Design a feed app similar to Twitter | Dataford Interview Questions

Your question is Design a feed app similar to Twitter. Take a moment with it on the right.

Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).

Problem

Design a feed app similar to Twitter

This practical interview question asks you to design the end-to-end ML system that selects and orders posts in a personalized feed. The prompt does not specify product scale, so clarify assumptions before designing.

Address:

Functional goals, engagement objectives, and safety or diversity constraints.
Traffic, catalog, candidate volume, storage, and latency estimates.
Candidate generation, ranking, and any re-ranking stages.
Online serving, batch processing, feature storage, and fallbacks.
Offline and online evaluation, including experiment guardrails.
Training-serving skew, feature drift, cold start, and monitoring.

Keep the design practical and explain tradeoffs between relevance, freshness, cost, and latency.

Your question is Design a feed app similar to Twitter. Take a moment with it on the right.

Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).

Design a feed app similar to Twitter

Address:

Functional goals, engagement objectives, and safety or diversity constraints.
Traffic, catalog, candidate volume, storage, and latency estimates.
Candidate generation, ranking, and any re-ranking stages.
Online serving, batch processing, feature storage, and fallbacks.
Offline and online evaluation, including experiment guardrails.
Training-serving skew, feature drift, cold start, and monitoring.

Keep the design practical and explain tradeoffs between relevance, freshness, cost, and latency.