Hire Tableau Developer — precise dashboards, engineered extracts

Neither universally. Tableau leads on visual flexibility and analyst experience; Power BI on Microsoft integration and licensing cost. I work in both — the right choice follows your existing stack and how your team actually works.

Level-of-detail expressions computing aggregations at a granularity independent of the view — like average order value per customer inside a regional dashboard. They solve problems table calculations can’t, but misuse creates subtle errors I clean up.

Usually extracts refreshing full tables nightly, unfiltered live connections, or calculations iterating over millions of rows. I profile the workbook, fix the structure, and typically cut load times from minutes to seconds.

Yes, with eyes open. I audit what translates cleanly — most calculations do — and what needs redesign, then rebuild with validated numbers. Migrations are also the right moment to fix years of accumulated workbook debt.

Projects with clear ownership, permission groups mapped to roles, certified data sources, and refresh schedules that don’t collide. Governance stays light enough that analysts keep building — just on trusted foundations.