Design Ad Frequency and Order Tracking

Company: Netflix

Role: Software Engineer

Category: System Design

Difficulty: medium

Interview Round: Onsite

Quick Answer: This question evaluates system-design competencies for building low-latency, high-throughput ad-platform components—specifically a real-time frequency-capping service and a direct-sold order tracking data model—focusing on distributed state management, idempotency, privacy-safe identifiers, concurrency control, and scalability.