Writing
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When Does Model Complexity Pay Off?
Lessons from a short-horizon time-series bake-off: sequence models out-ranked gradient boosting by 0.016 to 0.030 AUC, and higher AUC did not reliably translate into better decisions.
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Building a Point-in-Time Correct ML Feature Store
Point-in-time joins don't guarantee causal features. How we built a feature store with seven enforced safeguards—and uncovered four data leaks that had passed earlier validation.
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Can AI Coding Agents Build Reliable Software?
Across two engineering projects and nearly 3,200 commits, AI coding agents built software, introduced defects, and implemented safeguards that exposed them. What the failures revealed about engineering reliability, enforceable rules, and human oversight.
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Why Offline ML Evaluation Fails
Eleven documented failures of look-ahead leakage, selection bias and offline/live mismatch survived conventional validation. How prefix tests, historical-data audits and serving-path replay exposed them—and the engineering safeguards built in response.
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Numerical Reproducibility in ML Systems
A reference's answer is its arithmetic, not its formula. Comparing seven reimplemented packages with scikit-learn, scipy and pandas, bit-exact where achievable, exposed fused multiply-adds, summation orders and stopping rules the documentation never states—and 38 defects underneath.
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Crow, a Programming Language
A small general-purpose language that reads like Python, compiles to Rust, runs the same program interpreted or compiled, and builds web applications with no JavaScript. What the simplicity buys, where the speed comes from, what you can build with it today, and how to try it in a minute.
