Christos Zarogiannis

• Engineered ETL processes and applications to support seamless scalable data integration across multiple platforms.
• Optimized SQL query, stored procedure, and function performance via focused tuning efforts to improve efficiency, maintainability, and reliable database performance.
• Completed QA testing and code reviews to validate accuracy, support best-practice compliance, and enable error-free production deployment.
• Built automated reporting solutions using SSIS, SSRS, and Power BI, increasing data availability and supporting data-driven decision-making.
• Compile and maintain detailed documentation of database structures, relationships, and dependencies for development and troubleshooting.
• Guiding developers on SQL optimization methods and best practices.
• Supported projects enhancing delivery efficiency, technical resolution, and cross-team collaboration.

Support team lead responsible for:

• Train team members on software SQL support tools and customer communication.
• Assess and ensure quality of technical solutions delivered by team members.
• Directed support processes and optimized resource allocation via ticketing systems.
• Streamline system SQL development, resolve critical bugs, validate tested features, and design workflows supporting new functionality.
• Established strong working relationships with over 15 big clients through exceptional communication skills, fostering trust and collaboration.

• Developed and optimized ERP SQL and .NET code, resolving critical issues through immediate troubleshooting and solution delivery.
• Implement ERP features to resolve customer concerns and support training for 1000+ users across 20+ institutions.
• Responded to customer inquiries and resolved complaints to establish trust and increase satisfaction.
• Managed high-priority tickets with professionalism, ensuring timely resolutions while maintaining excellent rapport with clients.

• Provided end-to-end IT support for 20+ users and small businesses, addressing hardware, Windows clients, and network configuration.
• Tailored support solutions to diverse client environments, ensuring compatibility and minimal disruption to business operations.