Build AI Systems for Discernment, Not Approval - Angel Ortmann Lee, Duolingo
Jul 7, 2026 · 25:53
Angel Ortmann Lee, a Software Engineer at the Duolingo English Test, argues that human-in-the-loop AI systems often fail because humans cognitively surrender—adopting AI output with minimal scrutiny, as seen in a Wharton study where 80% accepted wrong AI answers. At Duolingo, an experiment with fake AI cheating alerts showed skilled proctors flagged legitimate sessions 50% of the time due to automation bias. A simple guideline change emphasizing independent evidence boosted accurate rejections by 21%, proving the fix lies in engineering the interaction, not better models or oversight. Lee outlines design principles: engineer reasoning patterns (e.g., frame humans as investigators), match friction to stakes (add review gates for high-stakes decisions), treat every interaction as a label (capture diffs when humans override AI), and proactively define success metrics to structure interactions that yield high-quality data. The flywheel of intentional design yields a virtuous cycle of better data, models, and human judgment.
