Jianlong N.

I help startups and businesses build, launch, and scale high-quality mobile applications for iOS and Android.

With 15+ years of mobile development experience and 10+ years specializing in React Native, I've delivered production applications used by hundreds of thousands of users and generated over $500,000 on Upwork through long-term client partnerships.

Whether you need to build a new product from scratch, improve an existing application, or solve difficult technical issues, I can take ownership of the entire mobile development lifecycle.

What I can help you with

✅ React Native & Expo Development

✅ Cross-platform iOS & Android Apps

✅ MVP Development for Startups

✅ AI-powered Mobile Apps (OpenAI, Claude, Gemini)

✅ Firebase & Supabase Integration

✅ Push Notifications

✅ In-App Purchases & RevenueCat

✅ Stripe Payments

✅ Authentication & Social Login

✅ Maps, GPS & Location

✅ Camera, QR Code & Media Processing

✅ Chat & Real-time Messaging

✅ Performance Optimization

✅ Crash Investigation & Bug Fixing

✅ App Store & Google Play Release

My experience

Before freelancing, I worked as a Senior Mobile Engineer at Haier (Fortune Global 500), where I participated in developing and maintaining more than 100 mobile applications, including products with over one million users.

Later, I joined a US startup as the lead React Native engineer and built the company's cross-platform mobile application from scratch. I was responsible for architecture, feature development, payment systems, live streaming, creator features, app performance optimization, and long-term product maintenance.

Today, I primarily work with startups and established companies to build reliable, scalable mobile products that are ready for production.

Why clients work with me

✔ 500K+ earned on Upwork

✔ 10,000+ development hours