FinOps for SREs: Cutting Costs Without Breaking Things

FinOps for SREs: Cutting Costs Without Breaking Things Tags: aws finops sre reliability devops Most FinOps advice starts with a cost dashboard. This series starts with a different question: how do we cut costs without violating our SLOs? I'm an SRE at a subsidiary of one of Korea's largest tech companies, managing four AWS accounts connected via a Transit Gateway hub-spoke architecture. When I was asked to reduce cloud spend, I didn't open AWS Cost Explorer first. I opened our SigNoz dashboards and checked our error budgets. That's the difference between FinOps and SRE-driven FinOps. The SRE Guarantee Before any cost optimization begins, I guarantee three things: 1. Error Budget Protection No optimization will be executed if it risks breaching SLOs. If our error budget is below 50%, all FinOps work stops — reliability comes first. 2. Assured Minimum Downtime Every change has a rollback plan, a maintenance window, and a blast radius assessment. Zero-downtime is the target. Documented, b