I’m a mobile developer with 10+ years of experience, delivering iOS and Android apps for startups and growing businesses. I take full ownership of your mobile product — from UI implementation and backend integration to app release — ensuring stable, scalable, and maintainable applications. Core Expertise: • Native Mobile App Development (iOS & Android) • Cross-Platform Development (Flutter, React Native) • MVP Development for Startups • UI/UX Implementation from Figma • Backend & API Integration (Firebase, REST APIs, WebSockets) • Payment Integration (Stripe, Apple Pay, Google Pay, Checkout) • Push Notifications & Real-Time Features • Location-Based Features (GPS, geofencing, check-ins) • Secure Authentication & User Account Systems • Admin Dashboards & Content Management Tools Mobile App Capabilities: Authentication & User Profiles: • Email/password login, social login, phone verification • Onboarding flows & profile setup UI/UX Development: • Pixel-perfect Figma to app implementation • Clean, modern layouts with transitions and animations • Light & dark mode support Real-Time Features: • WebSockets & real-time data synchronization • Live activity feeds, group updates, notifications • Video streaming with low-latency support Payments & Monetization: • Stripe, Checkout, Apple Pay & Google Pay • Escrow systems • Loyalty & reward programs Location-Based Features: • GPS tracking, geofencing, check-ins • Partner & location listings API & Backend Integration: • Firebase, Supabase • Custom backends with Node.js or Python/FastAPI • Third-party API integration Admin Panels & Dashboards: • Content & menu management • Promotions, analytics & reporting Industries: • Fintech & money transfer • Food ordering & loyalty apps • EdTech & gamified learning • Marketplaces & peer-to-peer resale • Social & community apps • Video security & AI analytics • Health, wellness & fitness apps • Productivity & task management tools Work Approach: • Clear and consistent communication • Milestone-based process • Predictable delivery timelines • End-to-end ownership of mobile development • Long-term maintenance & feature expansion available 💬 Let’s discuss your project — I can deliver a reliable, scalable, cross-platform mobile app from idea to MVP or full product, on time and with high technical quality. Keywords: Flutter Developer, Cross-Platform App, Mobile App, iOS, Android, MVP, SaaS, Figma, Firebase, Supabase, Payment Integration, Real-Time Features, GPS, Admin Dashboard

Hi, My name is Payal, a Full-stack developer with over 2900+ Upwork hours and $70K+ earned helping clients build smart, scalable, modern web and mobile apps for startups, SMEs, and enterprises. I work across the entire development cycle, from frontend design to backend architecture, and I help clients launch scalable products that are clean, secure, and performance-optimized I have built SaaS platforms, custom eCommerce solutions, ERP, MVPs, Admin panels, and APIs all with a focus on usability, speed, and growth. My Skills Include: - Frontend: React.js, Vue.js, Angular, Next.js, Tailwind CSS, TypeScript - Mobile: React Native, Flutter - Backend: Node.js, Laravel, PostgreSQL, MongoDB, MySQL - DevOps: Docker, Firebase, Supabase, AWS, CI/CD - Tools: Figma, Webflow, Airtable, Notion, Make I Can Help You With: - Full-featured SaaS products - Cross-platform mobile apps - MVPs with fast turnaround - Custom ERP & business tools - Admin Dashboards and analytics - API development and integrations I follow agile practices, i write clean code, and stay transparent throughout the project to deliver on time and within scope. Whether you're starting from scratch or scaling an existing system, I’ll help you build something reliable and ready for growth. Let’s work together to turn your vision into a solid, high-performing product.

