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Derar Alhussein is an experienced data professional with a diverse background in data engineering, analysis, and training. Currently serving as an Online Instructor at Udemy, Derar has positively impacted over 50,000 data engineers through Databricks certification courses. At O'Reilly, Derar is an author and trainer, contributing to the "Databricks Certified Data Engineer Associate Study Guide" and conducting live training sessions. As a Senior Data Engineer at Cegid, Derar specializes in architecting and implementing data projects using Spark and Python on Azure Databricks. Previous roles include Senior BI Engineer and Data Analyst, with experience developing ETL workflows, BI dashboards, and databases. Derar's early career includes positions at Amazon France as a Data Analyst and MTN as a CRM Developer. Academically, Derar holds a Master in Data Mining and Knowledge Management from Université Lumière Lyon 2 and an Erasmus Mundus Master in Data Mining and Knowledge Management from Polytech Nantes.