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Legacy System Migration (Excel to Power BI)

I specialize in the high-stakes transition of mission-critical Excel models into enterprise-grade Power BI ecosystems. I solve the 'Fragility Gap' that occurs when businesses outgrow their legacy spreadsheets. By implementing robust Data Modeling and automated ETL pipelines, I eliminate the risks of version control issues and human error. My goal is to transform your static historical files into proactive intelligence, allowing your team to spend 90% of their time on strategy and 0% on manual data manipulation.

Service Package

Contact me for pricing

Skills

Relational Data Modeling (Star Schema)Parallel Validation Testing

Roles

BI Migration ArchitectAnalytics EngineerData Governance SpecialistETL Developer

Tools

Power BI Service & DesktopPower Query (M Language)DAX (Data Analysis Expressions)
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What You Can Expect

Technical Migration Roadmap

A comprehensive audit of your legacy Excel logic and a detailed step-by-step plan for the transition to Power BI.

Validated Power BI Enterprise Model

A high-performance, Star Schema data model with all legacy Excel formulas re-engineered into optimized DAX measures.

Parallel Testing & Audit Report

A detailed data parity report confirming that the new Power BI system matches your legacy Excel "Source of Truth" to the penny.

Process

1. Legacy Audit: Identifying nested logic, macros, and data dependencies within your current Excel files. 2. Architecture Re-Design: Transforming "flat" Excel tables into a professional Star Schema for maximum performance. 3. DAX Engineering: Re-coding complex Excel formulas into transparent, scalable DAX measures. 3. UAT & Parallel Validation: Running the old and new systems side-by-side to ensure 100% data integrity. 4. Governance & Deployment: Setting up security roles, workspace permissions, and automated refresh schedules.

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Frequently Asked Questions

Technologies & Tools

Power BI Service & Desktop
Power Query (M Language)
DAX (Data Analysis Expressions)
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