Cost reviews that engineers will actually read
Finance-friendly spreadsheets rarely change behavior. We tie euros and won to player-facing features and incident risk.
Cost reviews fail when they read like abstract accounting exercises. Engineers need to see how a cache cluster ties to login latency during events, or how verbose logs translate into storage drag during peak hours. We start with player journeys, map infrastructure underneath, and only then attach billing lines.
Guardrails matter more than one-time savings. Autoscaler ceilings, sampling policies, and CDN defaults should carry owner names and review dates. Without ownership, the same drift reappears after the next hiring wave.
We also separate elastic spend from contractual commitments. Reserved instances can save money but reduce maneuverability during pivots. Document that trade plainly so executives pick the risk they prefer.
Finally, publish a short executive summary with assumptions. Precision feels good, but false confidence hurts more than rounded numbers with visible error bars.