Muhammad Zubair Abdullah K.

I'm a senior React Native developer and full stack developer with 5+ years of shipping production apps for iOS, Android and the web. I also work as a React.js developer, SaaS product developer and AI app developer, so one person can take your idea all the way to the App Store, Google Play and the browser. I use AI to work faster, with security in mind, and I review and test everything myself before it ships. You get the speed without AI-generated mess. What I offer: - As a React Native developer, I build iOS and Android apps with Expo or the React Native CLI, from the first build to App Store and Google Play release. - As a React.js developer, I build fast React and Next.js web apps, admin portals and dashboards. - As a full stack developer, I also own the backend, with Node.js and TypeScript APIs on PostgreSQL, MongoDB or Firebase, Stripe payments and real-time features. - As a SaaS product developer, I build multi-tenant platforms with subscriptions, user roles, and AWS infrastructure with CI/CD. - As an AI app developer, I add chat assistants, text-to-image, speech-to-text and OpenAI or ChatGPT API features to web and mobile apps. - Security and code reviews that tell you plainly what to fix first. Some of my work: - A multi-tenant HR compliance SaaS on AWS, where I was the lead SaaS product developer for the architecture, backend, AWS infrastructure and CI/CD. It runs a Node.js (NestJS) backend and a Next.js frontend, with PostgreSQL row-level security per company, encrypted documents and a tamper-evident audit trail. All infrastructure is in Terraform, and CI/CD signs in to AWS without stored keys. - A food delivery platform where I was the React Native developer for the customer, restaurant and driver apps, the React.js developer for the web admin portal, and the full stack developer for the real-time Node.js and WebSocket backend with Stripe payments, live driver tracking and push notifications. - An AI chat assistant app, built as both the AI app developer and React Native developer, with the ChatGPT API, saved chat history, multi-language support and in-app subscriptions. - An AI art generator app with text-to-image prompts, art styles, Firebase push notifications and in-app purchases. - A charity donation platform I built as a React.js developer, with global search, filters by country and sign-up forms for charities. - A food donation app with Google Maps and social login, and an Instagram analytics app with Stripe and push alerts, both built as a full stack developer with React Native and Node.js. - An invoice app with Stripe payments and in-app purchases on Firebase, and a PDF scanner that reads documents on the device through Google ML Kit and Apple Vision native modules. How I work: - Security is built in from day one, not checked at the end. - I think like a SaaS product developer even on small projects, so the architecture, data isolation and hosting costs hold up as you grow. - As an AI app developer, I add usage limits, cost controls and human review to AI features, so they stay useful and affordable. - You get clear updates and honest estimates, and I'll tell you early if something is a bad idea. - I take ownership of the result, not just the ticket. My reviews say the same: reliable, clear communicator, committed to quality. If you need a React Native developer, full stack developer, React.js developer, SaaS product developer or AI app developer for your next app, send me a message. I usually reply within a few hours. Search Text: React Native developer, React-native developer, React Native app developer, Expo developer, mobile app developer, iOS developer, Android developer, full stack developer, full-stack developer, fullstack developer, full stack mobile developer, full stack mobile app developer, full stack React Native developer, React.js developer, ReactJS developer, React JS developer, React developer, Next.js developer, NextJS developer, Node.js developer, NodeJS developer, TypeScript developer, JavaScript developer, web app developer, SaaS developer, SaaS product developer, SaaS app developer, MVP developer, AI developer, AI app developer, AI chatbot developer, ChatGPT API developer, OpenAI developer, Firebase developer, Stripe developer, MongoDB, PostgreSQL, AWS developer, cloud infrastructure, CI/CD, DevOps, automation, API integration