deep j.

Hi, I’m Jag Deep, a Senior Mobile App Developer and AI Product Engineer with 8+ years of experience building production-ready mobile and full-stack applications. ✓ TOP-RATED PLUS & TOP 3% OF FULL STACK DEVELOPERS ON UPWORK ✓ 80+ LIVE APPLICATIONS ACROSS iOS, ANDROID & WEB ✓ PRODUCTS SERVING 100K+ USERS ✓ $10M+ RAISED BY COMPANIES BEHIND MVPs I’VE HELPED DELIVER 📱 MOBILE APP DEVELOPMENT I build, fix, modernize, and ship mobile applications across Flutter, React Native, iOS, and Android. My work covers the full product lifecycle, from MVP development and Figma-to-app implementation to backend integration, authentication, payments, real-time features, testing, performance optimization, and App Store / Google Play deployment. I’ve worked on products across healthcare, fitness, wellness, education, real estate, booking, delivery, social networking, marketplaces, eCommerce, GPS/location-based applications, and enterprise software. ⚡ EXISTING APP DEVELOPMENT & MODERNIZATION A large part of my work involves taking an existing product and moving it forward. I can step into an unfinished, buggy, AI-generated, or legacy application to: ✓ Audit and understand the existing codebase ✓ Fix bugs and production issues ✓ Refactor and clean up code ✓ Improve application performance ✓ Add new features and integrations ✓ Connect mobile apps with APIs and backend systems ✓ Fix authentication, payment and data workflows ✓ Prepare applications for production ✓ Submit and launch on the App Store and Google Play This includes applications built by previous developers as well as products created with AI-assisted development platforms such as Lovable, Replit and similar tools. 🤖 AI APP DEVELOPMENT I also build AI-powered mobile and full-stack applications where AI is part of the actual product experience, not simply added as a chatbot. My AI work includes: • AI Mobile App Development • OpenAI API Integration • LLM Integration • AI Assistants & Conversational Interfaces • AI-powered Recommendations • AI-generated Content • AI Coaching & Personalized Experiences • AI Automation & Product Workflows • RAG-based Applications • AI-assisted Application Development For AI products, I can handle both the application layer and the engineering around it, including APIs, authentication, databases, backend workflows and production deployment. ☁️ FULL-STACK & BACKEND DEVELOPMENT When a mobile product needs more than the frontend, I work across the application stack using: • Node.js • React • TypeScript / JavaScript • Firebase • Supabase • PostgreSQL • MongoDB • REST APIs • Authentication & Authorization • Real-Time Databases • Cloud Functions • Third-Party API Integrations I’ve built products involving multi-user workflows, admin dashboards, role-based access control, payments, subscriptions, scheduling, social feeds, marketplaces, booking systems and real-time communication. 🚀 PRODUCTS & FEATURES My experience includes: • AI-powered applications • SaaS platforms • Marketplace applications • Healthcare & wellness apps • Fitness and health tracking • Booking & scheduling platforms • Social networking applications • Real estate products • Delivery and on-demand applications • Education and learning platforms • GPS and location-based applications • Client portals and admin dashboards • PWA and responsive web applications 🛠️ CORE TECHNOLOGIES Flutter • React Native • Swift • SwiftUI • Kotlin • Dart • iOS • Android • React • TypeScript • JavaScript • Node.js • Firebase • Supabase • PostgreSQL • MongoDB • REST APIs • OpenAI • LLM APIs I also use modern AI-assisted development tools such as Claude, Lovable, Replit, Cursor, Base44 and GitHub Copilot when they make sense for prototyping, development, code review, refactoring or accelerating product delivery. If you need a Mobile App Developer to build a new product, an AI Mobile App Developer to add intelligent capabilities, or an experienced engineer to take over and modernize an existing application, I can help take it from codebase to production.