System Design

System design lessons for interviews and for production: tradeoffs, scaling, consistency, and reliability.

System Design Daily

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One system design lesson at a time.

From the AI Wall

Most system design interviews reward the same five moves. Practice the structure so nerves do not scramble it.

Fairness, quotas, and multi-region consistency for a rate limiter that holds up in interviews and in production.

A short note on module boundaries: coupling, ownership, and decisions you will not regret.

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