Homepage Video Recommendation System

Open ML-system-design prompt: recommend videos for the Netflix home page. Reported rounds skew toward high-level service architecture (how many services, how they talk) over feature engineering / modeling / evaluation. The Challenge Design a system to recommend videos for the Netflix home page. Architecture Focus This variant stays mostly at the service-architecture level: define the major services and how they communicate, rather than going deep on feature engineering, model training, or offline evaluation. A strong answer usually separates candidate generation, ranking, serving, caching, and feedback ingestion. Clarify whether the prompt wants an ML-system-design treatment or a product-serving architecture treatment before spending time on model internals.