Designing High-Availability Identity Systems Processing Billions of API Calls

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Explore how high-availability identity systems handle billions of API calls with scalable architecture, resilience, security, and reliability.
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Modern enterprises depend on identity systems that can authenticate billions of users and API requests without downtime. This article explores the architecture behind highly available identity platforms, covering distributed systems, fault tolerance, scalability strategies, security controls, and performance optimization techniques that enable seamless authentication at global scale.