DE performing mainframe application development and performance tuning within TSO and MVS operating system environments; developing applications, using Endevor, Git, ClearCase (for version control), Control-M (for scheduling), Abend-AID and Intertest (for debugging), File-Aid (for browsing), and Easytrieve (for report generation); and conducting performance tuning and capacity planning -- reducing I/Os, CPU Time, MSUs, and MIPs -- using Strobe, iStrobe, Platinum Detector, and TMON. We use knowledge of Financial Domain, Feed processing of Demographic and Financial feeds, Recordkeeping and Transaction processing to translate the business requirement to Software solutions developing Simple/Sophisticated Services to Onboard a New Client as well as Improvement to the process of an existing Client on a mainframe platform running under a Z/OS environment!