Mensetsu
Chapter 00 — Open to Product Manager roles
I ship AI products in Tokyo.
Co-founder and product lead in Tokyo. Zero to 500 users in three months, and multi-agent systems on the Anthropic stack.
Scroll to enter
01
The Work
Three products with real users, built and shipped.
02
Case Studies
The decisions behind each one, and what they returned.
03
How I Work
The operating principles I hold, and why I hold them.
04
Claude Partner
A Claude Partner Network company, specialising in Claude Code.
05
Apps Shipped
Three apps live on the App Store, built with my co-founder.
06
Contact
Open to Product Manager roles in Tokyo or remote.
東京で作る
01 — The Work
Three products, real users, already shipped.
Business card exchange in Japan is not a formality you can design away. It is a fixed ritual at the start of every meeting. A tool that ignores it gets refused on first contact; a tool that respects it inherits a habit every company already has. That is the product I took to market.
Zero to 500 users in three months from a standing start, and cards now carried by people at Google, ASICS, Turnitin and GLOBIS. Alongside it I design and deploy the agent systems I specify — four of them, on the Anthropic stack, reasoning over live data through MCP rather than guessing.
See the case studies03Products
500Card users
2025Founded
N2Japanese
02 — Case Studies
03 — How I Work
Five principles. One way of working.
These are not slogans. Each one came from something that worked, or something that cost me, on a product with real users attached to it.
01
Prototype before you specify
I build the flow myself first, find where it breaks, then write the spec that already survived it.
0 → 500
02
Define the metric first
If I cannot say which number moves, the feature is not ready to be built yet.
7.5M views
03
Bilingual by default
I run the Japanese room and write the English spec, so nothing is lost in the handoff.
JLPT N2
04
Ship weekly, cut hard
Zero to 500 users in three months came from shipping continuously, not from a perfect plan.
3 months
05
Build what you specify
I design and deploy the agent systems myself, which is what keeps my requirements honest.
4 agents
05 — Claude Partner
A Claude Partner Network company.
International Design is part of Anthropic's Claude Partner Network, specialising in Claude Code. My co-founder Carlos Lastres holds the Claude Partner Badge, and it is the tool the two of us build with every day.
That matters here for one reason. Nothing I say about shipping with AI is theoretical. I design the agent systems, write the prompts and workflow definitions, and run them against live data — then I write the requirements the engineering team builds from. This site is one of the things that stack produced.
See what we shipped2026Recognised
CodeSpecialisation
03Apps shipped
1.6KUsers reached
06 — Apps Shipped
Chapter 04 — Contact
Available
I am open to Product Manager roles in Tokyo or remote. If you are building something with AI at the centre of it, I would like to hear about it.
Get in touch