Driving a Cost Optimization Initiative

Question

Give an example of how you identified cloud cost waste and optimized it. What was the impact?

Accepted Answer

Certainly. Identifying and optimizing cloud cost waste is a continuous effort that involves both technical analysis and effective collaboration. A recent example involved a critical application where we proactively identified significant over-provisioning. I utilized AWS Cost Explorer and applied custom tags to categorize spending by application, environment, and team. This granular view immediately highlighted a specific microservice within our production environment that was consistently consuming a disproportionately high amount of compute resources, even during periods of low user traffic. Once the waste was identified, I partnered with the engineering lead responsible for that microservice. We scheduled a meeting to review the Cost Explorer data, transparently explaining the cost implications and collaborating on a plan to address the over-provisioning without impacting performance or availability. The primary optimization strategy we implemented was rightsizing. By analyzing historical CPU and memory utilization metrics using CloudWatch, we determined that the instances supporting this microservice were significantly over-provisioned. We then systematically reduced the instance types to match the actual demand, which was a much smaller footprint. The impact was substantial. Within the first month of implementing the rightsizing, we achieved a recurring monthly savings of approximately 35% for that specific microservice's compute costs, which translated to over $5,000 in annualized savings. This also freed up valuable resources that could be reallocated to other projects. Following the optimization, we implemented enhanced monitoring and alerting on key performance indicators and cost metrics for this service. This proactive approach allows us to quickly detect any future anomalies and maintain our cost-optimization efforts, ensuring we continue to deliver value efficiently.

Driving a Cost Optimization Initiative

Ready to prove your AWS architecture knowledge?

Cloud Service Models

Purpose of Terraform State

Cloud Shared Responsibility Model

Kubernetes Ingress vs Service

AWS vs Azure vs GCP

Cost-Aware SRE: FinOps Practices Without Sacrificing Reliability

Aurora vs RDS PostgreSQL vs EC2: Costs, Performance & Multi-Region Compared (2025)

GitHub Self-Hosted Runners on AWS: Pull vs Push for On-Demand Scaling