Alejandro Romero

I’m a results-driven data analyst with more than 2 years of experience delivering analytical solutions using Power BI, SQL Server, and the Microsoft Power Platform. I specialize in automating data extraction, harmonizing multiple data sources, and building interactive dashboards that speed up decisions and improve performance.

In my current Senior Data Analyst role at Nissei, I redesigned data models into a star schema architecture, cutting ETL processing time from 1 hour to 3 minutes (−95%). I also developed real-time dashboards using DirectQuery for high-impact campaigns, and I’ve worked to optimize semantic models and Power BI performance so users can analyze faster with better experiences.

Previously at PwC Paraguay, I delivered automation and analytics solutions for internal and client reporting. Using Power Query, Excel VBA, Python scripts, and Power BI, I streamlined repetitive data transformation work and reduced dashboard errors by 30% through improved Power Query workflows—while collaborating with finance and audit teams to standardize data collection and quality control.

Before that, I created and maintained 15+ interactive Power BI dashboards for e-commerce, customer service, and store operations at Nissei, including a real-time online sales dashboard that increased monthly revenue by 18%. I’ve also built forecasting models with Prophet to support cross-border growth (+30%) and used KPI visualization to reduce customer service response time by 20%, and I’ve contributed through Power Apps (including a document management solution that reduced data entry errors by 90%).