I help founders and teams build and launch new mobile apps, improve existing products, fix performance issues, and ship features faster using React Native, Flutter, Swift, and native Android technologies. I specialize in Flutter and React Native app development handling everything from architecture and UI to backend APIs, Firebase integration, testing, and deployment to App Store and Play Store. 𝗪𝗵𝗮𝘁 𝗜 𝗯𝘂𝗶𝗹𝗱 (𝗮𝗻𝗱 𝘄𝗵𝗮𝘁 𝗜’𝗺 𝘀𝗲𝗮𝗿𝗰𝗵𝗲𝗱 𝗳𝗼𝗿): • React Native App Development (TypeScript, Expo, native modules when needed) • Flutter App Development (Dart, pixel-perfect UI, smooth animations) • iOS Developer work (Swift / SwiftUI) for native features & performance • Android (Kotlin) for platform-specific modules • Firebase backend (Auth, Firestore, Cloud Functions, Push Notifications) • Payments (Stripe), Maps, Chat, Real-time + Offline Sync • MVP development for startups — from wireframe to live app • Backend systems with Node.js, Laravel, or custom APIs • Performance, security, and scalability improvements If you’re hiring because you need certainty (not “hours”), here’s what you get: ✅ A clear build plan (milestones, scope, timeline, risks) before we start ✅ App Store-ready delivery (builds, signing, TestFlight, Play Console) ✅ Scalable code (TypeScript/Dart patterns, modular structure, maintainable UI) Industries & platforms I've worked on 👇 Mobile Apps (Flutter / React Native / Swift / Kotlin): Food delivery, taxi booking, health & fitness, education, e-commerce, social apps, music, restaurant management, Food delivery app, Ride booking app (like Uber), Real estate listing app (Like Airbnb), Social media mobile app (like TikTok/Instagram), Startups/Investment management mobile app, Wellness mobile app, Fitness and Nutrition mobile app (like CalAI, MyFitnessPal), Sports mobile app, E-commerce mobile app, Language Learning Mobile App (Like Duolingo), Event management mobile app, Grocery/Meal Planning mobile app, Freelance mobile app, Service Booking Mobile App (Home/HVAC), Inventory Management Mobile App, Learning Management Mobile App, Appointment Booking Mobile App (Salon/Doctor), Venue Booking Mobile App (Sports/Events), Task Management Mobile App (Project Management/To-Do), On-Demand Custom Mobile Apps Web & Software Platforms: ERP, CRM, inventory systems, POS, booking platforms, marketplaces, real estate, SaaS products 𝗣𝗿𝗼𝗼𝗳 & 𝗱𝗲𝗹𝗶𝘃𝗲𝗿𝘆 𝘀𝘁𝘆𝗹𝗲: • 100% JSS | $80K+ earned | 2500+ hours | 100+ projects • Figma → working app with matching UI, responsiveness, and edge cases covered • Regular updates + clean documentation so you’re never guessing progress I've worked on 100+ projects, helping clients turn ideas into stable, production-ready apps that are easy to maintain and scale. If you're looking for a developer who takes full ownership of your product through the complete mobile app development lifecycle — let's talk. All discussions are kept confidential and can be covered under NDA. Mobile App Development | Mobile App Developer | Flutter | Flutter App Development | React Native | React Native Development | iOS Development | iOS App Development | Android App Development | Android Developer | Cross-Platform App Development | Hybrid App Development | Native App Development | AI Mobile App Development | AI App Development | Full Stack Mobile App Development | MVP Development | Firebase | Node.js | API Integration | OpenAI API | Kotlin | Swift | Dart | App Store Deployment

