Jonathan Gan — React Native & Mobile Engineer

About

Mobile engineer building AI-powered, hardware-aware apps — from concept to App Store.

I'm a Miami Beach–based mobile engineer with 7+ years in software and 5+ shipping production React Native systems across iOS, Android, and watchOS. I build apps around on-device AI, camera and hardware integrations, and offline-first architectures for fintech, healthcare, and consumer products.

I own delivery end to end — architecture, native Swift and Kotlin modules, CI/CD, App Store release engineering, and post-launch iteration — and I've published apps, open-source modules, and AI tools along the way.

React Native Expo Expo Router TypeScript Swift Kotlin watchOS HealthKit LLM / AI Apps App Store Connect

Experience

Experience and background

🧑‍💻 GitHub portfolio 💼 LinkedIn

Freelance Software Engineer

Remote · Jul 2024 – Present

Designed and shipped client and independent mobile products from concept through production using React Native and Expo, owning end-to-end delivery across mobile UI, backend APIs, databases, authentication, payments, native integrations, hardware-aware features, CI/CD, App Store readiness, and QA.

Senior Analyst III / Delivery Cloud Engineer

Kin + Carta · 2022 – 2024

Delivered React and enterprise engineering solutions for Syngenta Digital, including responsive interfaces, Java code audits, regulated delivery support, and cloud deployment automation that improved release reliability.

React / React Native Developer

ChainBytes LLC · 2021 – 2022

Built and enhanced mobile and web features for a Bitcoin ATM platform, including real-time transaction interfaces and wallet-aware mobile experiences.

Featured

Shipped products, open source, and published work

TypeScript

Expo Sony Camera

Control a Sony camera from React Native — live view, remote capture, and robust error handling — without leaving Expo. Published MIT module with 13 GitHub stars since its July 2026 launch.

Author and maintainer of a cross-platform native module (Kotlin + Swift bridge)
Live view and remote capture over PTP with structured error handling
Published on npm with developer documentation

📦 NPM Package

TypeScript

ReelAgree

Movie-night planning with blind group voting — everyone picks privately, then the server reveals consensus. No spoiled endings, no vetoed suggestions.

Blind votes stay hidden until every member has voted
Server-authoritative consensus flow, immune to client-side tampering
One codebase shipping to public web, iOS, and Android

🎬 Group movie planning

TypeScript

PrepAI

A private health intelligence app — all AI runs on-device. No account, no cloud, no data leaving your phone.

On-device inference with clinical knowledge logic
HealthKit ingestion and local-only storage
Fully functional offline; iPhone release in progress

🧠 AI health app

TypeScript

ListingOS

Product photos to review-ready eBay drafts — capture an item, let AI draft the listing with marketplace-verified pricing, then publish from one review screen.

Camera-first capture; AI generates titles, categories, descriptions, and item specifics
Pricing backed by active eBay comparables, with publish blockers surfaced before review
Direct fixed-price publishing after explicit seller approval

📸 Photo-to-listing AI

watchOS

PushUp Timer Pro

Published Apple App Store workout timer app for watchOS, featuring one-handed interactions, HealthKit integration, and production release engineering.

⏱️ Live on App Store

JavaScript