From Vietnam to Yokohama — the long way to two products
I started writing software in Vietnam more than a decade ago, and I haven’t stopped building since.
Since then I’ve built backends across very different worlds — AdTech handling ten million requests a day, an emotion AI that helps machines understand how people feel without a single touch, and carbon accounting, first at VertZero and now on the Data & AI team at Zeroboard.
Across all of it, one thing kept proving true:
A machine is only ever as good as the human who leads it.
Then the AI agents arrived — fast, tireless, and confidently wrong. Everyone reached for more of them. I reached for judgment instead: the discipline a good lead brings to a team. I turned that discipline into two products.
What I’m building now
An open-source toolkit for the human in the loop. Skills makes the agent in your editor follow real engineering discipline — investigate, design, test-first, review, verify. Flow lets you stand up your own team of agents in YAML, with durable state and clear lines of authority.
A GitHub App that reviews your pull requests with a Claude · Codex · Gemini ensemble, then puts every finding through a verification gate before it ever reaches you — so your team stops learning to ignore the review.
The path so far · 13+ years
- Backend Developer · FPT Software, Vietnam Backend systems for enterprise clients.
- Co-founder & Lead Engineer · Realkai Media Vietnam’s first programmatic ad-bidding platform.
- Engineer & Data Specialist · FPT Software, Japan Cloud and machine-learning forecasting on AWS.
- Senior Software Engineer · Olive, Japan Real-time, touchless emotion AI.
- Lead of Engineering · VertZero Enterprise carbon accounting; led the team.
- AI Software Engineer · Zeroboard, Japan Now Building AI on the Data & AI team.
The through-line was never the machine. It was the person in the loop — and a standard I’ve never been willing to lower.
— Tuan · Yokohama, 2026