Senior Mobile Developer | Flutter & React Native Specialist 🚀 Architecting Scalable Mobile & Full-Stack Solutions Since 2014 💼 12+ Years of Engineering Excellence | Enterprise & Startup Scale ⚡ Hyper-Responsive Communication — Clear, Direct, and Action-Oriented Hi, I’m Sumanta. As a Senior Mobile Developer and Full-Stack Engineer, I specialise in building high-performance, cross-platform mobile applications and robust web ecosystems that scale seamlessly with your business growth. Over the past 12 years, I have partnered with startups and established enterprises worldwide to translate complex product visions into production-ready software. Whether you need a crisp MVP built from the ground up or a complex technical audit to optimize an existing app's performance and state management, I deliver future-ready code that performs flawlessly across devices. Core Capabilities ––––––––––––– -- Cross-Platform & Native Mobile Engineering -- Frameworks: Flutter, React Native (High-performance, single-codebase solutions) -- Native Development: iOS (Swift, Objective-C) & Android (Kotlin, Java) -- Optimization: Offline-first caching, real-time data synchronization, and advanced state management (Riverpod, BLoC, Redux). -- Advanced Features: AI integrations, secure digital wallets, and custom API/hardware interactions. Full-Stack Web Ecosystems & Architecture –––––––––––––––––––––––––––––––––– -- Modern Frontends: React, Next.js, and responsive web frameworks. -- Scalable Backends: Node.js (MERN/MEAN), Python (Django/Flask), and Laravel. -- APIs & Data: Secure RESTful & GraphQL API design, Firebase, and Firestore integration. -- Content Management: Headless CMS architectures and custom WordPress solutions. Why Clients Partner With Me ––––––––––––––––––––––––– -- Architectural Integrity: I don't just write code; I design clean, maintainable software architectures that your team can scale for years to come. -- Transparent Communication: You will always know exactly where the project stands. I prioritize proactive updates and fast, 30-minute response windows. -- Product-Minded Approach: I look at your project through a business lens, ensuring the technical execution perfectly supports your user experience and retention goals. -- End-to-End Reliability: From deep technical discovery and initial build-ready designs to post-launch support and performance tuning, I am dedicated to your long-term success. Let's build an application that drives your business forward. Click the "Invite to Job" or "Message" button above, and let’s discuss your technical goals.

Hi, I’m Shah Fahad, a Full-Stack Developer specializing in React.js, Next.js, and React Native with 4+ years of experience building high-performance web and mobile applications. I help businesses create scalable, responsive, and SEO-friendly applications using modern JavaScript frameworks. Whether you need a React developer, Next.js expert, or React Native app developer, I can deliver reliable and efficient solutions tailored to your needs. 🔹 Core Skills & Services ✔ React.js Development – Modern, fast, and interactive web apps ✔ Next.js Development – SEO-friendly, server-side rendered (SSR) apps ✔ React Native Development – Cross-platform mobile apps (iOS & Android) ✔ Frontend Development – Responsive, pixel-perfect UI/UX ✔ TypeScript & JavaScript (ES6+) – Clean and scalable code ✔ Performance Optimization – Faster load times and better user experience ✔ API Integration & Backend Support – Seamless data handling ✔ Legacy App Migration – Upgrade old apps to modern React stack 🔹 Why Clients Choose Me ✅ Proven Experience – 25+ successful web and mobile projects ✅ Clean & Maintainable Code – Following industry best practices ✅ Strong Communication – Clear updates and smooth collaboration ✅ Reliable Delivery – Consistent on-time project completion ✅ Long-Term Support – Maintenance and future improvements 💡 Let’s Work Together Looking for a React.js, Next.js, or React Native developer to build or improve your project? Send me a message—I’m ready to discuss your requirements and get started.

✅ 12+ Years in Development ✅ 100% Job Success Over 10 years ✅ 100% Customer Satisfaction ✅ Top 1% Upwork Talent Hi, I'm Umar, an expert-vetted Full-stack engineer having expertise in React, Next.js, Node.js, Angular, Python, React Native and SQL/NoSQL. I have a solid background in technologies such as JavaScript (ES6, ES7, Ajax, JSON, XML) and its frameworks such as Node.js, Express.js and for the front-end I have used React.js, Angular.js and Vue.js as well as Typescript both for frontend and backend development. I have great skills in following - Full Stack Development ( HTML, CSS, JS, Bootstrap, MySQL, NodeJs, React, Redux) - Mobile UI Design and Prototyping ( Sketch ) - XML and JSON Parsing - API Integration ( Alamofire ) - CoreData and Realm - Source Control Systems like Github, Bitbucket and Tower - Third-party SDKs' integration ( Cocoapods ) - Facebook, Twitter and Gmail API integration - Twilio API integration ( SMS and Programmable Video Chat ) - Familiarity with Management Tools like Trello, GitHub and Jira - Adobe Photoshop and Illustrator - Graph API ( Facebook Public data fetching like images, feeds and bio) - Google Maps Integration - Google Placepicker Integration

