Multi-tenant movie ticket booking platform on AWS using EKS with Istio service mesh for secure inter-service communication and tenant isolation. Client requests flow through Route 53, AWS WAF, and Application Load Balancer to an Istio Ingress Gateway, then to 12 microservices (Authentication, Booking, Payment, Notification, Analytics, etc.) running in EKS with mTLS, circuit breakers, and canary deployments. Data persists in RDS PostgreSQL Multi-AZ, Redis Cache, Apache Kafka MSK for events, and S3 for reports with cross-region replication and automated backups. DevSecOps pipeline integrates AWS CodeCommit, Jenkins, SonarQube, OWASP ZAP, and ECR; observability spans OpenTelemetry, Fluent Bit, ELK, Prometheus, and Grafana. This architecture demonstrates enterprise-grade multi-tenancy with zero-trust networking, automated disaster recovery via Route 53 failover, and compliance-ready audit trails. Fork and customize this diagram on Diagrams.so to adapt tenant isolation policies, add additional microservices, or modify data layer topology for your SaaS requirements.