Arnoldo Jose Cuellar Zaldana Business Intelligence Analyst | Data Analyst | SQL

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Data Analyst

Serfinsa S.A de C.V.

Jul 2025 - Current (1 year 2 months)

Key Achievement: Automated complex transactional and Excel reporting workflows using Python, reducing manual processing time by 90% and accelerating delivery times. • Leveraged Large Language Models (LLMs) to optimize SQL Server query logic, significantly cutting execution times for large-scale data extraction processes. • Designed and deployed strategic dashboards in Tableau and Power BI, enabling executive leadership to monitor real-time KPIs and streamline business decision-making. • Analyzed high-volume transactional behavior to identify usage trends, detect anomalies, and support operational decision-making.

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Data Visualization

Serfinsa S.A. de C.V.

Sep 2023 - Jun 2025 (1 year 10 months)

Key Achievement: Designed an executive Service Desk dashboard that integrated ticket resolution metrics, prioritizing critical incidents and improving Backoffice operational efficiency by 30%. • Developed interactive Tableau dashboards for C-level executives, transforming complex business requirements into intuitive data visualizations. • Generated comprehensive analytical reports covering transactional patterns, billing behavior, and customer usage trends to support financial planning.

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BI Analyst Jr.

GOMEZ LEE MARKETING

Mar 2023 - Aug 2023 (6 months)

• Built and maintained commercial analytics dashboards in Power BI for Whirlpool, tracking key performance metrics across multiple retail accounts. • Automated data ingestion and transformation workflows using Power Query, eliminating recurring manual reporting tasks. • Evaluated Sell-In / Sell-Out indicators to identify market gaps, optimize inventory distribution, and drive commercial strategies.

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Commercial Analyst

GOMEZ LEE MARKETING

May 2022 - Feb 2023 (10 months)

• Delivered commercial intelligence and reporting support for the Colgate-Palmolive account, analyzing point-ofsale data to identify growth opportunities. • Developed custom data visualizations and market studies to support trade marketing strategies and competitive analysis. • Maintained internal control dashboards, monitoring point-of-sale operations and compliance metrics across target markets.

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Analyst Intern

DGA

Mar 2021 - Feb 2022 (1 year)

• Validated and standardized large administrative datasets, ensuring data integrity and compliance for customs and logistics operations. • Optimized administrative logistics workflows by digitizing and structuring historical documentation into organized databases.

Arnoldo Jose Cuellar Zaldana

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