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Biological Age from Blood Work
See how a mortality prediction algorithm became a production API calculating biological age from blood work, covering unit conversion errors, model limits, and biomarker ranking.
I’ll show you how I turned a 2018 mortality prediction algorithm into a production API that calculates “biological age” from 9 blood biomarkers—and the surprising engineering problems that emerged. The demo walks through: (1) why unit conversions almost destroyed us (one wrong conversion = 10 years off), (2) how we detect when the linear model breaks down and produces negative ages, (3) our counterfactual engine that ranks which biomarkers matter most for each individual, and (4) why population benchmarking was harder than the core algorithm. You’ll see live requests, edge cases that produce impossible results, and the mathematical tricks we used to make confidence intervals fast.