Field notes — essays & research notes

Things I've written down.

Ruby, Rails, performance, security and applied machine learning. Updated when something feels finished.

All Ruby & Rails Security LLM & Agents MLOps Computer Vision Big Data Research
1 post in Research
RESEARCH 12 / 08 / 25

Taking over a stalled model: 49% to 77.7% recall

A skin-cancer classifier that looked fine on accuracy and was missing half the cases that mattered. Mostly a story about optimising the wrong number.

4 min