Over 12 years of experience in the IT field, with the last 7 years as a Mainframe Computer Operator specializing in mainframe operations and supporting Z/OS infrastructures. Responsibilities included managing batch processing, monitoring system performance, and collaborating with database and scheduling teams to resolve issues promptly. Achieved a 15% reduction in batch processing times and an 18% improvement in overall system efficiency through process optimization and automation. Human errors were minimized by 20%, while system stability was maintained during 24/7 shift work.By implementing Db2 utilities within system routines, job execution efficiency improved by 5%, optimizing resource usage during batch processes. Familiarity with JCL facilitated better error detection and debugging, reducing JCL-related job failures by 10%, and ensuring smoother system operations. Leveraging CICS for enhanced transaction monitoring improved oversight by 5%, accelerating issue resolution and contributing to system stability. Experience with WebSphere enhanced communication between applications, leading to a 7% increase in overall system throughput.Prior experience in network administration, along with a master’s degree in Computer Networks, developed a deep understanding of large-scale data centers and infrastructures. This knowledge has been essential in managing complex infrastructures in mainframe environments. During the network administration period, network performance improved by 15%, and issue resolution times were reduced by 20% through optimization and automation. Such advancements boosted the capacity to oversee large-scale infrastructure within mainframe environments.