One person, one trade, one delivery date

I am Hoàng Văn Hào. I studied mathematics before I studied machines, and I now work as an AI engineer building generative systems that run in production at an insurance company. There is no room for a demo there. Every system has to clear a personal-data review, stay inside a latency budget, and justify a bill that somebody signs.

Outside those hours I write about how those systems actually work, daily, in English. The newsletter has run to 339 issues for 20,503 readers. 74,000 engineers follow me on LinkedIn, and I was listed in the Top 200 LinkedIn Creators Việt Nam, 8/2025. I have also self-published two books on interviewing for AI engineering roles.

What does any of that have to do with your work? Not much, honestly. It proves one thing only: I write code every day, in public, under my own name, and I have something to lose by delivering badly.

Why a Vietnamese household business

I already had a company in the United States, but its invoices are no use to a Vietnamese customer. Hộ kinh doanh Kỹ sư Trí tuệ Nhân tạo was registered on 22 April 2026 in Quảng Trị under activity 6219, Lập trình máy tính khác, tax code 044099000260. It means you can sign a contract, receive a proper invoice, and put the cost through your own books.

How I work

• One figure, agreed before anything starts, written into the contract. Nothing appears halfway through.
• A delivery date on everything, not only websites. If I am late, it costs me.
• Source, domain and every account in your name from the first day.
• Where I am not the right person, I say so immediately and point you at someone better.
• No client logos I have no permission to use, and no invented praise.

Four kinds of work, and why those four

Building is the largest part: websites, assistants that read your documents, automation of repeated work, internal software. All of it is software written to order, which is both my registered activity and my day job.

Teaching came out of writing every day. Three hours on your team's real work, eight people at most, and everyone leaves with one piece of their own work already running.

Reach is what I already do for myself: writing about engineering for engineers. Taken in blocks with an end date, because work without an end date is work I do not sell.

Hiring is the narrowest, and the boundary is explicit: I write the job post, build the hiring page, and set the technical exercise. I do not broker labour, I do not introduce candidates, and a household business cannot hold the licence to do so.