𝟒𝟎+ 𝐦𝐨𝐛𝐢𝐥𝐞 𝐚𝐩𝐩𝐥𝐢𝐜𝐚𝐭𝐢𝐨𝐧𝐬 𝐬𝐮𝐜𝐜𝐞𝐬𝐬𝐟𝐮𝐥𝐥𝐲 𝐝𝐞𝐩𝐥𝐨𝐲𝐞𝐝 𝐭𝐨 𝐭𝐡𝐞 𝐀𝐩𝐩 𝐒𝐭𝐨𝐫𝐞 𝐚𝐧𝐝 𝐆𝐨𝐨𝐠𝐥𝐞 𝐏𝐥𝐚𝐲, 𝐰𝐢𝐭𝐡 𝐩𝐫𝐨𝐝𝐮𝐜𝐭𝐬 𝐈 𝐰𝐨𝐫𝐤𝐞𝐝 𝐨𝐧 𝐡𝐞𝐥𝐩𝐢𝐧𝐠 𝐬𝐞𝐜𝐮𝐫𝐞 𝐨𝐯𝐞𝐫 $𝟓𝟎𝟎𝐊 𝐢𝐧 𝐬𝐞𝐞𝐝 𝐟𝐮𝐧𝐝𝐢𝐧𝐠. I’m a 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 specializing in 𝐑𝐞𝐚𝐜𝐭 𝐍𝐚𝐭𝐢𝐯𝐞 I build and improve iOS and Android apps for startups, founders, agencies, and businesses that need clean execution, reliable performance, and a product that is actually ready for users. A good mobile app is not just a bunch of screens connected together. It is onboarding, navigation, performance, API handling, authentication, payments, push notifications, error states, App Store rules, and all the small details users notice right before they decide whether to keep the app or uninstall it with no emotional attachment. Where I usually add value: 📲 React Native mobile app development 🧩 MVPs and startup apps 🔗 Firebase, REST APIs, and backend integrations 🧠 AI features, LLM workflows, and smart app functionality 🔐 Authentication, payments, maps, chat, and push notifications 🛠️ Bug fixing, crash fixing, and performance optimization 📦 App Store and Google Play launch support I’ve worked with agencies and product teams that needed a dependable React Native developer who could jump into existing projects, handle overflow work, build features, fix issues, and keep things moving without needing a three-hour onboarding ceremony for every small task. I use Cursor, Claude, and ChatGPT as part of my AI-assisted workflow to work faster, debug smarter, and reduce repetitive development time. But AI stays where it belongs as a tool, not as the person making final decisions for your production app. My focus is simple: ✅ Clean code ✅ Smooth user experience ✅ Clear communication ✅ Scalable app structure ✅ Fewer “why is this broken?” moments If you need a Top Rated Mobile App Developer who can build, fix, improve, or scale your React Native app, add AI-powered features, or help prepare your app for launch, I’d be happy to help you get it done properly.

