ConceptViz is a full-stack AWS architecture for a collaborative diagram editor combining React frontend, Node.js Express APIs, and AI-powered services across four isolated VLANs. Traffic flows from users through Route 53 DNS and CloudFront CDN to a WAF and Shield-protected ALB, routing requests to Cognito-authenticated frontend and API Gateway backends. The AI services layer orchestrates Lambda functions, OpenAI integrations, and SageMaker custom models, while the data layer persists to MongoDB replica sets, Redis caching, and S3 storage with Glacier backups. This architecture demonstrates enterprise-grade security with KMS encryption, Secrets Manager, and comprehensive observability via CloudWatch, X-Ray, and GuardDuty. Fork and customize this diagram on Diagrams.so to adapt the VLAN segmentation, scaling policies, or AI service integrations for your SaaS platform.