C3 BOTH 18 min · Common Patterns
Idempotency & exactly-once semantics idempotency, exactly-once, dedup
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E5
SLOs, error budgets & the reliability org
Design an in-memory key-value store 35 min
T4 Expert 7 Design a multi-region active-active system 60 min Design a distributed job scheduler 55 min Design a real-time analytics pipeline 60 min Design an ad-serving / bidding platform 60 min Design a globally distributed database 60 min Design a platform-scale distributed rate limiter 55 min Critique: find the failure modes in a given design 45 min NEXT · C4 Sagas, 2PC & distributed transactions
C3 · Idempotency & exactly-once semantics — System Design