You have one shot to launch it right. Every week of delay, every half-built feature, every developer who ghosts after delivery costs you users, money, and momentum. I make sure that does not happen ✅ 10+ years building production iOS and Android apps for fintech, crypto, AI, and Web3 companies ✅ Senior Flutter and React Native developer, cross-platform from architecture to App Store ✅ Top Rated on Upwork with $100K+ earned ✅ Real shipped products with active users on both stores right now What I built: ✔ Mobile Apps: Flutter (Dart) and React Native (TypeScript) for iOS and Android. Startup MVPs, production rewrites, cross-platform apps, real-time systems, offline-first architecture, App Store and Play Store deployment. No supervision needed, no handholding, no gaps. ✔ Fintech and Crypto: non-custodial crypto wallets, Stripe payment integration, in-app purchases, KYC and KYT flows, trading platforms, multi-chain mobile wallets, fiat to crypto flows, banking app architecture. ✔ AI-Powered Mobile Apps: OpenAI API and Claude API integrations, LangChain workflows, RAG pipelines, AI chatbots, conversational interfaces, AI agents, on-device inference, LLM-driven automation built directly into mobile products. ✔ Blockchain and Web3: Ethereum, Solana, XRP Ledger, Bitcoin. Solidity and Rust smart contracts, DeFi protocols, NFT marketplaces, DAO governance, RWA tokenization, WalletConnect, MetaMask, multi-sig flows, dApp frontends. ✔ Backend and Infrastructure: Node.js, NestJS, REST APIs, GraphQL, WebSockets, Firebase, MongoDB, PostgreSQL, AWS, Docker, CI/CD pipelines. I own the backend, too, so you do not need a separate hire. Most clients come to me because they need one developer who owns the entire product: mobile app, backend, integrations, blockchain layer, and deployment. No coordination overhead. No gaps between layers. One clear line of responsibility. If you are building a fintech app, crypto wallet, AI-powered mobile product, or Web3 platform, send me your project details. I will respond with a clear technical plan and honest timeline within a few hours. Keywords: Flutter, React Native, iOS Development, Android Development, Mobile App Development, OpenAI API, LangChain, AI Chatbot Development, LLM Integration, Generative AI, Solidity Smart Contracts, Crypto Wallet Development, DeFi, NFT Development, Dart, TypeScript, Swift, Kotlin, Node.js, NestJS, Firebase, MongoDB, PostgreSQL, GraphQL, REST API, WebSockets, AWS, Docker, CI/CD, Stripe Integration, KYC, Payment Gateway, Ethereum, Solana, XRP Ledger, WalletConnect, MetaMask, RAG Pipeline, Claude API, AI Agent, Fintech App Development, Crypto Exchange, Trading Platform, MVP Development, Cross-Platform App Development

Hi, I’m Akshay Solanki 👋 I’m a React Native Developer with 8+ years of experience building mobile apps for iOS and Android. I mainly help startups and businesses: ✦ Build apps from scratch ✦ Improve existing apps ✦ Fix bugs and performance issues ✦ Add new features and integrations A lot of clients come to me when their app is slow, unstable, or the previous developer couldn’t complete the work properly. That’s usually where I step in. What I can help you with Mobile App Development → React Native (CLI & Expo) → Cross-platform apps for iOS & Android → Modern and user-friendly UI → App optimization and bug fixing → App Store & Play Store deployment → Authentication & user management Full Stack Development → Node.js, ExpressJS, NestJS → REST APIs & GraphQL → Third-party API integrations → MongoDB, PostgreSQL, MySQL → Firebase & Supabase → AWS / Azure / Google Cloud AI Features → OpenAI API integration → AI chatbots → Smart automation features → AI-powered mobile apps Industries I’ve worked with ✦ E-commerce & Marketplace ✦ Healthcare & Wellness ✦ FinTech & Payment Apps ✦ EdTech Platforms ✦ Logistics & Delivery ✦ SaaS & Startup MVPs ✦ Booking & Service Apps ✦ Social Networking Apps ✦ Fitness & Lifestyle Apps How I usually work I like to keep things simple and clear. 