I build AI systems for the real world.

I help technical founders and product leaders turn promising AI ideas into reliable products. I also build enterprise systems where security, cost, and human judgment matter.

Google · AWS 11× · Datature · Rafayenterprise AI platform · regulated bank4 live apps → open them
01

the starting point

AI Product Reality Sprint

10 business days

Make the risky part real before you scale it.

We identify the critical workflow, shape the architecture, build a working vertical slice, and expose the cost, security, and reliability risks before you spend months scaling the wrong system.

see the sprint →scope first · price after fit
02

the one that proves it

enterprise proof · anonymized

A document-understanding platform for a regulated Malaysian bank

Designed, built, and shipped an AI document-understanding platform inside a regulated, data-resident, human-in-the-loop environment, where the model is the easy part and everything around it (residency, auditability, a human who can always say no) is the hard part.

bank-controlled perimeter · on-prem / private vpc · residency · least-privilege
1
secure ingestion
2
OCR & normalize
3
layout & table parse
4
LLM extract + confidence
5
validation & rules
6
structured output
↳ low-confidence → human review (accountable)
═ audit & observability spine · lineage · model version · confidence · human action · outcome ═
phase 0 discovery & constraint mapping: turn “regulated” into a written envelope with risk/compliance.
phase 1-3 architecture → pipeline → human-in-the-loop: built stage by stage, signed off with governance.
phase 4-5 hardening, UAT, production handover: delivered as a capability the bank owns.
read the full case →
03

field notes

all writing →

Notes from building AI systems that have to survive real constraints: cost, governance, reliability, and human judgment.

05

how I work

01

End-to-end ownership

Whiteboard to production to handover. The measure is whether the client can run it after I leave.

02

Cost is a design constraint

I track what every system costs to run, and optimize it. I do it for my own portfolio too.

03

Human-in-the-loop AI

In regulated settings the human is the control, not the inefficiency. Confidence-gated, auditable.

06

contact

Have an AI product that needs to become reliable production software? Start with an architecture and build sprint. If the problem needs longer-term leadership, that can grow into fractional CTO work.

yeefei@yooi.me · Singapore

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