Mahalakshmi

Data Analyst

Upwork • Freelance

Dec 2025 - May 2026 • 5 mos

I work as a freelance data analyst providing Excel data cleaning, data validation, and reporting services. I help clients transform raw and messy datasets into clean, structured, and analysis-ready formats. My work includes removing duplicates, handling missing values, standardizing data, and ensuring data accuracy. I also create Excel reports and summaries to support business decision-making.

Data Analsyt

Trimble • Tiempo completo

Oct 2024 - Dec 2025 • 1 yr 2 mos

• Designed star schema data models and optimized relational databases to enable scalable and high-performance analytical reporting • Developed SQL queries (Joins, CTEs, Window Functions, Subqueries) to extract, transform, and analyze large datasets • Performed data cleaning, transformation, and preparation using Advanced Excel, Power Query and Tableau Prep • Developed calculated columns and advanced DAX measures to power dynamic KPI dashboards and performance monitoring • Developed and maintained data visualizations and interactive dashboards using Advanced Excel, Power BI and Tableau, identifying trends, patterns, and key insights through exploratory data analysis • Converted raw and unstructured data into meaningful, easy-to-understand reports for stakeholders • Led data quality assurance and data validation for 1,500+ unstructured datasets, achieving 98% data accuracy • Supported Machine Learning workflows through data cleaning and preparation of high-precision labeled datasets, improving model accuracy to 96% • Improved data standardization guidelines to enhance model reliability and reporting consistency • Conducted demand forecasting, workload analysis, and Excel-based reporting for BI planning and capacity optimization • Performed root cause analysis on data discrepancies and implemented corrective controls to strengthen data governance and reporting accuracy