How we cut a client's cloud bill by 40% in six weeks

Cloud bills creep up quietly. A few oversized instances here, an idle environment there, and suddenly you're paying for capacity nobody uses. We were asked to review a client's AWS spend — and brought it down 40% without a single migration.

The first rule of cost optimization: you can't cut what you can't see. We started by tagging every resource and pushing the Cost and Usage Report into a dashboard the whole team could read.

The five biggest wins

• Right-sizing: 30% of instances were running at under 10% CPU. Downsizing them was free money.
• Savings Plans: committing to a baseline of compute cut on-demand rates by ~25%.
• Killing idle environments: staging ran 24/7 for a team that worked 9-to-5. We scheduled it off at night.
• Storage tiering: moving cold data to cheaper tiers saved thousands a month.
• Egress audit: one misconfigured service was paying cross-region transfer fees needlessly.

None of this required heroics. Cost optimization is a discipline, not a project — the savings hold only if you keep the dashboard in front of the team. We handed over a monthly review ritual so the bill stays honest.