David Cohen

I build tutor copilots with syllabus grounding, misconception detection, and teacher dashboards—not homework completion bots.

• Fine-tuned small models for math step validation with human rubrics
• A/B tested Socratic vs direct hints for engagement and learning gains

1. Senior Learning Engineer

   Summit Learning Labs · 2021 — Present

   Senior learning engineer: rubric-aligned grader for free-text math steps; flags low-confidence for teacher review. Fine-tuned small models for step validation against human rubrics; quarterly calibration sets. A/B tests on Socratic vs direct hints; tracked engagement and learning gains jointly.