HardAI Evaluated

Design a Social Network Feed

Overview

Design a scalable social platform where millions of users post updates, follow accounts, and load a personalized reverse-chronological timeline in real time with low latency.

Requirements

1Users can post text/media tweets (<280 chars) and follow/unfollow other users
2Generate and deliver user home feeds in <200ms for 300M daily active users
3Handle high-fanout celebrity accounts with 50M+ followers (prevent write amplification bottlenecks)
4High availability (99.99%) with eventual consistency for feed reads
5Support pagination (infinite scrolling) and trending topics ranking

Architecture Hints (4)

Target Concepts

#Fanout Service#Redis ZSET#Kafka#Graph DB#Timeline

Canvas Editor

Design a Social Network Feed

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