Zixiang Zhang

Software Engineering · Machine Learning & AI Systems

Mathematics & Statistics graduate (University of Toronto) with a track record of shipping 12+ applications on the App Store. Focused on machine learning and reliable AI agent systems, with hands-on experience in model training, agent governance, and production-grade tooling.

Engineering Experience

Independent Software Developer

2023–Present

Designed and shipped 12+ applications for Apple platforms with 1.76k downloads worldwide, owning product design, implementation, testing, performance optimization, localization and final product delivery.

Selected Technical Projects

Sonodex App Store

Apr 2026–Present

Swift · SQLite

Built a macOS audio-library application tested against 300,000+ samples, combining transactional indexing with acoustic analysis and background processing. Reduced SQL execution work by 94% on a 30,000-asset pagination benchmark while preserving query results.

Synthorea

Mar 2026–Present

Python · PyTorch · Transformers · Mixture-of-experts

Developed a language-conditioned synthesizer model: a semantic transformer and six-expert mixture-of-experts network generate editable u-he Diva presets. Built training, evaluation and deterministic compilation pipelines for its 881 parameters.

AGN Protocol GitHub Repo

Feb–Jul 2026

Python · FastAPI · Agent orchestration · Event-driven systems

Built a multi-agent runtime coordinating model providers, task execution and independent review. Implemented policy checks, emergency-stop controls, execution audit trails and command-line/API management.

Inserable

Feb 2026–Present

Swift · TextKit 2 · Core Text · CloudKit

Developed a Markdown editor across macOS, iOS and iPadOS with source-preserving live formatting, incremental parsing, native text rendering and optional iCloud synchronization.

Education & Recognition

University of Toronto, St. George

Completed Oct 2026

Honours BSc, Mathematics & Its Applications Specialist (Probability/Statistics). Studies in stochastic processes, optimization, probability and linear algebra.

Apple Swift Student Challenge Winner (2026)

Built Convergence, an interactive 3D introduction to independent component analysis with SceneKit, AVFoundation and original multi-stem audio.

Technical Skills

Programming: Python, Swift, SQL, TypeScript, R  ·  Language: English (CELPIP 10), Mandarin Chinese (native)

ML & data: PyTorch, Hugging Face Transformers, scikit-learn, NumPy, pandas, Core ML

Engineering: SQLite, FastAPI, SwiftUI, AVFoundation, CloudKit, Git, Docker, Linux/Bash

Additional Experience

Audio Engineer, Producer & Game Composer (2020–Present) — Original sound design and music for independent games; music supported by Martin Garrix and Ferry Corsten.