1. Understand your idea and requirements 2. Suggest the best approach 3. Build clean and scalable solutions 4. Test everything properly 5. Launch and provide ongoing support No over-promising. No confusion. Just honest and reliable work. Skills & Technologies Mobile ✦ React Native ✦ React Native CLI ✦ Expo ✦ iOS & Android Development Frontend ✦ React.js, Next.js ✦ JavaScript, TypeScript ✦ HTML5, CSS3 ✦ Tailwind CSS, Bootstrap Backend ✦ Node.js, ExpressJS, NestJS ✦ REST APIs & GraphQL Database ✦ MongoDB ✦ PostgreSQL ✦ MySQL ✦ Firebase, Supabase Cloud & DevOps ✦ AWS, Azure, Google Cloud ✦ Docker, Kubernetes ✦ CI/CD Pipelines ✦ Git, GitHub, GitLab Why clients work with me → Clear communication → Clean and maintainable code → Stable and scalable apps → On-time delivery → Long-term support Let’s keep it simple If you have an app idea or need help improving an existing app, feel free to send me a message. We can discuss your project and see if I’m the right fit 👍 ✅ Keywords React Native Developer | React Native Expert | React Native App Developer | React Native Mobile App Developer | Mobile App Developer | Mobile Application Developer | Cross Platform App Developer | Hybrid App Developer | React Native CLI | React Native Expo | Expo Developer | iOS Developer | Android Developer | iOS App Developer | Android App Developer | Mobile UI Developer | Mobile UI/UX Developer | App Performance Optimization | Mobile App Optimization | App Maintenance | App Bug Fixing | App Deployment | Play Store Deployment | App Store Deployment | Full Stack Developer | Full Stack Mobile Developer | MERN Stack Developer | Frontend Developer | Backend Developer | Node.js Developer | Express.js Developer | NestJS Developer | React.js Developer | Next.js Developer | JavaScript Developer | TypeScript Developer | HTML5 | CSS3 | Tailwind CSS | Bootstrap | REST API Developer | GraphQL Developer | API Integration | Third Party API Integration | Authentication System | JWT Authentication | OAuth Integration | MongoDB | PostgreSQL | MySQL | Firebase | Supabase | SQL Database | NoSQL Database | Database Design | Database Management | AWS | Amazon Web Services | Azure Cloud | Google Cloud Platform | Docker | Kubernetes | CI/CD | CI/CD Pipeline | Git | GitHub | GitLab | Cloud Deployment | AI Mobile App Developer | OpenAI API | ChatGPT Integration | AI Chatbot Developer | Generative AI | AI Automation | AI Integration | Startup MVP Developer | SaaS Application Developer | Scalable App Development | Marketplace App Developer | E-commerce App Developer | Booking App Developer | Delivery App Developer | FinTech App Developer | Healthcare App Developer | EdTech App Developer | Social Networking App Developer | Real Time App Developer | Firebase Realtime Database | 𝐒𝐨𝐜𝐤𝐞𝐭.