Availability

A team deploys their application to three regions, each with its own app tier, database, and network path. On paper, a failure in one region should never touch …

A checkout API runs three replicas across two availability zones behind a load balancer — on paper, no single point of failure. Then one AZ has a networking inc…

An order API can return responses all day and still charge the wrong amount. It can be temporarily unreachable while every stored order remains safe. It can fai…