Hi, I am the Founder and CEO of a Mobile App Design and Development Agency named App-Knit. We specialise in providing trustworthy and reliable service for your mobile app needs. We have worked on more than 200 Android, iOS, and WEB app projects in the last 6 years. The mobile apps that I have delivered have an average customer rating of 4.5 and above (on a scale of 5). Hence, User Experience (UX) and design are at the heart of all the work we do. Our clients love me for always asking questions to fully understand their mobile app needs, ensuring that we create better apps. Quality is my top priority, and so is keeping deadlines. I am always honest, so don't expect me to lie to you or to your customers. I believe successful collaboration depends on truth and effective communication. I don’t offer one-size-fits-all solutions. Once you contact me, based on the details you’ve provided, I’ll get back to you with some questions or a price quote. Get in touch today to discuss how I can help you!

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).

A mobile app developer with 10+ years of experience in building native iOS and Android applications and cross-platform mobile apps with React Native and Flutter. I help startups, founders, and businesses turn ideas into high-quality mobile products that are fast, reliable, and built for real-world use. My work covers everything from MVP development and rapid prototyping to full-featured applications with scalable architecture and long-term growth in mind. With strong knowledge of the complete mobile app development lifecycle, I manage projects from idea validation and UI/UX planning to development, testing, deployment, and post-launch support. ❯❯❯❯ Mobile App Development Solutions I Offer ❮❮❮❮ ◆ Native app development for iOS and Android ◆ Cross-platform app development with React Native and Flutter ◆ MVP development for startups and new product ideas ◆ UI/UX design with clean, modern, user-focused interfaces ◆ Backend development and third-party API integration ◆ AI-powered mobile features such as chat, voice, automation, and recommendations ◆ Real-time chat, notifications, and live data sync ◆ Authentication, payments, subscriptions, and secure data handling ◆ Location-based functionality, maps, and GPS tracking ◆ Testing, debugging, optimization, and performance improvements ◆ App Store and Google Play deployment ◆ Ongoing support, updates, and maintenance ❯❯❯❯ Examples of Mobile Solutions Delivered ❮❮❮❮ ◆ On-demand booking and service apps ◆ AI fitness and health tracking apps ◆ E-commerce mobile apps ◆ Real estate property platforms ◆ Social networking and chat apps ◆ Logistics and delivery tracking apps ◆ EdTech and learning apps ◆ AI chatbot and assistant apps ❯❯❯❯ Core Technologies & Tech Stack ❮❮❮❮ ◆ Mobile ➜ Swift, SwiftUI, Kotlin, Jetpack Compose, Flutter, React Native ◆ Frontend ➜ TypeScript, JavaScript ◆ Backend ➜ Node.js, Express.js, Firebase, Supabase ◆ Database ➜ PostgreSQL, MongoDB, AWS ◆ AI ➜ OpenAI, LangChain, LlamaIndex, Google ML Kit, TensorFlow Lite ◆ Tools ➜ Xcode, Android Studio, Cursor, GitHub Copilot, Replit, Expo, FlutterFlow ◆ Testing & CI/CD ➜ Jest, Detox, XCTest, Fastlane, GitHub Actions, Sentry ◆ Design ➜ Figma, Material 3, Apple HIG If you have a mobile app idea or need to improve an existing product, feel free to reach out. Happy to discuss your requirements and suggest the best approach to build a reliable, high-quality solution.

