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John Madden is a Senior Data Scientist at CJ, where responsibilities include collaborating with global teams to develop Tableau dashboards for over 4,500 clients and utilizing Databricks, Spark SQL, Spark Scala, PySpark, and Python for data analysis and algorithm implementation. Prior experience includes roles as a Data Scientist at Monarch Casino Black Hawk, where John created SQL scripts and Power BI dashboards, and as a Marketing Coordinator Intern at Mike's Hard Lemonade, where John analyzed large datasets to derive insights. John also worked as a Point of Sales Coordinator at Madden Communications, managing promotional orders and enhancing communication across departments and clients. Academic achievements include a Master of Science in Data Analytics and a Bachelor's Degree in Business Marketing from the University of Colorado Boulder.