𝐢𝐨 Developer | Push Notification Integration | Payment Gateway Integration | Stripe Integration | Razorpay Integration | PayPal Integration | Google Maps Integration | GPS Tracking App Developer | Twilio API Integration | WebRTC Developer | Agile Development | Clean Architecture | Redux | Context API | MVVM Architecture | Scalable Mobile Apps | Secure Mobile App Development | AI Powered Mobile Apps | Cloud Based Mobile Apps | React Native Firebase | API Development | App Scaling | Mobile Backend Developer | Responsive Mobile Apps | End-to-End App Development | Startup App Developer | SaaS Developer | MVP App Development | Mobile Product Development | User Authentication | Mobile App Testing | Mobile App Support | Performance Tuning | Real Time Chat App Developer | Notification System Integration | AI Chatbot Integration | OpenAI ChatGPT Apps | Enterprise Mobile Apps | Business App Developer

🏆 𝐑𝐞𝐜𝐨𝐠𝐧𝐢𝐳𝐞𝐝 𝐢𝐧 𝐭𝐡𝐞 𝐓𝐨𝐩 𝟑% 𝐨𝐟 𝐓𝐚𝐥𝐞𝐧𝐭 𝐨𝐧 𝐔𝐩𝐰𝐨𝐫𝐤 𝐟𝐨𝐫 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 | 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 | 𝐅𝐥𝐮𝐭𝐭𝐞𝐫 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 | 𝐅𝐥𝐮𝐭𝐭𝐞𝐫 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 | 𝟏𝟎𝟎% 𝐉𝐨𝐛 𝐒𝐮𝐜𝐜𝐞𝐬𝐬 | 𝟔𝟎+ 𝐏𝐫𝐨𝐣𝐞𝐜𝐭𝐬 𝐃𝐞𝐥𝐢𝐯𝐞𝐫𝐞𝐝 | 7+ 𝐘𝐞𝐚𝐫𝐬 𝐨𝐟 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 | 15𝟎𝟎𝟎+ 𝐇𝐨𝐮𝐫𝐬 𝐁𝐢𝐥𝐥𝐞𝐝 | 𝐀𝐧𝐝𝐫𝐨𝐢𝐝 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 | 𝐈𝐎𝐒 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 | 𝐅𝐥𝐮𝐭𝐭𝐞𝐫 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 | 𝐀𝐈 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 | 𝐀𝐈 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 | 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐦𝐞𝐧𝐭 ✅ Delivered 60+ mobile apps using Flutter, Android & iOS with 5★ client ratings ✅ Integrated AI features (openAI) into live apps ✅ Developed e-commerce, healthcare, fintech, and travel apps for global clients ✅ Published 30+ apps on Google Play Store & Apple App Store with end-to-end deployment support I am a Mobile App Developer expert in Flutter mobile app development with hands-on expertise in Android (Jet pack compose), iOS (Swift), and AI-powered mobile solutions. With a strong background in UI/UX design, API integration, Firebase, REST/GraphQL, and AI model implementation, I create high-performance, scalable, and user-friendly apps that work seamlessly across platforms. I have delivered custom mobile applications in industries such as e-commerce, healthcare, fintech, travel, and education, ensuring top-notch performance and long-term maintainability. 𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐲 𝐒𝐭𝐚𝐜𝐤: ✔️Mobile App Development: Flutter, Dart, Kotlin,SwiftUi ✔️AI: OpenAI API ✔️Backend & API: Node.js, Python (FastAPI, Flask, Django), REST, GraphQL ✔️Databases: Firebase, Firestore, SQLite, MySQL, MongoDB ✔️Cloud Services: Firebase Cloud Functions, AWS, Google Cloud ✔️Version Control & Tools: Git, GitHub, GitLab, Bitbucket, Jira, Trello ✔️UI/UX Tools: Figma, Adobe XD, Material Design, Cupertino Widgets 𝐃𝐨𝐦𝐚𝐢𝐧 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: ◉ Dating App & Matchmaking App ◉ Grocery App ,Ordering Apps & Delivery App ◉ Food Delivery Apps& Restaurant App ◉ On-Demand Technician Service Apps ◉ Taxi & Ride-Hailing Apps ◉ Home Services & On-Demand App ◉ Event Planning & Booking Apps ◉ Restaurant Management Apps ◉ Chat, Messaging & Communication Apps ◉ Social Networking & Community Apps ◉ Health, Fitness & Wellness Apps ◉ Real Estate & Property Apps ◉ Salon Booking App & Beauty Service App ◉ TTS and STT App 🔹 𝐂𝐚𝐩𝐚𝐛𝐢𝐥𝐢𝐭𝐢𝐞𝐬: 𝐂𝐮𝐬𝐭𝐨𝐦 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 – Flutter, Android (Java/Kotlin), iOS (Swift/Objective-C) 