AWS Billing Unbilled Usage Auditor
·276 words·2 mins
Designed and built a distributed system that detects unbilled usage across all AWS services — reducing charge discrepancies by 300x and eliminating 230 million monthly false positives. Key Metrics # 300x Reduction in Discrepancies $125,000 → $432 230M False Positives Eliminated ~95% Alert Actionability Architecture # flowchart LR A["Usage Records\n(Billions/day)"] --> B["Smart Sampling\n& Aggregation"] B --> C["Multi-Signal\nValidation"] C --> D["Automated\nResolution"] D --> E{Real issue?} E -- Yes --> F["Alert with\nDiagnosis"] E -- No --> G["Auto-resolve\n& Log"] style B fill:#6366f1,color:#fff style C fill:#6366f1,color:#fff style D fill:#6366f1,color:#fff Technical Deep Dive # Aggregation over Brute-Force # Instead of checking every individual usage record (which generated 230M false positives), the system aggregates at the service-account-period level.