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SeanW-Data/README.md

Hi, Iโ€™m Sean ๐Ÿ‘‹

Junior Data Analyst | Power BI | SQL | Reporting & Performance Analytics


About Me

Iโ€™m a Junior Data Analyst focused on transforming business data into clear, actionable insights. I specialise in Power BI dashboard development and SQL-based exploratory data analysis, with an emphasis on performance reporting, KPI tracking, and commercial decision support.

My experience includes building end-to-end reporting workflows โ€” from data cleaning and modelling (Power Query, star schema design) through to DAX measure development and executive-ready dashboards. Iโ€™ve worked with structured datasets ranging from 10kโ€“100k+ records to analyse revenue performance, customer behaviour, and operational trends.

Before transitioning into analytics, I ran my own business for several years, using structured KPI tracking, forecasting, and performance analysis to drive approximately 20% year-on-year profit growth. This commercial foundation shapes the way I approach analytics โ€” practical, outcome-focused, and aligned with real business objectives.


Key Projects

๐Ÿ“Š Retail Performance Dashboard (Power BI)

  • Designed a star-schema data model and transformed data using Power Query
  • Developed DAX measures for revenue, margin, and YoY/MoM trend analysis
  • Built an interactive KPI dashboard to analyse performance drivers

๐Ÿ’ณ Fintech Revenue & Customer Analysis (SQL)

  • Performed exploratory data analysis using PostgreSQL
  • Utilised JOINs, CTEs, aggregations, subqueries, and window functions
  • Identified revenue concentration patterns and high-value customer segments
  • Structured analysis to simulate real-world financial performance reporting

Technical Stack

  • Power BI (DAX, Power Query, Data Modelling)
  • SQL (PostgreSQL โ€“ JOINs, CTEs, Window Functions)
  • Microsoft Excel (KPI tracking, forecasting)
  • Python (pandas, matplotlib โ€“ developing)

Open to Junior Data Analyst, MI Analyst, and Reporting Analyst opportunities.

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  1. interiva-furniture-powerbi-analytics interiva-furniture-powerbi-analytics Public

    End-to-end Power BI analytics project completed as part of a college assessment, analysing a fictional UK furniture retailer.

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  2. sql-exploratory-data-analysis sql-exploratory-data-analysis Public

    Exploratory data analysis of a fictional tech business using PostgreSQL, focusing on revenue performance, customer segmentation, seasonality, churn, and pricing anomalies.

    1

  3. college-performance-powerbi-dashboard college-performance-powerbi-dashboard Public

    End-to-end Power BI analytics project completed as part of a college data analytics course. The project analyses student performance and engagement for a fictional college, using structured data moโ€ฆ

    1