Ranjeet Singh S.

AI Mobile App Developer | React Native, Flutter, iOS & Android

I build production-ready mobile applications for iOS and Android using React Native, Flutter, Swift, SwiftUI and Kotlin — and integrate AI, LLMs, AI agents, automation and intelligent workflows into real-world mobile products. With 186+ completed jobs, 14K+ hours, Top rated status and a 95% Job Success Score, I help startups, businesses and product teams build new mobile products, modernise existing applications, add AI capabilities, and take products from idea or prototype through production launch. I can work across the complete product stack — mobile application, backend APIs, databases, AI integrations, third-party services, testing and App Store / Google Play deployment. WHAT I CAN BUILD FOR YOU Mobile App Development • React Native + TypeScript applications for iOS and Android • Flutter + Dart applications for iOS and Android • Native iOS development with Swift and SwiftUI • Native Android development with Kotlin • New mobile apps and MVPs from scratch • Existing app development, modernisation and feature enhancement • Production codebase audit, debugging and stabilisation • API and third-party SDK integrations • Pixel-perfect implementation from Figma designs • Mobile performance optimisation • App Store and Google Play deployment • Bug fixing, maintenance and long-term development AI-POWERED MOBILE APPLICATIONS I build AI features that are integrated into the actual product experience rather than simply adding an AI API. • OpenAI, Claude, Gemini and other LLM integrations • AI chatbots and conversational assistants • AI agents and intelligent workflows • Tool/function calling and API-connected AI • Context-aware AI experiences and conversation history • Streaming AI responses • RAG-based applications and knowledge assistants • AI-powered search • Personalised recommendations and content generation • Predictive analytics and intelligent decision support • Computer vision and image recognition • OCR and intelligent document/image processing • Voice AI, speech-to-text and AI voice experiences • AI-powered automation • AI features connected to existing business systems and APIs I can also work with AI-assisted development workflows using tools such as Claude, GitHub Copilot, Cursor and ChatGPT while maintaining proper engineering, testing and code-review standards. REACT NATIVE & CROSS-PLATFORM For React Native projects, I work with modern production architectures using: • React Native • TypeScript • Expo / Expo Router where appropriate • REST and GraphQL APIs • Redux Toolkit, Zustand and other state-management approaches • Firebase and Supabase • WebSockets and real-time functionality • Push notifications and deep linking • Authentication and secure token management • In-app purchases and subscriptions • RevenueCat • Analytics, crash reporting and monitoring • App Store Connect and Google Play Console MOBILE FEATURES & INTEGRATIONS I have experience building mobile applications with: • Payments, subscriptions and digital wallets • Stripe, PayPal, Braintree, Razorpay and payment SDKs • Apple In-App Purchases and Google Play Billing • RevenueCat • Push notifications, APNs and FCM • Maps, GPS, location and geofencing • Camera and image processing • OCR and QR/barcode scanning • Computer vision • BLE, iBeacon and IoT integrations • Audio, video and real-time communication • WebSockets and real-time synchronisation • User authentication and account management • Firebase and Supabase • REST APIs and GraphQL • Third-party APIs and SDKs • Analytics, crash reporting and performance monitoring BACKEND, APIs & CLOUD I can also handle the backend and integration layer required by the mobile application: • Node.js and NestJS • Python, Django, Django REST Framework and FastAPI • PostgreSQL, MySQL and MongoDB • Redis • Firebase / Firestore • Supabase • REST APIs and GraphQL • AWS, Azure and Google Cloud • Docker • Authentication, authorisation and secure API design This allows me to work across the complete application flow — from mobile UI and user experience to APIs, databases, AI services, third-party integrations and cloud deployment. EXISTING APP DEVELOPMENT & STABILISATION Already have an application? I can work with an existing codebase to: • Diagnose and fix difficult bugs • Identify root causes instead of applying temporary patches • Improve application stability and performance • Add new features without disrupting existing functionality • Modernise outdated code • Integrate AI into an existing application • Fix API, authentication and third-party integration issues • Resolve App Store / Google Play deployment issues • Improve production readiness and release quality I am comfortable taking ownership of an existing product and working within an established architecture and codebase. TYPES OF APPLICATIONS • AI and LLM Applications • AI Assistants and Conversational Apps • SaaS and Business Applications • FinTech and Payments • Sports