The 60-second answer
Define the abuse taxonomy and operational action separately from the score: downrank, challenge, review, or enforcement have different error costs. Combine content, account, behavioral, graph, device, and temporal signals; build labels from reviewed cases while guarding against adversarial label contamination.
Build the answer in this order
Define the abuse taxonomy and operational action separately from the score: downrank, challenge, review, or enforcement have different error costs.
Combine content, account, behavioral, graph, device, and temporal signals; build labels from reviewed cases while guarding against adversarial label contamination.
Use layered detection with cheap rules/features, learned models, confidence thresholds, and human escalation for high-impact or uncertain cases.
Monitor precision/recall by abuse slice, prevalence, reviewer disagreement, evasion patterns, latency, and enforcement reversals.
A useful interview mental model
This is the shape of a strong answer—not a script to memorize.
Senior-level signal
- Senior answers design for adaptive adversaries, policy versioning, and delayed/biased ground truth.
- Discuss graph-level coordinated behavior and safe rollback if a model suddenly changes enforcement rates.
What the interviewer is really testing
Likely follow-up questions
Common weak-answer patterns
- Jumping to a model before defining the product contract.
- Listing components without bottlenecks, metrics, or failure handling.
- Ignoring data quality, serving latency, monitoring, and iteration.