Walkthrough on LegalRealist AIhttps://legalrealist.ai/tags/walkthrough/Recent content in Walkthrough on LegalRealist AIHugo -- gohugo.ioenhi@legalrealist.ai (LegalRealist AI)hi@legalrealist.ai (LegalRealist AI)© 2026 LegalRealist AIMon, 25 May 2026 00:00:00 +0000Building a Medicare Fraud Backtest in One Claude Code Sessionhttps://legalrealist.ai/posts/38-backtest-walkthrough/Mon, 25 May 2026 00:00:00 +0000hi@legalrealist.ai (LegalRealist AI)https://legalrealist.ai/posts/38-backtest-walkthrough/A walkthrough of building a Medicare fraud backtest overnight in Claude Code — from a plain-English spec to 289 matched providers across 41 states, a predictive model with AUC 0.79, and out-of-sample validation. Including the three times the pipeline failed, the data duplication bug, and the engineering decisions that shaped the final design.