CS + Industrial Engineering @ UC Berkeley · San Diego, CA
Welcome to my corner of the coast. I build things.
The 3D version needs a newer browser — everything's here too.
AI Engineer · Apr 2025 – Present
Building an agentic RAG system for doctors — five tools, dynamic routing, hybrid SQL + vector retrieval, with security enforced at the database layer (Postgres RLS), not the prompt. The agent is explicitly untrusted; the data stays safe anyway.
Software Engineer · summer 2025
Numerical algorithms in NumPy — Gaussian elimination, eigenvalue methods. Made the math 40% faster and the predictions 30% better.
CTO & Co-Founder · 2024–present
I walked into 35+ restaurants as a high schooler with no budget and asked them to give students discounts. It worked: 500+ students eating cheaper, recognition from the California Senate, Legislature, and the Mayor of Encinitas.
AI Research Assistant · 2024–2025
Built a real-time CNN classifier in Python/OpenCV that hit >95% accuracy at <50ms on a webcam.
Game Developer · 2023–2025
A browser MMO with 50,000+ players — WebSockets, 60 FPS, web/iOS/Android, no engine. It's still live.
The MMO. FSM enemy AI, delta-time game loop, predictive aim, adaptive difficulty — all raw Canvas 2D.
The restaurant platform. Flask/AWS, 500+ users, 35+ partners.
Scheduling shouldn't take 10 minutes. Claude API + Google OAuth + Cloudflare Workers gets it under one.
Minimax with custom heuristics. Wins 98% of 10,000+ simulated runs.
Build — Python · TypeScript / JavaScript · SQL · NumPy · OpenCV
Ship — FastAPI · Next.js · Docker · nginx · GCP + AWS · Flask · Cloudflare Workers
Scale & secure — LangChain agents · pgvector + HNSW · hybrid retrieval · Postgres RLS · WebSockets · prompt-injection defense
Welcome to my corner of the coast. I build things — scroll and I'll show you around.
CS + Industrial Engineering @ UC Berkeley · San Diego, CA
I grew up in San Diego, ten minutes from the beach — which explains a lot about this website. I get properly obsessed with the things I love: games, soccer, languages, lifting. Not because I have to win, but because I can't leave a thing alone until I understand how it works.
the gear around the campfire has stories — hover it
Tools I actually use, not a keyword wall.
Every lit building here is a real job. The further down the hill, the closer to today.
Look at the view...
The boats are things I've built. The big one earned it.
© Kairui · Built by hand with Three.js — take the helm, or take to the sky.