AWS cost audit: our bill doubled in six months and we need to know why

January's AWS bill was $4,100; July's was $8,700, and our traffic grew maybe 30% in that window. Something is off and nobody internally has had time to dig. We run a fairly standard stack: ECS services, RDS, S3, CloudFront, a handful of Lambda functions and an OpenSearch cluster someone set up for a feature we later cancelled. We want a one-week focused audit: go through Cost Explorer and CUR data, identify what is actually driving the growth, flag orphaned resources, and deliver a prioritized savings report - each item with estimated monthly saving, implementation effort, and risk. Where the fix is trivial (unattached volumes, oversized dev instances) and we approve it in writing, apply it during the engagement. Read-only billing and infrastructure access from day one, a 30-minute kickoff, then a findings walkthrough at the end. If the report is good, there is follow-up implementation work in September.