Open to internships & full-time roles

Hi, I'm Jay.
I build iOS apps.

I like building things that make a difference in people's lives — taking an idea all the way from a sketch to the App Store. Studying Statistics + CS at Cornell ('26).

See my apps Get in touch

Selected projects

Featured

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CalmingBeats Home Screen widgets, small and medium

CalmingBeats

Biofeedback for effortless calm · iOS + watchOS

Features

On-wrist haptic beats driven live by HRV data from HealthKit
Paired iPhone + Apple Watch sessions with synced state
Post-session score breakdown plus a guided journal with insights
Home Screen widgets surfacing today's calm score and session count
Live Activity that tracks an in-progress session from the Lock Screen
Session history and trends backed by Firebase
StoreKit 2 in-app purchases with subscription entitlement gating
Shipped from TestFlight beta to public App Store release

SwiftUIUIKitwatchOSWidgetKitActivityKitHealthKitStoreKit 2Firebase

APP STORE ↗

ParentHelper

Privacy-first accessibility assistant · iOS

Features

Reads Gmail aloud as simplified-Chinese summaries
Freeze the screen and tap any section for a translated explanation
Guided in-app browser: big tappable buttons for each page action
All AI reasoning on-device with Apple Foundation Models — zero third-party calls
Gmail OAuth 2.0 + PKCE with Keychain token storage

SwiftUIOn-device AIGmail APIWebKit

In development

ReadLay

Book trading for students · iOS

Features

Browse, list, and trade textbooks between students
Figma designs translated into polished SwiftUI views
Modular components with explicit state management
REST API backend, built under hackathon time constraints

SwiftUIREST API

DEMO ↗ CODE ↗ Most Creative — Cornell Hack Challenge

StudySpot

Campus study-spot finder · Web

Features

Find and compare study spots across campus
Built-in Pomodoro timers and task tracking
Solo-built and deployed on Vercel, live at studyspot.space
Shipped end-to-end with an agentic AI-assisted workflow

JavaScriptVercelClaude Code

VISIT ↗

Tech stack

Languages

SwiftPythonJavaC/C++JavaScriptSQLHTML/CSSR

iOS / Mobile

SwiftUIUIKitwatchOSTCAMVVM / MVCCombineFirebaseCoreML / Create MLXCTestApp Store deployment

Backend / Data

REST APIsGraphQLpandasNumPyscikit-learnPyTorchTensorFlow

Tools / Practices

Git & GitHubCI/CDAgileDockerLinuxFigmaVercelAI-assisted dev (Claude Code)

Experience

May 2026 — now

Founding iOS Engineer & Product Manager

SomaBeats Health Inc.

Own the full iOS + watchOS + widget codebase for CalmingBeats; drove it from TestFlight beta to public App Store release.
Built a HealthKit-backed session-history feature that persists data across app reinstalls via workout metadata.
Designed a singleton SessionCoordinator and provider/repository pattern; delivered watch-to-phone round-trips via WatchConnectivity.
Upgraded the Daily Calm Score to a composite HRV/resting-HR model, increasing score updates from ~1/day to ~10–30/day.

Fall 2025 — May 2026

iOS Course Instructor

Cornell University — CS 1998

Instructed 50+ students and led 11 TAs on Swift, SwiftUI, UIKit, MVVM/MVC, Firebase, REST APIs, and App Store deployment.
Authored new lecture content on on-device machine learning with CoreML and Create ML.
Mentored students on Git, app architecture, and the full iOS development lifecycle.

Feb 2025 — May 2026

iOS Developer / Software Engineer

Cornell App Development

Led iOS development of the Clocktower app, owning the Swift/SwiftUI implementation to digitize the Cornell Chimes experience.
Shipped SwiftUI components for Score (200+ downloads at launch); built Hustle's home screen and search from 0-to-1 with TCA.
Implemented secure auth with Firebase Auth and Google Sign-In; integrated REST/GraphQL APIs and translated Figma designs into UI.

Let's build something.

Open to internships & full-time software engineering roles.

jidong.1272@gmail.com GitHub LinkedIn

Hi, I'm Jay.I build iOS apps.

Selected projects

Featured

Tech stack

Experience

Let's build something.

Hi, I'm Jay.
I build iOS apps.