My Flutter apps have run inside 𝐂𝐢𝐭𝐢𝐛𝐚𝐧𝐤. My React Native builds earned an 𝐞𝐝𝐢𝐭𝐨𝐫𝐢𝐚𝐥 𝐟𝐞𝐚𝐭𝐮𝐫𝐞 𝐢𝐧 𝐆𝐮𝐚𝐫𝐝𝐢𝐚𝐧 𝐔𝐊, the UK's number one newspaper I am a Senior Mobile app developer specializing in Flutter and React Native for iOS and Android. MVP builds and enterprise-scale apps that ship fast and do not get rebuilt. . ▸200+ projects. ▸1,000,000+ users across live products. ▸10+ years building production mobile apps. Most mobile apps never reach 1,000 users, not because the idea failed, but because the development did. Wrong architecture. Missed deadlines. Apps rebuilt six months after launch. If you are looking to hire a mobile app developer who builds it right the first time, read on. "𝑮𝒓𝒆𝒂𝒕 𝒄𝒐𝒎𝒎𝒖𝒏𝒊𝒄𝒂𝒕𝒊𝒐𝒏 𝒔𝒌𝒊𝒍𝒍𝒔, 𝒑𝒓𝒐𝒇𝒆𝒔𝒔𝒊𝒐𝒏𝒂𝒍 𝒑𝒆𝒓𝒇𝒐𝒓𝒎𝒂𝒏𝒄𝒆. 𝑫𝒆𝒑𝒍𝒐𝒚𝒆𝒅 𝒐𝒖𝒓 𝒎𝒐𝒃𝒊𝒍𝒆 𝒂𝒑𝒑 𝒕𝒐 𝒐𝒗𝒆𝒓 100𝒌 𝒖𝒔𝒆𝒓𝒔 𝒘𝒊𝒕𝒉𝒐𝒖𝒕 𝒊𝒔𝒔𝒖𝒆𝒔. 𝑨𝒍𝒓𝒆𝒂𝒅𝒚 𝒓𝒆𝒄𝒐𝒎𝒎𝒆𝒏𝒅𝒆𝒅 𝒉𝒊𝒎 𝒕𝒐 𝒐𝒕𝒉𝒆𝒓 𝒄𝒐𝒎𝒑𝒂𝒏𝒊𝒆𝒔." 5 Stars Enterprise client, Upwork ⚡ I am a great fit you are are thinking: ▸ "My last developer disappeared halfway through and I need someone who actually finishes" ▸ "I need a Flutter or React Native developer who takes full ownership, not just the frontend" ▸ "I want an AI-powered mobile app but don't know where to start" ▸ "I need a production-ready MVP in weeks, not months" ▸ "I want clean architecture that won't need a full rebuild six months after launch" ▸ "I need someone who communicates clearly and doesn't go silent mid-project" 𝐖𝐡𝐚𝐭 𝐈 𝐁𝐮𝐢𝐥𝐝 ▸For Funded Startups - MVP Mobile App Development Your investors need a working product, not a Figma file. I build Flutter and React Native MVPs scoped to launch in weeks, architected to survive real users and scale after your next funding round. ▸For Enterprise Teams - Enterprise Mobile App Development When Citibank needed enterprise mobile infrastructure, execution mattered more than promises. I build enterprise iOS and Android apps with clean architecture, full documentation, and zero technical debt. 𝐖𝐡𝐚𝐭 𝐘𝐨𝐮 𝐆𝐞𝐭 ▸Cross-Platform Development (Flutter and React Native): One codebase, native-grade performance on iOS and Android. Faster to market, built to scale. ▸Native iOS and Android Development: Swift, SwiftUI, Kotlin, Jetpack Compose when platform-specific performance demands it. ▸AI-Powered Mobile Apps: OpenAI API, GPT-4, recommendation engines, and AI personalization built into your app's core. ▸Full-Stack Delivery: UI/UX design to Flutter or React Native frontend to Node.js backend to App Store and Play Store deployment. 𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐲 𝐒𝐭𝐚𝐜𝐤 Mobile: Flutter, Dart, React Native, Swift, Kotlin, SwiftUI, Jetpack Compose Backend: Node.js, Python, FastAPI, REST, GraphQL Database: Firebase, Firestore, PostgreSQL, MySQL, MongoDB Payments: Stripe, PayPal, RevenueCat, Apple Pay, Google Pay Real-Time: Twilio, Agora, Socket io Cloud: AWS, Google Cloud, Firebase Cloud Functions Design: Figma, Adobe XD, Material Design 𝐈𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐞𝐬 FinTech and Banking, Healthcare, Fitness, Food Delivery, Ride-Hailing, Real Estate, E-Commerce, Dating, EdTech, Social Networking, On-Demand Services, AI SaaS, Luxury Travel, Salon and Beauty 𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐂𝐡𝐨𝐨𝐬𝐞 𝐌𝐞 ▸Top Rated Plus, Top 3% on Upwork ▸700+ projects, 1,000,000+ users, 10M+ dollars earned ▸Enterprise clients include Citibank USA and Jet VIP ▸Guardian UK editorial feature, earned not paid ▸10+ years in Flutter, React Native, Swift, Kotlin ▸400+ apps live on App Store and Play Store ▸I respond within 2 hours. Always. 𝐇𝐨𝐰 𝐄𝐯𝐞𝐫𝐲 𝐏𝐫𝐨𝐣𝐞𝐜𝐭 𝐖𝐨𝐫𝐤𝐬 UI/UX Design to Flutter or React Native Frontend to Node.js Backend to QA and Testing to iOS and Android Deployment to 8 Weeks Free Post-Launch Support No black-box development. No scope surprises. Weekly progress updates throughout. 𝐆𝐞𝐭 𝐚 𝐅𝐫𝐞𝐞 𝐀𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞 𝐑𝐞𝐯𝐢𝐞𝐰 Send me your app idea and I will give you a free 30-minute architecture review. Right scope, right stack, right timeline. No pitch. No commitment. If I cannot help you, I will say so in the first 10 minutes. Message me now with your project brief. I respond within 24 hours. 𝐊𝐞𝐲𝐰𝐨𝐫𝐝𝐬 Mobile App Development, Mobile App Developer, Flutter Developer, React Native Developer, iOS App Development, Android App Development, Cross-Platform App Development, AI Mobile App Developer, AI App Development, Full Stack Mobile Developer, Flutter App Developer, Firebase Developer, Supabase Developer, MVP Development, Custom Mobile App Development, AI-Powered App Development, OpenAI API Mobile App, ChatGPT Mobile Integration, App Store Deployment, Play Store Deployment, Mobile App Development for Startups, Mobile App Development for Enterprise, Fintech App Development, Healthcare App Development, Fitness App Development, Food Delivery App Development, Dating App Development, E-commerce Mobile App, SaaS Mob