𝐂𝐫𝐨𝐬𝐬-𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧𝐬 – High-performance apps for both Android & iOS with single codebase 𝐒𝐨𝐜𝐢𝐚𝐥 𝐌𝐞𝐝𝐢𝐚 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧 – Facebook, Google, Apple, Instagram, YouTube logins & APIs 𝐏𝐚𝐲𝐦𝐞𝐧𝐭 & 𝐒𝐮𝐛𝐬𝐜𝐫𝐢𝐩𝐭𝐢𝐨𝐧 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 – PayPal, Stripe, Razorpay, Google Pay, Apple Pay, In-App Purchases, RevenueCat 𝐂𝐡𝐚𝐭, 𝐌𝐞𝐬𝐬𝐚𝐠𝐢𝐧𝐠 & 𝐂𝐚𝐥𝐥𝐢𝐧𝐠 – Real-time chat, audio/video calls, live streaming with Socket, Firebase, Twilio, Agora 𝐋𝐨𝐜𝐚𝐭𝐢𝐨𝐧-𝐁𝐚𝐬𝐞𝐝 𝐒𝐞𝐫𝐯𝐢𝐜𝐞𝐬 – Google Maps, Places API, real-time tracking, geolocation 𝐀𝐈 & 𝐌𝐚𝐜𝐡𝐢𝐧𝐞 𝐋𝐞𝐚𝐫𝐧𝐢𝐧𝐠 𝐈𝐧𝐭𝐞𝐠𝐫𝐚𝐭𝐢𝐨𝐧 – ChatGPT, OpenAI 𝐁𝐚𝐜𝐤𝐞𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭 & 𝐀𝐏𝐈𝐬 – Node.js, Laravel, PHP, REST/GraphQL APIs 𝐒𝐞𝐜𝐮𝐫𝐢𝐭𝐲 & 𝐀𝐮𝐭𝐡𝐞𝐧𝐭𝐢𝐜𝐚𝐭𝐢𝐨𝐧 Two-Factor Authentication (2FA), OAuth, Twilio, Mailgun 𝐐𝐑 & 𝐁𝐚𝐫𝐜𝐨𝐝𝐞 𝐅𝐞𝐚𝐭𝐮𝐫𝐞𝐬– Custom generation, scanning, payment solutions 𝐀𝐩𝐩 𝐒𝐭𝐨𝐫𝐞 𝐃𝐞𝐩𝐥𝐨𝐲𝐦𝐞𝐧𝐭 – Publishing apps on Google Play Store & Apple App Store with compliance 𝐌𝐚𝐢𝐧𝐭𝐞𝐧𝐚𝐧𝐜𝐞 & 𝐎𝐩𝐭𝐢𝐦𝐢𝐳𝐚𝐭𝐢𝐨𝐧 – Bug fixing, performance tuning, feature upgrades I aim to provide 100% client satisfaction with clean code, fast delivery, and scalable solutions tailored to your business goals. 𝐊𝐞𝐲𝐰𝐨𝐫𝐝𝐬: Flutter developer Flutter app developer Android app developer iOS app developer Cross-platform mobile developer Mobile app development AI mobile app developer Artificial intelligence app development Machine learning app integration Firebase app developer API integration Flutter Hybrid app developer AI solutions for mobile apps AI app developer Mobile App Developer Senior Mobile App Developer Mobile App Development Dating App Flutter Mobile App Development Education App Developer Mobile App Developer Saloon Booking Mobile App Development Dating mobile app development Food Delivery Mobile App Development AI App Development AI Mobile App Developer Chat Mobile App Developer 💬 If you are looking for a reliable Mobile Developer, let’s discuss your mobile app development project and bring your idea to life 🚀.

👋 Hi there ! Looking for an elite Senior Android Developer to architect, secure, and scale powerful Android applications? With 20+ years in native Android development, I've worked across every major SDK, library, and device evolution - delivering fast, secure, and maintainable apps that perform under pressure. I’ve developed and launched 100+ Android apps with over 20 million total downloads and an average Google Play rating of 4.8+. My work has helped reduce crash rates by 70%, shrink APK sizes by up to 60%, and increase app startup speed by 45%. From startups to Fortune 500s, I’ve led 12+ dev teams in delivering mission-critical, high-ROI apps for fintech, defense, media, and beyond. 🏆 Why Work With Me for Android Development? ✔️ 20+ years of deep Android expertise with Java, Kotlin, Jetpack, and NDK ✔️ Delivered 100+ apps to production — 20M+ installs, 4.8+ average rating ✔️ Reduced load times by 45% through advanced performance profiling ✔️ Security-hardened apps using R8, ProGuard, LLVM, NDK, and SELinux policies ✔️ Scaled enterprise-grade apps with 99.99% uptime and real-time data sync ✔️ Played key roles in HIPAA-, FIPS-, and PCI-DSS-compliant mobile solutions 🚀 Core Android Development Services: 📌 Native Android App Development 🔹 Expert in Kotlin, Java, Android SDK, Jetpack Compose, View System 🔹 Responsive UIs across all screen sizes using ConstraintLayout, MotionLayout, Compose 🔹 Modular architecture (MVVM, Clean Architecture, MVI, VIPER) 