Cloud Cost Optimization Lab (Interactive)
Flip Spot share, Graviton, Glacier lifecycle, and AZ-affinity routing against a live monthly bill with four line-item deltas. Recompute compute, storage, cross-AZ, and internet-egress costs from architectural toggles and measure savings against the naive baseline.
FinOps Architecture Cost Lever Board
Toggle the four levers — Spot, Graviton, lifecycle tiering, egress elimination — and watch the bill recompute.
How It Works Under the Hood
Cloud bills are architecture artifacts, not operations artifacts. Over-provisioned compute at 15% CPU utilization is half the spend; Spot fleets discount stateless capacity 70-90% and Graviton ARM64 adds roughly 40% price-performance for a drop-in rebuild. Storage left in S3 Standard costs $23,000/month per petabyte versus $990 in Glacier Deep Archive — a 95.7% lifecycle saving. The silent killer is network: $0.02/GB cross-AZ east-west tax and $0.09/GB internet egress make topology-aware routing, free VPC Gateway Endpoints, and CDN offload architectural decisions, not billing cleanup.
Core Architectural Principles
- S3 lifecycle rules move cold bytes from $0.023 to $0.00099/GB/month, saving ~$264k/year per petabyte.
- AZ-affinity routing keeps RPC inside one zone, eliminating the $0.02/GB cross-AZ roundtrip tax.
- Spot on stateless pods is a 70-90% discount priced in 2-minute preemption notices and retry logic.
Volunteer cost levers in every design: lifecycle policies for media, Spot for stateless tiers, VPC endpoints instead of NAT for S3 calls, and a CDN in front of origin egress. Quantifying one of them — a 95% tiering saving — reframes you as the engineer who ships to production, not just to whiteboard.
Every FinOps lever buys dollars with a constraint — Deep Archive's 12-hour retrieval, Spot's preemption storms, Graviton's rebuild — so pair savings with the SLA risk you are accepting.