**Job Description :-** • Excellent understanding of System z architecture • Excellent experience with IBM z/OS operating system • Experience in building Mainframe LPAR and OS Upgrades • Knowledge Catalog management, IBM system utilities • Knowledge on VTAM, TCPIP, ACF2 and GDPS • Experience on z/VM, zVSE and z/Linux • Installation of patches and fixes • Installation and maintenance of ISV products, REXX, RMF, SMF • Administration and configuration of z/VM Operating Systems running SuSE or RedHat Linux • Installation and customization of z/VM and related IBM or other ISV software; • Extensive experience with providing performance and tuning using monitoring tools (f. ex. z/VM Performance Monitor or other tools); • DIRMAINT administration – RACF/Top secret administration; • REXX knowledge - SSI knowledge; • Ability to support network configuration and maintenance (Real TCP/IP stack, VSWITCH, TCPIP tools in z/VM, etc.); • Solid skills in z/Linux system cloning and configuration including memory and file system allocation; • System parameters/parmlib maintenance • Managing incidents on z/OS related issues • z/OS performance monitoring and reporting • Knowledge on DFSMS, DFSMShsm, Flashcopy, ICF Catalogs, HCD • Capable of planning and supporting Disaster recovery exercises • Performance tuning & Development of operational procedures • Experience with system indicators (logs, dumps, error) logs for pro-active management of system problems • Installation and maintenance of ISV products (For zVM, ZVSE and zOS) • Ability to work with Developers in fixing issues Key Responsibilities: • Incident Management / Problem Management by performing problem analysis and resolution implementation • Support maintenance release and major OS upgrades. • Process client requests for system software modifications • Review system indicators (logs, dumps, error) logs for pro-active management of system problems • Work with operations to monitor, maintain and IPL systems to improve consistency and availability • Monitor / Tune system performance and work with performance engineering and capacity teams • Ensure availability and performance objectives, as required by clients and management, are maintained for operating systems and for system software components • Implement appropriate tools and processes to automate repeated tasks • Manage various license codes for infrastructure software. • Capable of planning and supporting Disaster recovery exercises • Performance tuning & Development of operational procedures • Implement changes as needed to support other towers and day-to-day operations. • Work with IBM and other Independent Software Vendors on a regular basis • Provide regular management reports / analysis to senior management team regarding Incidents, Changes and requests Cognizant is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to sex, gender identity, sexual orientation, race, color, religion, national origin, disability, protected Veteran status, age, or any other characteristic protected by law.