Manual and functional QA portfolio demonstrating test case design, regression testing, bug reporting, UAT support, SQL/data validation thinking, and end-to-end workflow validation.

UAT regression framework for billing system upgrades. Tolerance-aware diffing of pre/post-upgrade report extracts: 100% catch rate measured against 1,299 planted regressions across 7 classes, zero false alarms on a benign-only control, 1M rows in 67s, and a formatted Excel sign-off evidence workbook as the first-class artifact.