redaction

A deceptively simple screener: each detection method maps to a PII class, and the 'why not regex for names' sub-question has a precise answer about structure vs context that interviewers use as the pass bar.

An architecture question with a defensible right answer, and interviewers are tired of 'it depends.' Here's the split that survives both the platform team's consistency argument and the app team's context argument.

The four-point redaction design is becoming the standard FDE privacy round. Most candidates fortify the chat box and lose on the other three doors, here's the full design, including the de-redaction map that makes it usable.