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I will clean, deduplicate excel and CSV data for power bi and sqlite
Data Engineer, SQL and Relational Database Normalization
I specialize in relational database design, legacy data normalization, and financial ledger reconciliation across healthcare, fintech, and SaaS domains.
I transform flat, unstructured spreadsheets an...
About this Gig
Messy spreadsheets with duplicate rows, broken formulas, and mismatched data types crash Power BI and ruin analytics.
I convert chaotic spreadsheets and raw CSVs into two synchronized, production-grade assets:
1. Clean multi-sheet Excel workbook (.xlsx) ready for instant Power BI & Tableau reporting.
2. Institutional 3NF SQLite database (.sqlite) with a complete relational schema (.sql) for fast SQL querying.
WHAT IS AUDITED & CLEANED:
Deduplication: True unique entities identified and merged without data loss.
Formula & Grid Health: 0 broken formula references (#REF!, #DIV/0!, #VALUE!) and 0 merged cells in data ranges.
Whitespace & Encoding: Strip leading/trailing spaces, non-breaking spaces (\xa0), and control characters.
Identifier Safety: Phone numbers, ZIPs, and IDs protected from scientific notation corruption (1.23E+11).
Date Standardization: 100% ISO-8601 (YYYY-MM-DD) compliance across all temporal columns.
Financial Reconciliation: Numeric totals and balances match to the exact penny ($0.00 drift).
Zero-Trust Privacy Airlock: Data is tokenized locally on an isolated offline machine. Zero PII ever leaves my system.
My Portfolio
FAQ
How is my confidential business data protected?
I operate an offline Zero-Trust Privacy Airlock. Before processing, all sensitive PII (names, emails, accounts) is tokenized into cryptographic dummy tokens locally. Your raw data never touches external servers.
Can I load the Excel sheets directly into Power BI?
Yes. Data grids contain zero merged cells, zero embedded blank rows, uniform column datatypes, and standard ISO-8601 dates (YYYY-MM-DD), ensuring instant, error-free Power BI and Tableau ingestion.
How do you guarantee no numbers or rows were lost?
Every package is audited with an automated 8-suite cross-reconciliation harness. It verifies exact row parity (0 delta) and calculates mathematical SUM() totals across SQLite and Excel down to the penny ($0.00 delta).
