Multi-AZ employee information management system deployed across Tokyo region (ap-northeast-1) with Route 53 DNS, Application Load Balancer, and Auto Scaling EC2 instances. Traffic flows from users through Route 53 and Internet Gateway to ALB, which distributes requests to t3.medium EC2 instances across two availability zones with independent NAT Gateways. Application tier connects to RDS Primary (db.r5.large) in AZ-1 and RDS Standby in AZ-3 for high availability, with synchronous replication ensuring data consistency. Static assets and documents are stored in S3 with versioning and Object Lock for compliance and disaster recovery. This architecture demonstrates AWS best practices for regional resilience, automated scaling, and secure data management for enterprise employee systems.