AWS monolithic service marketplace combining Next.js backoffice, React Native mobile app, and Node.js backend serving payment processing and notifications through a multi-tier VPC architecture. Client requests route through CloudFront CDN and AWS WAF to an Application Load Balancer, which distributes traffic across auto-scaled EC2 t3.large instances running the Node.js monolith handling authentication, business logic, and APIs. The monolith publishes events to SNS, triggering Lambda workers via SQS queues for asynchronous notifications and payment processing, while persisting data across MongoDB, RDS PostgreSQL, and ElastiCache with centralized monitoring via CloudWatch. This architecture demonstrates how to balance monolithic simplicity with event-driven asynchrony, leveraging AWS managed services for security, caching, and observability. Fork and customize this diagram on Diagrams.so to adapt subnet sizing, instance types, or database configurations for your marketplace scale. Consider future microservices migration by decoupling domain boundaries at the SQS/SNS layer.