• Developed and maintained critical mainframe applications using COBOL, JCL, CICS, and DB2.• Led the migration of legacy systems to modern platforms, enhancing system performance by 35%.• Automated key business processes through mainframe services, resulting in a 35% increase in operational efficiency.• Provided 24/7 on-call support, adhering to Service Level Agreements (SLAs) and maintaining system uptime.• Utilized File-AID to manage and manipulate datasets, ensuring data integrity and accuracy.• Spearheaded the implementation of MQ Series for inter-application messaging, improving data transfer reliability.• Used Endevor for version control, ensuring proper change management in the production environment.• Conducted SAS/report writing, generating comprehensive reports for business analysis and decision-making.• Participated in Agile ceremonies, contributing to sprint planning, daily stand-ups, and retrospectives.• Managed and optimized GN configurations, reducing system errors by 25%.• Developed JCL scripts to automate batch job processes, reducing manual intervention by 30%.• Designed and executed unit test plans, ensuring the stability and functionality of new developments.• Provided mentorship to junior developers, increasing team productivity by 20%.

• Developed and maintained mainframe applications using COBOL, DB2, CICS, and JCL to support core business operations.• Led the implementation of Endevor for managing code versions, ensuring smooth transitions from development to production.• Enhanced batch job processing by optimizing JCL, reducing processing times by 30% and improving overall efficiency.• Provided on-call production support, adhering to SLAs and resolving critical issues within designated timeframes.• Leveraged SAS for generating detailed reports, providing valuable insights to business stakeholders.• Conducted root cause analysis for system issues, implementing long-term solutions and reducing system downtime by 40%.• Integrated MQ Series messaging for efficient communication between distributed systems, improving data accuracy and transfer speed.• Collaborated with business users and stakeholders to gather requirements and design solutions that align with business needs.• Used File-AID for data manipulation and validation during development and testing phases, ensuring data integrity.• Developed and executed unit and integration tests, ensuring new developments met business and technical specifications.• Participated in Agile development processes, contributing to sprint planning, daily stand-ups, and retrospectives.

• Developed, maintained, and optimized COBOL, CICS, JCL, and DB2 programs to support Mastercard's financial applications.• Implemented Endevor for version control, ensuring proper code management and seamless production deployments.• Utilized SAS for generating critical business reports, providing stakeholders with actionable insights to drive decisions.• Integrated MQ Series messaging into the system architecture, improving communication between distributed applications.• Optimized SQL queries within DB2, reducing query response times and enhancing overall system performance by 25%.• Provided 24/7 production support, ensuring adherence to SLAs and resolving critical incidents within required timeframes.• Conducted root cause analysis for system issues, implementing long-term solutions that reduced recurrence by 35%.• Used File-AID to manage datasets during development and testing, ensuring accurate and efficient data processing.• Actively participated in Agile/DevOps ceremonies, contributing to the continuous improvement of development processes.• Developed complex JCL scripts to automate batch processing, reducing manual intervention and increasing efficiency by 30%.