🌟🌟🌟🌟🌟 - "I wouldn't recommend Hasan, because I wouldn't want others to take his time"- my awesome Upwork client If you are looking to create exceptional user experiences through Mobile applications then you're in the right place. With 5+ years of experience in React Native development, I have worked closely with a variety of clients from renowned MNC's to bootstrap start-ups to deliver results that meet business objectives and exceed user expectations. What you can expect from me: ✅ Clear & timely communication: I will respond promptly to all messages and keep you informed throughout the project ✅ High-quality work: I am committed to delivering work that meets or exceeds your expectations and meets all requirements. ✅ Professionalism: I will conduct myself with professionalism and respect at all times, and will be proactive in identifying and addressing any issues that arise. ✅ Attention to detail: I will carefully review all work to ensure that it is error-free and meets all specifications. ✅ Collaborative approach: I am open to feedback and will work with you to make any necessary revisions or adjustments to ensure that the final product meets your needs. When it comes to my set of expertise I am primarily a Mobile app developer, specializing in React Native (CLI and Expo). I have created and improved multiple successful applications for clients in areas of health tracking, Accounts Management, Fintech, Distribution Management, Recruitment, lifestyle, and e-commerce. Here's how I can help you: 🔷 Building an app from ideation to MVP and beyond 🔷 Revamping, debugging and updating existing applications that needs quick fixes or an idea to scale 🔷 Integrate new or existing applications with popular back-ends like Firebase or API's like RESTful, GraphQL 🔷 Consult on feature possibilities, App Store/Google Play guidelines, and monetization strategies 🔷 Proficient in E2E (End-to-End) testing, unit testing, and code reviews to ensure high-quality deliverables & low margin for error 🔷 Creating integrations of BLE-enabled (Bluetooth Low Energy) devices such as printers, Stripe terminals and smartwatches (Apple Watch, Fitbit) 🔷 Develop Apps using best practices which ensures optimal app performance & total app size Through my work I have gotten a chance to collaborate with and learn from the experiences of some of the most talented professionals from across the globe and look forward to instilling the insights I have gained on our next project. Robust technology and business experience combine for strong project outcomes no matter the size. I welcome discussing your projects and helping you find success!

Top Rated full-stack & AI developer with 100% Job Success, $200K+ earned, and 7,000+ hours across 60+ projects. I build AI-powered web and mobile apps with Node.js, React, React Native, PHP, and Laravel. WHAT I DELIVER: • Web applications — React/Next.js frontends, Node.js & Laravel backends, REST APIs • Mobile apps — cross-platform iOS/Android with React Native (one client kept me on for 4+ years) • AI integrations — OpenAI/Claude APIs, chatbots, and automation built into your existing product • E-commerce — WooCommerce and custom storefronts, payments, Twilio/Salesforce/AWS integrations HOW I WORK: clean, unit-tested code, Agile sprints, and constant communication on Slack/Jira/Asana or your preferred tool — including support after delivery. I'm comfortable with strict deadlines and rapid-turnaround projects. RECENT HIGHLIGHTS: a high-rated marketplace app on AWS + Salesforce + Twilio, a precious-metals e-commerce platform on WooCommerce, and SMS routing systems processing thousands of messages daily. Send me a message with what you're building — I'll respond within a few hours with a concrete approach.

