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Evaluate impact of short videos in feed

MetaData Engineer · Onsite
HardData EngineerOnsiteSystem Design

Last updated

This question evaluates competency in metrics definition, causal experimentation, product analytics, and feed system behavior within the System Design and Data Engineering domain.

Scenario

You work on a social app’s main News Feed. The team wants to introduce a short-form video module ("Reels") into the feed.

Prompt

  1. How would you determine whether adding Reels to the News Feed is successful?
  2. What metrics would you define (primary + secondary/guardrails)?
  3. How would you design an experiment / launch plan to measure impact?

Notes / Assumptions

  • The feed currently contains mixed content (text, images, long videos, links).
  • Reels may affect both consumption (viewing) and distribution (other content getting less exposure).
  • You have standard event logging for impressions, clicks, watch time, likes, comments, shares, hides, follows, etc.