
AsimChakraborty
Data Analyst for Excel SQL Python and Power BI
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Data Analyst
Self Employed • Freelance
Jan 2026 - Present • 10 mos
I specialize in transforming raw datasets into structured, reliable, and actionable business insights through data analysis, business intelligence, and visualization. My experience includes developing end-to-end analytics projects involving data cleaning, SQL analysis, Python-based data processing, and interactive Power BI dashboards. Key Responsibilities and Project Experience • Cleaned, transformed, and validated large datasets using Microsoft Excel, Power Query, and Python. • Extracted, analyzed, and organized business data using PostgreSQL, SQL queries, joins, CTEs, and window functions. • Developed interactive Power BI dashboards with KPI tracking, data modeling, and DAX calculations. • Conducted sales and profitability analysis to identify revenue patterns, margin performance, and business opportunities. • Performed customer cohort analysis to evaluate retention patterns and customer behavior. • Analyzed transactional data to identify fraud patterns, suspicious activities, and potential risk indicators. • Created analytical visualizations using Python libraries, including Pandas, NumPy, and Matplotlib. • Documented analytical findings, validated calculations, and translated results into practical business recommendations. Tools and Technologies Microsoft Excel | Power Query | PostgreSQL | SQL | Python | Pandas | NumPy | Matplotlib | Power BI | DAX My approach focuses on understanding business requirements, ensuring data accuracy, selecting appropriate analytical methods, and delivering clear, well-documented results. I aim to help businesses make informed decisions through reliable analysis, meaningful reporting, and effective data visualization.