🔹 Advanced state handling with LiveData, Coroutines, Flow, RxJava 🔹 CameraX, MediaCodec, ExoPlayer for media-heavy apps 🔹 Full device compatibility from Android 5.0+ through latest Android 14 📌 Android Security & Low-Level Optimization 🔹 Obfuscation, code hardening, and NDK-level protection 🔹 Reverse engineering mitigation via Frida/Root detection 🔹 Low-level optimization with ARM NEON, RenderScript, JNI, and custom kernels 🔹 SELinux customization for hardened AOSP builds 🔹 Hardware integration with sensors, gyroscopes, accelerometers, and BLE 📌 Multimedia, Games & Streaming 🔹 Real-time video/audio with FFmpeg, OpenGL, Vulkan, MediaCodec 🔹 Game engines: Unity3D, LibGDX, custom OpenGL renderers 🔹 Augmented Reality with ARCore, face tracking, 3D overlays 🔹 Advanced drawing tools, canvas-based animation, real-time filters 📌 Backend Integration & Architecture 🔹 REST, GraphQL, gRPC, WebSockets, Firebase, and custom socket protocols 🔹 Secure data sync, push notifications (FCM), and analytics (Firebase, Amplitude) 🔹 CI/CD pipelines using Jenkins, Bitrise, GitHub Actions, and custom Gradle workflows 🔹 Offline sync and caching strategies for resilient performance 📌 Scalable Architecture & Cross-Platform 🔹 Kotlin Multiplatform, Clean Architecture, modularized multi-feature apps 🔹 Deep understanding of Android App Bundles, Play Feature Delivery, and Instant Apps 🔹 Flutter experience for select cross-platform needs (Dart/Flutter SDK) 📌 Database & Networking 🔹 SQLite, Room, Realm, SQLDelight, Firebase Realtime/Firestore 🔹 JSON parsing with Gson, Moshi, org.json 🔹 API integration using Retrofit, OkHttp, Apollo Client 🌟 Results-Driven Impact ✅ 70% reduction in crash rates using advanced testing and monitoring ✅ 45% increase in startup speed through bytecode and resource optimization ✅ 60% smaller APK sizes using modularization and build optimization ✅ 50% faster delivery cycles using custom CI/CD pipelines ✅ 40–65% increase in user retention through performance and UX refinement ✅ 99.99% stability in live apps with over 1M monthly active users 💡 Focused On What Matters Most: ✔️ Clean, scalable, testable code that teams can maintain and extend ✔️ Proactive debugging and crash prevention strategies ✔️ User-first experiences built for performance and engagement ✔️ Modern, maintainable app structure that grows with your business ✔️ Full lifecycle support-from idea to Play Store launch and beyond 🚀 Ready to Build a High-Performance Android App? Let’s talk! Whether you're starting from scratch, rebuilding a legacy app, or scaling for millions-I'll help you build it right, fast, and with precision.

I help startups and businesses design, build, and launch high-performance mobile apps for iOS and Android. With 12+ years of experience and 100+ apps shipped worldwide, I build production-ready mobile products using Swift, Kotlin, Flutter, and React Native, with back-end support, clean architecture, and AI-powered features when needed. I can help with: - Native iOS and Android development - Cross-platform apps in Flutter and React Native - AI features like chat-bots, recommendations, personalization, and analytics - Back-end APIs, dashboards, authentication, payments, and real-time features - App Store and Google Play deployment Clients choose me for clear communication, reliable delivery, and scalable code that is built for long-term growth. If you need an app developer who can take your product from idea to launch and beyond, send me a message.

