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Marek Stepien is an experienced IT professional with a diverse background in database administration, system development, and network management. Currently serving as a Senior Developer, Senior DBA, and Systems Administrator at Call Handling Services since February 2016, Marek specializes in performance tuning of large MS SQL Server databases and overseeing various database frameworks including PostgreSQL and Cassandra in both on-premises and cloud environments. As a part-time IT Manager at Cherwell Valley Silos Ltd, Marek manages IT infrastructure and develops network solutions. Previous roles include Senior Database Developer at 1E, where Marek focused on SQL Server performance tuning, and a Senior MS SQL DBA at Capita PLC. Early career experience encompasses owning and operating multiple companies, providing IT consulting and electronic services. Marek holds a Master's degree in Mechatronics, Robotics, and Automation Engineering from the Technical University in Czestochowa.