I help startups and businesses build and launch Flutter apps for iOS and Android fast, with clean architecture and production-ready delivery. If you need an MVP, booking app, marketplace app, delivery app, or AI-enabled mobile product, I can take it from planning to App Store and Google Play launch. My work typically includes: • Flutter app development for iOS and Android • Firebase backend setup • REST API integration • Push notifications • Payments and subscriptions • Google Maps and location features • Admin panel and backend integration • App performance optimization • App Store / Play Store publishing support Public Upwork proof: • 100% Job Success • 30 completed jobs • live shipped products and verified client testimonials I’m a strong fit if you want: • fast MVP execution without messy code • clear communication and realistic timelines • a developer who can build, fix, optimize, and publish • long-term support after launch Recent product work includes travel apps, AI habit products, ride-hailing, radio streaming, fintech, and service platforms. If you already have scope, features, or designs ready, send them over and I’ll suggest the best build approach.

I help startups and enterprises reduce development time by 40% and increase user engagement by 30-50% through high-performance mobile solutions. With 9+ years of experience and over 100+ apps delivered, I specialize in transforming complex business requirements into clean, scalable, and market-ready applications. Why Clients Partner With Me: • Proven Results: I have maintained a 95% client retention rate by consistently delivering work that drives business growth and improves app store visibility. • AI-First Development: I integrate cutting-edge Generative AI (ChatGPT, Claude) to build intelligent features—including chatbots and recommendation engines—that set your product apart. • Full-Stack Expertise: From native iOS (SwiftUI) and Android (Kotlin) to efficient cross-platform frameworks (Flutter, React Native), I ensure your app performs flawlessly across all devices. • Scalable Architecture: I specialize in building robust backend integrations with Firebase and AWS to ensure your app can handle growth from day one. Core Areas of Expertise: • Mobile Excellence: High-performance native & cross-platform app development. • AI/ML Integration: Building smart, data-driven app features. • UI/UX Design: User-centric prototyping using Figma and Sketch. • App Performance: ASO strategies to boost visibility and optimize load times. I don’t just write code; I build mobile solutions that perform. Let’s discuss how we can bring your project to the next level.

