Design a harmful video content moderation system

Question

Design an end-to-end system to detect and moderate harmful videos on a large platform.

Requirements

• Detect multiple policy categories (violence, self-harm, hate, sexual content, etc.).
• Operate at upload time and for already-published content.
• Combine automated decisions with human review.
• Minimize both false negatives (missed harmful content) and false positives (wrongful removals).
• Provide appeals and auditability.

Deliverables

Architecture, model strategy (multi-modal), labeling/review workflow, metrics, and how you handle adversarial evasion.