Application Design, Cobol, Performance Tuning, Apis, Mq, Ibm Mq, Debugging, CICS, Sql, Impact Analysis, Web Services, DB2, JCL, Mainframe application development, ChangeMan Endevor, Enterprise integration patterns, Release management processes, Modernizing legacy mainframe applications, Batch and online transactional systems, Package Plan concepts, Stored Procedures, Agile delivery methodologies, Reducing technical debt