Design a marketplace price tracking service

Q: Design a marketplace price tracking service

This question evaluates a candidate's ability to design scalable, reliable ingestion and processing pipelines, time-series price storage and querying, deduplication across users, and notification/alert mechanisms for a large-scale price-tracking service.

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Question

Design a large-scale product price tracking service similar to an e-commerce price monitor. Users can submit product links from a major online marketplace, view historical price changes, and receive alerts when a product drops below a target price.

Your design should address:

Product URL ingestion and canonicalization
Periodic price collection for millions of tracked products
Historical price storage and visualization
User-defined alert thresholds and notifications
Deduplication when many users track the same product
Freshness, scalability, reliability, and operational constraints

Design a marketplace price tracking service

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