Mustapha Afeez

I’m a detail-driven data cleaner and analyst who turns messy spreadsheets into organized, reliable outputs. I focus on accuracy through repeatable cleaning steps, validation, and clear reporting that others can act on.

In my Sales Data Cleaning & Analysis project, I cleaned a raw sales dataset with 1,000+ rows containing missing values and duplicate entries. I standardized data using Excel functions like TRIM, REMOVE DUPLICATES, and IFERROR, then summarized results with PivotTables and visualized top-performing products with a bar chart.

For Student Grade Analysis, I structured mock exam records in Excel and linked student IDs to scores using VLOOKUP. I used RANK to sort performance and COUNTIF to track passes/fails, then built a simple chart-based dashboard for quick interpretation.

I also created an Inventory Tracking System in Excel to help monitor stock levels, reorder points, and suppliers. Using SUMIF, I calculated total stock per category and applied conditional formatting to highlight low-stock items, reinforcing my commitment to problem solving and time management.