System Design Study
News Feed Application
Design the frontend architecture of a high-performance News Feed application (like Facebook or Instagram). Focus on item lifecycle, media lazy-loading, and local store consistency.
Step Budget5:00
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✨ Senior Evaluator Notes
High-grade candidates discuss normalized data structures to avoid double-updates when changing user parameters.
⚠️ Common Pitfalls
- Keeping thousands of items in memory without garbage-collecting off-screen cards.
- Not normalizing data (leading to inconsistencies when updating likes or comments on the same post shown elsewhere).