17 Sep 2026
Your Model Is Not the Product
The model is perhaps a tenth of what you are shipping. The other nine tenths decide whether anyone keeps using it.
Featured
10 Sep 2026
Evaluation Sets That Lie to You
A held-out set is only held out if it was separated before you started making decisions. Usually it was not.
18 Sep 2026
Why evaluation is the hard part of applied AI
The model is rarely the bottleneckMost projects fail on evaluation, not architecture.Define the decision firstBuild the test set before the model
Artificial Intelligence · 17 Sep 2026
Your Model Is Not the Product
The model is perhaps a tenth of what you are shipping. The other nine tenths decide whether anyone keeps using it.
Artificial Intelligence · 10 Sep 2026
Evaluation Sets That Lie to You
A held-out set is only held out if it was separated before you started making decisions. Usually it was not.
Artificial Intelligence · 1 Sep 2026
Retrieval Is Mostly Chunking
Swapping embedding models buys you a little. Getting chunking right buys you a lot. The attention goes the wrong way round.
Software Engineering · 23 Aug 2026
Write the README First
If you cannot explain the thing in a page before building it, the design is not finished.
Teaching · 10 Aug 2026
Teaching Senior Engineers Is a Different Job
They are not missing information. They are carrying instincts that mostly transfer, and occasionally do not.