This question evaluates a data scientist's competency in designing metrics under time constraints, balancing simplicity versus robustness, communicating assumptions to stakeholders, and responding to critical feedback.

Describe a time you chose a simpler metric under tight time constraints and later received critical feedback that it was oversimplified (e.g., from a recruiter or interviewer). Using STAR: 1) Situation/Task—why was simplicity necessary and what risks did you accept? 2) Action—how did you communicate trade-offs, preempt misunderstandings, and validate the metric’s robustness (sensitivity checks, backtests)? 3) Result—what happened and how did stakeholders react? 4) Reflection—what would you do differently next time (e.g., present a primary metric plus guardrails, document assumptions, or offer a phased refinement plan) to avoid a 'red flag' while still shipping on time?