Commenting System for Articles

HardSystem Design00:00

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Problem

System design: how would you add comments to articles?

Asked in the Karat - system design (20 min) stage. Treat this as a practical design exercise. Clarify the product, scale, latency, moderation, ranking, and compliance assumptions before proposing an architecture.

Address:

Comment creation, retrieval, pagination, editing, deletion, and reporting.
ML-based abuse, spam, toxicity, and relevance handling.
Candidate generation, ranking, and policy-based re-ranking where appropriate.
Online versus batch processing, storage, APIs, and caching.
Offline and online evaluation, monitoring, drift, and failure recovery.