Design a News Feed
Master the architecture behind Facebook, Twitter, and LinkedIn feeds from fan-out strategies and ranking to realtime delivery at scale.
What You Will Learn
Break Design a News Feed into core user flows, write paths, read paths, and offline/background work.
Model the dominant data entities, indexing strategy, and hot-path caches before tuning secondary features.
Identify where realtime updates, fan-out, ranking, or matching logic becomes the main scaling constraint.
Plan abuse prevention, reconciliation, and operational visibility alongside the happy path.
Key Decisions
What is the dominant read/write path that makes Design a News Feed hard at scale?
Where do you need async boundaries, queues, or precomputation instead of synchronous work?
Which data becomes hottest first, and how do you partition or cache it safely?
What correctness risks remain after the first scalable design is in place?
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