Blue Green Deployment

This handles the infrastructure setup for running two identical production environments and switching traffic between them, typically through load balancers or DNS. You'd reach for this when you need true zero-downtime deployments or want instant rollback without redeploying anything. The skill includes scripts for traffic switching with AWS ALB target groups and rollback automation. It's overkill for simple apps but makes sense for high-stakes releases where you need that safety net of keeping the old environment warm and ready. The main trade-off is running double the infrastructure during deployments, which can get expensive if your transition windows are long.