Kefalas Nikolaos
Nikolaos Kefalas is a Senior Manager in Analytics and Data Engineering, based in Thessaloniki, Greece. He holds an integrated Master’s degree in Information & Communication Systems Engineering from the University of the Aegean, and brings deep cross-industry expertise spanning financial services and pharmaceuticals — with leadership roles at globally recognized organizations including Pfizer, Accenture, and EY (Ernst & Young). At Pfizer, he leads cross-functional teams across data governance, ETL development, business intelligence, and agile delivery. His contributions include the design and migration of data marts, the implementation of data quality engines, and the standardization of real-world data assets. He has played a significant role in regulatory submissions and large-scale data integrations, demonstrating a consistent ability to deliver complex, compliance-critical initiatives on a global scale. A certified Scrum Product Owner and ScrumMaster, Nikolaos combines strategic oversight with hands-on technical depth. His expertise spans programming languages (Java, C, C++, Python), database platforms (Snowflake, Redshift, SQL, PL/SQL), reporting tools (Power BI, Tableau, SSAS, SSRS), ETL platforms (SSIS, Informatica, Talend, Dataiku DSS), and cloud technologies (AWS). He is recognized for optimizing data pipelines, ensuring regulatory compliance, and driving innovation in data strategy and quality across international teams.