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A running notebook on software, engineering, and the wider tech industry — short notes, occasional deep dives, and whatever I'm figuring out.

Apr 30, 2026 · 8 min read
Knowing When the Model Is Actually Right
The first thing I built when I joined the team wasn’t the model. It was the eval harness. That sounds like a contrarian take, but it isn’t. It’s just what the work demanded. The product ships coachin…
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