Senior Mobile App Developer specializing in iOS (Objective-C/Swift/SwiftUI), React Native and Flutter with 11+ years of experience building production-grade mobile applications. I help startups and product teams to build scalable apps, integrate complex features, and ship reliable releases to the App Store and Google Play Store. Before full-time freelancing, I spent 9 years as a full-time mobile engineer - growing from Junior iOS Developer to Senior iOS and React Native Developer at a product-focused software company. I wasn't job-hopping. I was building. During those years I worked on real production apps, made architectural decisions, integrated hardware devices, and solved the kind of problems that appear only after an app reaches real users. In 2023 I moved into freelancing with one goal: bring the same engineering discipline and product mindset to companies that want more than average freelance work. Since then: 🏅 Top Rated on Upwork ✅ 100% Job Success Score ⏱ 2k+ hours logged 🤝 Long-term client relationships ━━━━━━━━━━━━━━━━━━━━━━━ WHAT I CAN HELP YOU WITH ━━━━━━━━━━━━━━━━━━━━━━━ • iOS apps built with Swift & SwiftUI - scalable and App Store ready • Cross-platform apps using React Native (JavaScript/TypeScript) or Flutter • BLE & NFC integrations for IoT and hardware devices • Real-time features such as live streaming, chat, and location tracking • Stabilizing and refactoring poorly architected mobile apps • App Store & Google Play deployment, including rejection fixes ━━━━━━━━━━━━━━━━━━━━━━━ TECHNICAL EXPERTISE ━━━━━━━━━━━━━━━━━━━━━━━ iOS Development (11+ Years) • Swift, SwiftUI, UIKit, Objective-C • CoreBluetooth (BLE), CoreNFC • HealthKit, Apple Sign-In, OAuth • In-App Purchases & Subscriptions • Push Notifications (Firebase, OneSignal, Azure) React Native (6+ Years) • TypeScript, Redux, MobX, Redux-Toolkit • Native module bridging (iOS & Android) • Performance optimization & debugging • React Native upgrade to latest stable version Flutter (2+ Years) • Dart, GetX, Riverpod • Complex UI and API integrations API Integration & Mobile Tooling • REST & GraphQL API integration • Firebase services (Authentication, Messaging, Firestore), Supabase • Monitoring tools (Crashlytics, Sentry, Amplitude) • Mobile CI/CD pipelines (GitHub, GitLab, Bitbucket) • Agile collaboration (Jira, ClickUp, Monday) ━━━━━━━━━━━━━━━━━━━━━━━ INDUSTRIES I'VE BUILT APPS FOR ━━━━━━━━━━━━━━━━━━━━━━━ • Healthcare platforms (HIPAA-compliant systems) • IoT & hardware device communication • Dating & social networking platforms • Live streaming applications • Fitness & wellness apps • Ride-sharing and rental systems • Location-based apps using maps and geofencing ━━━━━━━━━━━━━━━━━━━━━━━ WHY CLIENTS WORK WITH ME LONG TERM ━━━━━━━━━━━━━━━━━━━━━━━ ✔ 11+ years of professional mobile engineering experience ✔ Clean architecture (MVVM, MVC, Clean Architecture) ✔ Consistent communication and daily progress updates ✔ Focus on product stability, scalability, and performance ✔ Engineering mindset, not just task execution ━━━━━━━━━━━━━━━━━━━━━━━ I work with a limited number of clients at a time so each project receives proper engineering attention rather than rushed freelance delivery. If you're building a mobile app, improving an existing one, or dealing with a complex codebase that needs to be stabilized or scaled, feel free to send an invite. I’ll review your requirements and respond with an honest technical assessment within 24 hours. Let's build something worth downloading.

I’m a hardworking and detail oriented full-stack web and mobile architect who’s helped companies both small and large maintain their online presence for over a decade. I understand that every customer is different and I can easily adapt to any environment to tailor solutions that fit your needs, whether it’s a small bootstrap startup or a large enterprise. I will work with you one-on-one to create a strategy focused on product delivery, growth, and technical excellence. My specialties include cloud services (e.g. AWS, Azure, Google Cloud), real-time systems, business intelligence, big data, enterprise web apps, scalability, education, and open source software. My full stack experience includes Node, and Express/Nest/Hapi/Loopback, and MongoDB as well as more traditional technologies like PHP, ASP.NET, and Python. Additionally, I have extensive knowledge of front-end JavaScript and browser APIs as well as significant experience with popular frameworks and libraries like React, Vue and Redux. I’m a self starter and I love working on new and challenging projects that push me to my limits and allow me to learn and grow.

