Journal
What we learn along the way.
Field notes on user research, interface design and launching products. No opinion pieces, no trends: what works and what fails.
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English Only Content
Offline on Purpose, and Saying Why
On 21 October 2026, governments, hospitals and even cybersecurity agencies took their own websites offline before anyone had broken in. The flaw was in PHP. The harder problem was explaining a deliberate outage to the people on the other side of it.
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English Only Content
What AI Changes About User Research, and What It Does Not
Generative models are often presented as a substitute for studying real people. The published evidence points the other way, and suggests research matters more once a product stops behaving the same way twice.
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English Only Content
Nobody Touches Production, Including the Agent
Coding agents did not create the problem of unsupervised access to production. They made an old discipline urgent, and they made one of its weakest links, the exception path, worth rebuilding properly.
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French Only Content
Cinq utilisateurs suffisent (et pourquoi on en teste quand même huit)
La règle des cinq participants est juste, mais on la cite presque toujours de travers. Ce qu'elle dit vraiment, et le jour où elle ne s'applique pas.
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French and English
The Job No One Invoices
Many decision makers assume that a project carried from end to end requires several intermediaries. Research on sourcing gives a more precise answer, and a less comfortable one for everybody involved, ourselves included.
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English Only Content
Two Thousand Faces Every Morning
A field report from a Shanghai construction site, where augmented reality glasses had to identify up to two thousand workers against a government database before the day could start. The hardware turned out to be the easy part.