Regression-diagnosis take-home

The take-home is the round where craft shows. The brief: “p99 completion latency jumped after release N - find the cause.” You get a synthetic dataset and 4 to 8 hours. What's graded isn't just whether you find it, but whether your write-up reads like something an engineering lead could act on in five minutes.

Diagnose like an incident, not a data dump. Localize, rule out confounds, quantify the blast radiusHow much breaks if a change goes wrong; the scope of potential damage. Press Enter for the full definition., then lead the write-up with the decision. Most candidates invert that order and bury the recommendation under their EDA.