I build Apps, Agents, AI tools & more.

Hey, I'm Justin (Ziheng). I'm studying Management & Analytics at NYU after a B.Sc. in Statistics & Mathematics at U of T. I build native apps in Swift, agents and AI tools on top of LLMs, and the backends and data work that keep them running.

Currently building Apps · docs at docs.ijustinz.com

Email me See work

ohmybody

iOS Health Dashboard

Workouts, Activity Rings, sleep and vitals from Apple Health, with calendar widgets. On the App Store.

Justin Zhong@iJustinn

Launched docs.ijustinz.com, the documentation hub for the ohmytask, ohmycoin & ohmybody apps.

June 2026

TSohmycoin Backend

AI API on Cloudflare Workers

Hardware-attested sessions and a server-side proxy for expense extraction, so AI keys never ship in the app.

ohmycoin

iOS Spending Tracker

Fast expense entry, voice and receipt capture, budgets and AI spending insights. In public TestFlight.

ohmytask for Mac

macOS Task Manager

A Mac-native edition of ohmytask with a boards sidebar, sharing its SwiftData backend with the iOS app.

Justin Zhong@iJustinn

Started my M.Sc. in Management & Analytics at New York University.

September 2025

JSJobMuse

Career Ops GUI

A local-first workspace that runs AI-assisted job scans and reports, and streams logs back to the GUI.

ohmytask

iOS Task Manager

Kanban boards, a Notion-style task editor, reminders and widgets, plus a natural-language Task AI. In public TestFlight.

TSohmytask Backend

AI API on Cloudflare Workers

A stateless AI relay: the iOS app runs tool calls locally against SwiftData, the backend only brokers model turns.

Justin Zhong@iJustinn

Joined Xiaomi's Proretail team as a backend developer intern. Built clue-statistics modules and cut clue-count response time by about 100 ms with SQL tuning.

July 2024

JNASA Space Apps

Global Hackathon Backend

REST-style APIs over official NASA data with real-time and manual fetching, and API contracts for the frontend.

RToxi-Can

Canada's Industrial Pollutants

An interactive, multi-page story that makes environmental risk data readable for non-technical audiences.

Justin Zhong@iJustinn

Graduated from the University of Toronto with a double major in Statistics & Mathematics.

July 2025

RHouse Price

U.S. Real Estate Trends

Statistical models over two decades of housing prices, with regional comparisons in ggplot2.

JMedia Manager

Spotify Desktop Client

A Java Swing app over the Spotify API, where I led the team and built the search and song-add flows.