Cheng "Jaycee" Jiang
Full-Stack Engineer
open to work & projectsAI Agent Engineering · Full-Stack Dev · Algorithmic Trading · OPC Coaching
Los Angeles · Hong Kong · Shenzhen
Dual master’s degrees from RPI (Computer Science and Management, full scholarship). Two years at Silicon Valley startup Quixey, then eight at Snap, where I cut iOS app startup time by 60%+ and built the app landing camera module for 150M+ users. I now design and build production AI systems end to end — trading engines, consumer platforms, and supporting infrastructure — with an agent-driven workflow proven in production.
selected work
Build your own quant trading strategies — no coding, from first-time users to professional desks
10quant.com is a quantitative trading platform: define your own entry and exit rules, backtest in one click, go live in another — zero code. Professional users get custom indicators, dual-axis backtest charts, and live monitoring. The system scales elastically for complex, high-concurrency workloads, with every strategy isolated in its own secured Docker container.
TypeScript · Python · FastAPI · Next.js 16 · React 19 · Supabase · Redis · Docker
Controllable AI Film Studio
High-quality short-video generation with consistent characters across shots
A locally deployed AI short-film system with custom characters: script co-writing, automatic character lookbooks, storyboards, motion, voiceover, and subtitles. Per-character LoRA fine-tuning — a method that teaches the model to remember each character’s face — keeps every character consistent across shots; switch to cloud rendering when faster delivery matters.
FastAPI · Apple MLX · FLUX · Qwen-Image-Edit · Wan 2.2 · mlx-audio TTS · Next.js 16
Medical care in China, made accessible: care coordination for foreigners and medical travelers
A medical-care platform for foreigners coming to China: appointments, airport pickup, lodging, and visit accompaniment — bilingual at every step — plus ticketing, realtime chat, quotes and orders, and Stripe payments. It addresses how hard it is for foreigners to get care in China, and serves inbound medical travel.
TypeScript · Next.js 16 · React 19 · Supabase · Stripe · Playwright
AI tarot & astrology service: 15K+ registered users, 13 languages
An online tarot product: free tarot card readings plus paid in-depth reading reports, alongside relationship compatibility analyses, a companion chat, and bookings with human readers. The whole product runs on a multi-agent pipeline.
TypeScript · Next.js 16 · React 19 · Supabase · Vercel AI SDK · Gemini · Stripe · NOWPayments
Polymarket Arbitrage
Weather models beat the market odds — buy low, sell high on Polymarket
Weather models (NOAA GFS, Aurora, GraphCast, Pangu-Weather) compute probabilities for Polymarket’s weather markets; when those probabilities diverge from the market odds, the system arbitrages the spread. An LLM agent analyzes the markets and executes the trades end to end.
Python · NOAA GFS · Aurora · GraphCast · Pangu-Weather · GLM-4 · Polymarket CLOB
Digillect — AIGC Services
One-stop AIGC services: images, video, voice, and music
Backend for an AIGC product: generates stylized images, video, voice, and music. A high-concurrency AI inference queue system, with Kubernetes handling automated elastic resource scheduling.
Python · FastAPI · LangChain · OpenAI · Replicate · Firebase · Stripe · Kubernetes
experience
Applied AI LabsOperating trading systems, delivering client automation, and building the platforms listed above.
DigillectTook a consumer AIGC company from zero to launch: an iOS app, a Discord bot, and ML inference on K8S/GCP.
Platform work at 150M+ daily-user scale: cut iOS startup time by 60%+, rebuilt the camera platform as modular components, and delivered realtime media pipelines.
QuixeyDeveloped semantic search powered by deep-learning embeddings, alongside a self-updating knowledge graph.
Rensselaer Polytechnic Institute (M.S. in CS, MBA, 3.97 GPA, Full Scholarship), Sun Yat-Sen University, SZSY.
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