AI · Machine Learning · App Development

CharlesTsoi

Fourteen years in enterprise delivery — now learning and building in AI, machine learning, and mobile products.

Designing 北辰 (North Star) — a Bazi/ZiWei astrology app inspired by Co-Star, targeting iOS. Writing about GenAI systems architecture on Medium.

14 Years experience · 6 Employers · 4 Certifications

Career timeline

Fourteen years of delivery.

Mobile product ownership

Product Owner

2012 – 2018

Cathay Pacific mobile app grew from ~10,000 to ~120,000 monthly active users (12x) during my ownership
Owned product lifecycle and PSS integration across six years

Selected work

In production

AI / ML

Solo-built AI health literacy tool — bilingual X-ray education, live on Vercel

In production

Enterprise AI

Product design and vendor delivery — estimated 80% less manual reporting time

In progress

Mobile

Bazi/ZiWei astrology app for iOS — design phase, user stories mapped

Open to projects

Open to collaborations, consulting, and full-time roles. If you have a problem in AI, ML, or app development, I’d be glad to talk.

Available for AI, machine learning, and mobile app projects — from early PoC through shipping.