on ‘Invite to Job’. Mobile App Developer, React Native Developer, Flutter Developer, iOS App Development, Android App Development, Hybrid App Development, Blockchain, IoT Mobile App, Fintech App Development, Healthcare Apps, Fitness Apps, Mobile App Design.

I am a full-stack and mobile engineer who builds systems that hold up in production , not just in demos, 8+ years , 60+ apps shipped , 30+ live on App Store & Play Store. My edge is not the stack. It's the architecture mindset , modular code, clean API contracts, scalable cloud infrastructure, and CI/CD pipelines that let you ship fast without breaking things. 𝐈𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐞𝐬 𝐈 𝐬𝐞𝐫𝐯𝐞𝐝: 🏥 Healthcare · 🛒 eCommerce · 🚚 Logistics · 📲 On-demand · 🏢 Enterprise SaaS · 💰 Fintech · 🎓 EdTech · 🏠 Real Estate · 🍔 Food & Restaurant · 🚗 Ride-hailing · 💪 Fitness & Wellness · 🔒 Cybersecurity · 🏗️ Construction & Field Service 📱 𝐌𝐨𝐛𝐢𝐥𝐞 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 ✅ Flutter (Dart) & React Native, production-grade cross-platform development ✅ Background geofencing · Real-time BLE sync · Offline-first architecture · Live location tracking ✅ State management (BLoC, Riverpod, Redux, MobX) · Push notifications · Deep linking ✅ Stripe · PayPal · In-app purchases · Google Maps · Firebase ✅ Real-time chat · WebSockets · Social auth (Google, Apple, Facebook) ✅ REST APIs · GraphQL · Third-party SDK integration 🌐 𝐖𝐞𝐛 & 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 ✅ Front-end: React.js · Next.js · Vue.js · TypeScript · Tailwind CSS ✅ Back-end: Node.js · NestJS · Express.js · FastAPI · Django · GraphQL ✅ Databases: PostgreSQL · MySQL · MongoDB · Firebase · Redis ✅ Cloud: AWS (EC2, S3, Lambda, RDS) · Google Cloud · Heroku ✅ Microservices · REST & GraphQL APIs · Serverless architecture ✅ CI/CD · Docker · Kubernetes · Git · Agile 𝐖𝐡𝐚𝐭 𝐲𝐨𝐮 𝐠𝐞𝐭: ✅ Clean, documented, handover-ready code ✅ Architecture explained, not hidden ✅ Communication that doesn't vanish mid-project 𝐌𝐞𝐬𝐬𝐚𝐠𝐞 𝐦𝐞 𝐰𝐢𝐭𝐡 𝐲𝐨𝐮𝐫 𝐛𝐫𝐢𝐞𝐟 , 𝐭𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐚𝐩𝐩𝐫𝐨𝐚𝐜𝐡 𝐛𝐚𝐜𝐤 𝐰𝐢𝐭𝐡𝐢𝐧 𝟐–𝟒 𝐡𝐨𝐮𝐫𝐬. 𝐊𝐞𝐲𝐰𝐨𝐫𝐝𝐬 Flutter Developer · React Native Developer · Full-Stack Engineer · Mobile App Development · Cross-Platform Development · Next.js · Node.js · NestJS · FastAPI · Django · REST API · GraphQL · API Integration · Firebase · AWS · Google Cloud · PostgreSQL · MongoDB · Redis · Docker · Kubernetes · CI/CD · TypeScript · BLoC · Riverpod · WebSockets · Microservices · Serverless · iOS · Android · App Store · Play Store

🏅𝐓𝐎𝐏 𝐑𝐀𝐓𝐄𝐃 𝐀𝐈 𝐂𝐨𝐧𝐬𝐮𝐥𝐭𝐚𝐧𝐭🏅 💼 10+ years in 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭📱𝐢𝐎𝐒 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 | Swift 🤖𝐀𝐧𝐝𝐫𝐨𝐢𝐝 Development | Kotlin ⚛️𝐑𝐞𝐚𝐜𝐭 𝐍𝐚𝐭𝐢𝐯𝐞 | TypeScript | JavaScript 🦋𝐅𝐥𝐮𝐭𝐭𝐞𝐫 | Dart 🛠️𝐔𝐈/𝐔𝐗 Design 🌐𝐀𝐏𝐈 Integration 🔄𝐖𝐞𝐛 𝐀𝐩𝐩 Development 🔒𝐒𝐞𝐜𝐮𝐫𝐞 Coding Practices My last ten years have been dedicated to Mobile Application development. In my applications, I have worked with bluetooth, WI-FI, real-time tracking, SQLite database, REST API, Camera Recognition, & many more interesting features. Throughout these years, I have become much skilled in developing full feature apps in both Objective-C and swift (for iOS Apps) and Java & Kotlin for Android apps. Many of the apps I have worked on are very high profile with names you would recognize. Although I can easily develop all aspects of an iOS app & Android app from the networking layer to the front end, I am particularly good at mobile analytics and front-end development. I was a creative person before I became a developer. As such, I have an eye for design. I find that most clients appreciate this. Since I started into this field, I hone my skills every day with the help of professional practice to make the development process faster and qualitative. 