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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Other projects

6
ReadLay
Book trading for students · iOS
Most Creative — Cornell Hack Challenge

A book marketplace for students — browse, list, and trade. Figma designs translated into modular SwiftUI views over a REST API, built under hackathon time constraints.

SwiftUIREST API
DEMO ↗ CODE ↗
MirrorBot
A robot that introduces strangers · Research
Architectural Robotics Lab — Cornell

A mobile robot with actuated mirrors that puts two strangers in mutual gaze. Co-designed the mirror-control algorithm on stereo-camera depth over ROS, plus a finite-state controller coordinating perception and actuation. The lab's work on MirrorBot went on to ACM/IEEE HRI 2026, where I'm credited in the acknowledgments.

ROSOpenCVPythonArduino
VIDEO ↗ PAPER ↗
GPT Inside Out
A transformer, rebuilt from scratch · Research
STARS Fellowship — Cal Poly Pomona

Reconstructed transformer attention in Python and trained a scaled-down GPT to study token prediction and context-window effects, then extended it with LoRA fine-tuning.

PythonTensorFlowTransformersLoRA
Rock-Paper-Scissors Predictor
Predicting the next throw · Machine learning

A Siamese network with a ResNet backbone that compares action histories to predict outcomes — 88% accuracy, beating logistic-regression and random-forest baselines.

PythonKerasNumPy
Marketplace Pricing Analysis
What makes a listing sell · Data science

Led an analysis of Depop listing and transaction data — engineered brand-popularity, listing-frequency, and time-to-sale features, then modeled the drivers of sell-through and price dispersion.

pandasNumPyscikit-learn

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.
Jay Zheng

Let's build something.

Open to internships & full-time software engineering roles.

jidong.1272@gmail.com GitHub LinkedIn