Serverless FinOps: Automated Cost Reporting on AWS

Cost management is a pillar of well-architected cloud systems. To give our team better visibility into our AWS spend, I designed a serverless monitoring workflow.

The Architecture

We built a highly efficient, event-driven system:

• EventBridge Scheduler: Triggers the workflow daily and monthly.
• AWS Lambda (Python): Queries the AWS Cost Explorer API and aggregates data by service and account.
• Amazon SES: Delivers beautiful, actionable HTML reports directly to stakeholders’ inboxes.

Security and Connectivity

To maintain our strict security posture, the entire workflow operates within our VPC, utilizing AWS PrivateLink to interact with telemetry services securely without traversing the public internet.

Impact

This automation has saved our operations team hours of manual work and provided the business with the data needed to make informed scaling decisions.