🌐 𝐅𝐥𝐞𝐱𝐢𝐛𝐥𝐞 𝐀𝐯𝐚𝐢𝐥𝐚𝐛𝐢𝐥𝐢𝐭𝐲 ✔ 𝐀𝐝𝐚𝐩𝐭𝐚𝐛𝐥𝐞 𝐭𝐨 𝐲𝐨𝐮𝐫 𝐭𝐢𝐦𝐞𝐳𝐨𝐧𝐞 (𝐄𝐒𝐓, 𝐏𝐒𝐓, 𝐌𝐒𝐓, 𝐂𝐒𝐓) 𝐟𝐨𝐫 𝐬𝐦𝐨𝐨𝐭𝐡 𝐜𝐨𝐥𝐥𝐚𝐛𝐨𝐫𝐚𝐭𝐢𝐨𝐧. 💎𝐍𝐨𝐭𝐚𝐛𝐥𝐞 𝐏𝐫𝐨𝐣𝐞𝐜𝐭𝐬 I’ve worked across diverse domains, including but not limited to:- ✅ Video Interviewing & Résumé Parsing Platform ✅ Modern and intuitive online platform for accessing PPSR reports ✅ Platform for Event management ✅ Better Now Healthcare Platform: Questionnaire, Appointments ✅ MassTextNow: Text Marketing Platform ✅ Revenue management portal. ✅ Shipping container calculators. ✅ Document management mobile app. ✅ Job board apps (Web & Mobile). ✅ SaaS solutions for healthcare and homecare. ✅ Compliance and license management systems. ✅ Course booking and scheduling systems. ✅ E-learning and language learning apps. ✅ Boutique hotel and e-commerce websites. ✅ Event posting and chat systems. ✅ Bible reading apps with subscriptions and in-app payments. ✅ Travel deal and grocery delivery platforms. ✅ SaaS for survey creation and response management. ✅ Real estate platforms with MLS integration. ✅ Food delivery mobile applications. ✅ Custom e-commerce solutions for fine wines, greeting cards, and equipment rentals. ✅ PDF annotation web applications. ✅ Dating and classified listing websites. List of my skills that I will use to bring your project to perfection: • Java / Kotlin, • Android SDK; • Android Jetpack (Room, Navigation, WorkManager, Lifecycle); • Google AppEngine (Google Cloud Endpoints / Servlets); • Databases: SQL / Room Persistence, Realm; • Google API's (Maps, Drive, Tasks, Places); • Firebase Cloud Messaging(Android / Java Server), Database, Remote Config; • Google Cloud Storage / Database; • Material Design; • REST/JSON/XML; • Retrofit 2, RxJava, Dagger 2; • MVVM, MVP; • OpenCV; • Gtk3.0 / Vala; • Git; • Gradle / Maven My Skills and Services ____________________________ -Technologies: Android studio, React native, Flutter etc. - iOS Programming - Swift Programming - Android Programming - Mobile App Design - Parsing - Payment Gateway Integration - Apple Map, Google Map, GPS, GEO location Service - Bar code scanner, QR Code scanner - Database management - Graphics/icon Design For App. - Third-party Push notification API like Air push etc. - Third-party SDK integration - All types of Social APIs like Facebook, Twitter, Linked In, Instagram..... etc. - Analytic Tool - Multiple Contact Selection messaging - Push Notification - In-App Purchase - Architecture - Code Management - Submit App to AppStore, Google Play ✅ AI & ML Skills: • Machine Learning Models: Building and integrating ML models using TensorFlow, PyTorch, and scikit-learn. • Natural Language Process Redux, Mobx, Flux, Swift, Objective C,Java, Kotlin, REST API, Twillio, Firebase, Social Integrations, Native Android App Developer, iOS App Developer, Cross-Platform Flutter App Developer, Top Flutter Developer, React Native, Hire Best MERN Stack Developer, RESTful API Developer, API Integration, Frontend Developer, React.js, Backend Developer, Nodejs, Javascript, Figma, UI/UX Design, Prototype, In-app purchases, Location, Payment Gateway Integration, Apple Xcode, Android Studio, Push notifications, User authentication, User profile creation, QA, Unit Testing, Regression Testing, Dating App, Ecommerce App, Ride Booking App, 3rd Party SDK Integration, Realm, SQLite, MySQL, Firebase Cloud Firestore, Realtime Database, Kotlin, Swift, Java, Dart, SwiftUI, Twilio, Mapbox, HealthKit, Alamofire, Google Analytics, Amazon Web Services, DigitalOcean, Core Data, UIKit, MapKit, Phone, Full Stack Developer, iPad, OpenAI ChatGPT LLM