System design patterns

Pattern-first interview preparation

Learn how to recognize and solve system design problems through reusable architecture patterns, decision frameworks, and production-grade tradeoffs.

1

Feed / Timeline

Hard

Design a low-latency, personalized timeline that remains stable under celebrity spikes, ranking pressure, and failure recovery.

Examples: Instagram Home, X/Twitter Timeline, LinkedIn Feed

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2

Messaging / Chat

Hard

Design a reliable, low-latency chat system with ordering guarantees, delivery states, and real-time fan-out across devices.

Examples: WhatsApp, Slack Channels, Telegram

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3

Search

Hard

Design a fast, relevant search experience that remains accurate under high write churn, ranking complexity, and index lag.

Examples: Google Web Search, Amazon Product Search, YouTube Search

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