I clean and reconcile Excel or CSV data, repair formulas, build traceable summaries and dashboards, preserve raw and source data, flag exceptions, and provide refresh and handoff notes. The first milestone uses a representative sample with exact row, file, KPI, and software-version limits. Delivery includes a cleaned workbook, formulas or query steps, reconciliation checks, an exceptions log, and a clear explanation of how to refresh or extend the result. AI-assisted tools may support the work, but I review and test the final output.