📍 React Native development for production mobile apps 📍 Full stack engineering for complex backend systems 📍 AI Agent Development for automation and intelligent workflows For more than 11 years, I’ve been working in mobile app development and full stack development, delivering scalable web platforms, high-performance mobile apps, and modern AI-driven systems. This combination allows me to build products end-to-end, from mobile UI to backend architecture and AI logic. 📱 Mobile App Development & React Native Expertise As a React Native developer, I’ve built and scaled mobile applications used in fintech, real estate, healthcare, marketplaces, and social platforms. My mobile app development experience includes: - Cross-platform iOS and Android apps - Complex user roles and permissions - Real-time features (chat, live updates, tracking) - High-load backend integrations - Clean architecture designed for long-term growth One of my key projects Breeze, a real estate mobile platform was developed end-to-end as a full stack developer and later raised $3M+ in investments. That experience strongly shaped how I approach architecture, scalability, and product quality. 🤖 AI Agent Development & Automation In parallel with product engineering, I focus heavily on AI Agent Development. As an AI Agent Developer and AI Automation Expert, I design systems that go far beyond simple chatbots. I build: - AI agents with planner-executor architecture - Multi-agent systems with task orchestration - AI chatbots connected to business data - AI automation pipelines for operations, research, and analytics - RAG systems using embeddings and vector databases These AI agents are designed to interact with real systems, APIs, CRMs, databases, internal tools, and operate as part of a real product ecosystem. My goal is always the same: turn AI from an experiment into a reliable, controllable product component. 🔗 Where AI meets Full Stack Development What makes my approach different is the combination of: AI Developer + Full Stack Developer + Mobile App Developer This means: - AI agents integrated into web platforms - Mobile apps powered by AI logic - Backend services managing agent execution - Dashboards for monitoring and control - Secure and scalable infrastructure Instead of isolated AI tools, clients get complete AI-powered products. 💡Clients usually come to me when they need: - A senior engineer who understands product logic - A CTO-level partner, not just a coder - Clean architecture from day one - Systems prepared for growth, investment, and scale That’s why many clients stay long-term and treat me as a technical partner, not a temporary freelancer.

SaaS developer & React Native specialist. I build full-stack SaaS platforms and mobile apps for startup founders — from MVP to App Store launch. 146+ projects shipped. 100% Job Success Score. Top Rated Plus. I partner with early-stage founders and growing SaaS companies to design, build, and launch products that work in production — not just in demos. My core stack is React Native, Flutter, Next.js, Node.js, and Supabase, with AI integration (OpenAI, GPT-4, Claude API, LangChain) built in where it creates measurable value. What I build: — Full-stack SaaS platforms with auth, billing, dashboards, and multi-tenant architecture — React Native and Flutter mobile apps for iOS and Android — AI-powered features and agents using OpenAI, GPT-4, Claude API, and LangChain — Supabase and Firebase backends built to scale — MVPs taken from idea validation to App Store and Google Play launch What I bring: — $300K+ in completed Upwork contracts as a Top Rated Plus freelancer — 146+ projects shipped across SaaS, Finance, Healthcare, EdTech, Marketplaces, and AI — 100% Job Success Score across 8+ years of client work — Products used by thousands of users in production worldwide I write clean, well-documented code your next developer can open and build on immediately. I communicate daily, flag risks early, and stay fully invested from kickoff through launch. Stack: React Native · Flutter · Expo · Next.js · Node.js · TypeScript · Supabase · Firebase · PostgreSQL · OpenAI API · Claude API · GPT-4 · GraphQL · REST APIs · AWS · Vercel · GitHub Actions If you're building a SaaS platform, mobile app, startup MVP, or AI-powered product — send me a message and I'll tell you exactly how I'd approach it.