How does Twilio run 99.999% systems?
summary
Justin Kitagawa describes how Twilio achieves 99.999% uptime by treating core components as Tier 0 services and designing for failure through redundancy, small incremental deployments, and blast-radius reduction. He outlines operational practices—assume-failure frameworks, human-error minimization, and traffic-shifting techniques—illustrated with examples from Twilio’s large-scale, mission-critical platform.
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