✅ Rewarded as 🏆 𝗧𝗢𝗣 𝗥𝗔𝗧𝗘𝗗 𝗣𝗟𝗨𝗦 🏆 by Upwork (𝗧𝗼𝗽 𝟯%) ✅ 4,000+ hours and still counting ✅ 19+ jobs completed successfully ✅ 100% Job Success (Client Satisfaction Ratio) ✅ High-Quality Work ✅ Budget-friendly ✅ Fluent English ★ I build solutions with the mindset of a product owner, not just a developer. With 14+ years of experience, I’ve designed, developed, tested, and successfully published multiple iOS and Android applications used in real-world environments. My core strength lies in building scalable, high-performance apps across native iOS (Swift, Objective-C), native Android (Kotlin, Java), and cross-platform frameworks like React Native and Flutter. I’ve built rich, responsive user interfaces, worked extensively with client-server architectures, and integrated complex backend systems and third-party services. My experience also includes developing SDKs, creating custom native modules, hardware (bluetooth/wifi/usb based) integration/communication and handling end-to-end deployment pipelines using CI/CD tools like Jenkins, CircleCI, App Center. From a technical standpoint, I focus on: ★ Clean Architecture, MVVM, modular and scalable codebases ★ Performance tuning (memory, rendering, network layers) ★ API integrations (REST, GraphQL, WebSockets) ★ Background processing, caching strategies, and offline-first approaches ★ Secure authentication, real-time features, and push notification systems ★ Using AI-assisted tools (Cursor, Claude) to accelerate delivery while maintaining high code quality. ★ Migrate legacy systems using modern tools, technologies, and scalable architectures. I’ve delivered solutions across fintech, IoT, healthcare, navigation, logistics, social platforms, and eCommerce, so I understand both technical complexity and business expectations. Beyond mobile, I work with Node.js and Python to design complete backend systems, including API layers, database design (SQL/NoSQL), authentication flows, and scalable infrastructure. This allows me to take full ownership of a product instead of working in silos. In the AI/ML space, I’ve been actively building and integrating practical solutions into applications. My experience includes: ★ LLM integrations (Claude, OpenAI, Gemini) for intelligent workflows, chat, and content processing ★ Python-based ML experimentation using TensorFlow and scikit-learn ★ Computer vision use cases using OpenCV and related APIs ★ Prompt engineering and structured output pipelines for automation ★ Embedding AI features directly into mobile apps for real-time user interaction I don’t believe in over-engineering or hype-driven development, whether it’s mobile architecture or AI. I focus on building solutions that are stable, maintainable, and aligned with business goals. If you’re a startup or growing business, I can help you: ★ Turn your idea into a solid MVP or prototype ★ Scale your existing app with better architecture and performance ★ Integrate advanced features like chat, real-time updates, maps, payments, or AI ★ Set up proper CI/CD, release pipelines, and development workflows I usually work in structured, outcome-driven sprints, helping you move fast while keeping the codebase clean and future-ready. If you’re tired of working with developers who just “deliver tasks” and disappear, and instead want someone who takes ownership, thinks long-term, and collaborates closely, we’ll work well together. Free High-Value Offerings 💬 30-minute consultation to understand your idea and suggest the right technical approach. 🔍 High-level review of your existing app or concept with actionable improvement suggestions. 🤖 AI use-case consultation, practical ideas to integrate AI where it actually adds value. 📋 MVP planning session to break your idea into clear phases and a realistic roadmap. ⚡ Initial guidance to identify possible root causes and next steps on app crashes or performance. Let’s build something meaningful and make it last.

With 4+ years of experience and 40+ apps delivered, I specialize in building high-performance mobile and full-stack applications that are scalable, user-friendly, and production ready. I help startups and businesses turn ideas into complete digital products, from mobile apps to full-stack web platforms. If you are looking for a developer who can build both your mobile app and backend or web dashboard, I can help you deliver everything in one place. What I Do I handle end-to-end development including mobile apps, backend systems, and web platforms. React Native mobile apps (iOS & Android using CLI and Expo) Full-stack web apps using Next.js and MERN stack Backend development using Node.js, Express, Firebase, Supabase API development and third-party integrations Real-time features like chat, sockets, and live updates Payment systems, subscriptions, and authentication App Store and Google Play deployment My Expertise React Native (CLI & Expo) Next.js, React.js Node.js, Express.js MongoDB, Firebase, Supabase JavaScript, TypeScript REST APIs and third-party integrations Real-time systems (chat, notifications) Stripe, RevenueCat, in-app purchases Maps, location-based apps CI/CD and deployment Types of Applications I Build Mobile apps for iOS and Android SaaS platforms and dashboards Marketplace and booking systems E-commerce applications AI-powered apps with OpenAI integration Real-time chat and social apps Admin panels and business tools Why Clients Choose Me Delivered 40+ mobile and web applications Strong focus on performance and scalability Clean, maintainable, and production-ready code Clear communication and reliable delivery Long-term support and collaboration How I Work I focus on understanding your business goals first, then building a solution that is scalable and easy to maintain. I keep communication clear, provide regular updates, and ensure the product is built for real users from day one. What You Can Expect High-quality mobile and web applications Smooth and efficient development process Fast response and reliable communication Long-term support after delivery If you are looking for a developer who can handle both mobile apps and full-stack web development, feel free to reach out.