Need a mobile app built that holds up after launch? I lead mobile app development that ships production-ready iOS and Android apps that survive real users - several are live on the App Store and Google Play right now. I'm Oleksandr, founder and lead engineer at Kultrix, an AI and Mobile App Studio, working from Lviv. Most of our work is React Native mobile app development, plus the AI features and backend that make an app actually useful. I run engagements as a long-term technical partner, not a vendor you chase for updates - which is why several engagements have run 16 months to 4+ years. You get senior engineering ownership from first call to store release: clear scope, milestone-based delivery, honest timelines, and a lead who is accountable for the result. As founder and lead engineer, I make sure the mobile app development gets done right, not just fast. WHAT WE BUILD - Full mobile app development in React Native and Expo, from idea to store release - a cross-platform iOS and Android app from one codebase, typically a launched MVP in 6-10 weeks. With a senior React Native developer leading, we cover MVP development, App Store and Google Play submission, and everything in between. - AI integration inside mobile apps - chat, image and vision analysis, and conversational voice (OpenAI and Anthropic Claude), already shipped in live AI mobile apps. Clean API integration so the AI feature feels native, not bolted on. - Rescue and refactor of React Native apps that broke under real users - performance, crashes, and stability work to get an existing app back to store-ready. - Backend when your app needs more than screens: Node.js, NestJS, Python and FastAPI, PostgreSQL, MongoDB, Firebase, and Supabase (including auth and RLS). WHO IT IS FOR - Starting from scratch: a clear path from idea to a launched MVP in 6-10 weeks, built by a team that has shipped to both stores. - Already have an app: mobile app development help with new features, performance, and stability - whether you need an iOS developer, an Android developer, or both. - Want to add AI: a chat, vision, or voice feature shipped into your live cross-platform app through careful AI integration, scoped so it ships fast and stays maintainable. HOW WE WORK You talk to the people building your app, not a sales layer. We agree on scope and milestones up front, you see working builds early and often on TestFlight and internal tracks, and you get honest status instead of silence. When something is harder than estimated, you hear it early - with options, not surprises. The goal is a stable app you can grow on, and a codebase your next mobile app developer can read without a rewrite. VERTICALS WE KNOW We have shipped mobile app development work across health and wellness, nutrition, and fitness (calorie tracking, meal analysis, AI coaching), fintech and Web3 (payments, Plaid, Polygon on-chain apps), SaaS (Stripe billing and dashboards), and internal tools and logistics (warehouse and operations systems). If your app lives in one of these spaces, we have built and launched something close to it. RESULTS - An AI nutrition tracker - React Native meal and calorie analysis with Anthropic Claude and OpenAI - live on both the App Store and Google Play, owned end to end (mobile, API, and admin). - An AI fitness app on a Python and FastAPI backend with OpenAI, live on the App Store and Google Play. - A conversational-voice health app built with React Native, Expo, and Claude. - A Web3 scratch-card app on Polygon with Plaid integration, live on Google Play, plus a daily-quotes app on the App Store. - A warehouse operations system that runs 4x faster for 100+ employees. - Long-term mobile app development engagements kept for 16+ months and 4+ years - the clearest signal that this work lasts. OUR STACK React Native, Expo, TypeScript for cross-platform iOS and Android; Node.js, NestJS, Python and FastAPI, PostgreSQL, MongoDB, Firebase, and Supabase on the backend; Stripe, in-app purchases, push notifications, and WebSockets for real product features; and AI APIs (OpenAI and Anthropic Claude) for chat, vision, and voice. This is the full toolkit for modern mobile app development and AI integration, from first commit to a stable app on the App Store and Google Play. Send me your idea or your existing app and you will get back a clear, honest breakdown - what to build first, what can wait, and a realistic timeline for the mobile app development. No pressure, no jargon, just a straight answer from the lead who would own the work. Oleksandr - founder and lead engineer, Kultrix (AI and Mobile App Studio).

I’m a Top-Rated Senior Full Stack Developer with 13+ years of experience building scalable web and mobile applications for startups, agencies, and enterprise clients. I specialize in delivering high-performance, user-focused solutions across both front-end and back-end development, with a strong focus on clean architecture, scalability, and long-term maintainability. ✅ Top Rated Plus – Expert-Vetted Top 1%
 ✅ 13+ Years of Professional Experience
 ✅ Full Stack Web & Mobile Application Development
 ✅ Strong Experience with Startups, SaaS Platforms & Enterprise Solutions Technical Expertise: Mobile:
Flutter, React Native, Swift, Java CMS & E-Commerce:
WordPress, Shopify, WooCommerce, HubSpot, Drupal Frontend:
React, Angular, Vue.js, Next.js, HTML5, CSS3, Tailwind CSS, Bootstrap Backend:
Node.js, Express.js, Django, Python, Laravel, .NET Databases:
PostgreSQL, MySQL, MongoDB, Firebase DevOps & Cloud:
Git, Docker, CI/CD, AWS, Azure, Nginx I have extensive experience leading projects from concept to deployment, building robust APIs, custom platforms, mobile applications, and scalable cloud-based systems while ensuring high code quality and seamless user experiences.

