Grokking the AI System Design Interview

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Monitoring, Drift, and Retraining

1. The System Is Rotting Right Now

An ML system that gets deployed and left untouched gets worse over time. Not because anything actually breaks. Because the world it modeled keeps moving on without it. Fraudsters probe the fraud model and adapt around it. A pandemic rewrites delivery times overnight. A new slang word flips a toxicity classifier's confusion matrix. This decay has a name: drift. Designing for it is what separates "I trained a model" answers from "I ran a model in production" answers.

There are two kinds. Learn to distinguish them by name, because interviewers do:

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