Vertical AI Teams Need Domain Experts Who Own Quality Loops
Chris Lovejoy of Notius Labs argues that vertical AI companies increasingly fail or succeed on whether they can turn domain judgment into product quality, not simply on access to better models. He proposes three operating models for that expertise: an Oracle who both judges and changes outputs, an Evaluator who defines and measures quality while engineers implement fixes, and an Architect who designs systems that improve from use. His case studies of Granola, Tandem and Anterior show why the right model depends on whether quality is subjective, measurable, or too variable for manual iteration.
AI Engineer·May 16, 2026·14 min read
