Designing a Reactive, Event-Driven Email OTP Login System with CQRS and Event Sourcing
Modern authentication systems are moving beyond passwords. With the rise of passwordless authentication, One-Time Passwords (OTPs) delivered over email or SMS are becoming a trusted standard for secure and seamless user logins. However, implementing an OTP-based login mechanism that is scalable, reactive, and audit-compliant requires more than a simple verification