Upwork certified Mobile App Developer, Senior Mobile App Developer, React Native, DevOps, React Developer, IOS mobile app Developer, Android mobile app Developer, Node.JS, TypeScript, Hybrid App Development, AI Mobile App Development, Web Development with experience in mobile app development for 10 years. I turn your bold ideas into reality✨ My responsibilities: ✅ Strong JavaScript development skills (TypeScript, ES6), React.js, React Native ✅ Strong experience with Node.js ✅ Expertise in MongoDB / NoSQL databases ✅ Strong object-oriented programming and design skills ✅ Experience with RESTful web services ✅Ability to solve problems independently ✅ Outstanding teamwork and communication skills ✅ Understanding of modern Mobile technologies ✅ Ability to quickly learn new technologies Skills & Expertise: ✅ TypeScript ✅ Node JS (Express / Nest) ✅ MongoDB / MySQL / Firebase ✅ Third-Party API integrations Be sure, I'll provide you with: ✅ Clean, bug-free and highly structured source code, check please my GitHub ✅ Regular report of project status with relevant deliverable Looks like I'm a superman? I'll let you in my secret: I am a part of Kit Global team, actually, I am CEO of mobile development company, and in the past a very strong back-end dev. We want your story to be a successful one, so we develop solutions that help our clients' businesses to grow. With exposure to multiple industry verticals, we enjoy working on innovative challenges and amend our working process to cater to your expectations. However, we only accept projects that we can handle and never waste time for trial and error process development. I have a strong grip over developing these below-listed domain's app: ✅ E-Commerce Apps ✅ Social Networking Apps ✅ Taxi Apps ✅ Chat & Dating Apps ✅ E- Learning App ✅ Health & Fitness Apps ✅ Food Delivery Apps ✅ Photo Editing & Sharing Apps ✅ Travel Apps ✅ Music & Video Player Apps ✅Telemedicine As a bonus, I offer you: ✅Q/A testing, application deployment ✅Free consulting and support I believe that communication is the key to a successful project, so please let me know a time to discuss that works best for you!

I help startups, SaaS companies, and growing businesses build scalable mobile and web applications using Flutter, React Native, React.js, Next.js, Node.js, Firebase, and AWS. With 10+ years of experience in full-stack and mobile app development, I’ve worked on startup MVPs, SaaS platforms, fintech systems, AI-powered applications, real-time platforms, and custom business solutions used by real users and growing companies. My expertise covers the complete product development lifecycle — from UI implementation and mobile app development to backend systems, APIs, cloud infrastructure, and production deployment. 𝐏𝐫𝐢𝐦𝐚𝐫𝐲 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 • Cross-Platform Mobile App Development (Flutter & React Native) • Full-Stack Web Development (React.js, Next.js & Node.js) • SaaS Product Development & Startup MVPs • AI-powered Application Integrations • Real-Time Chat, Notifications & Live Systems • Payment Gateway & Third-Party API Integrations • Firebase, AWS & Cloud-based architectures • Scalable Backend systems with Node.js 𝐖𝐡𝐚𝐭 𝐈 𝐂𝐚𝐧 𝐇𝐞𝐥𝐩 𝐘𝐨𝐮 𝐁𝐮𝐢𝐥𝐝 • Android & iOS Mobile Applications • Startup MVPs & SaaS Platforms • AI-powered Mobile & Web Applications • Ecommerce, Booking & Fintech Platforms • Business Automation Systems • Real-Time Applications & Dashboards • Cloud-based Scalable Applications • API-based Mobile & Web Solutions 𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐖𝐨𝐫𝐤 𝐖𝐢𝐭𝐡 𝐌𝐞 • Clean, scalable, and maintainable architecture • High-performance mobile and web applications • Strong communication and transparent workflow • Business-focused product development approach • Fast and reliable delivery • Long-term scalability and performance optimization • Experience building real-world startup products 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤 Flutter • React Native • React.js • Next.js • Node.js • Firebase • AWS • MongoDB • PostgreSQL • REST APIs • AI Integrations I focus on building applications that are stable, scalable, user-friendly, and ready for real business growth. Whether you need a startup MVP, SaaS platform, scalable mobile application, or full-stack business solution, I can help turn your idea into a reliable and production-ready product.