Senior Associate, Mainframe Infrastructure Testing Engineer

We are seeking an experienced Mainframe Test Senior Associate to provide specialized systems knowledge and testing coverage across IBM mainframe services. This position combines systems-level mainframe expertise with environment management engineering. The engineer will assess change impacts, define and execute validation strategies, verify platform and workload readiness, analyze failures, and provide clear evidence-based recommendations for changes affecting critical services. The ideal candidate brings strong z/OS and mainframe ecosystem knowledge and understands that this is a testing position. The priority is deep systems expertise that can be applied to independent validation, with testing processes and DTCC-specific practices developed through onboarding and knowledge transfer.