Senior z/OS Mainframe Systems Administrator

Skills:

TSS (Top Secret Security), administering z/OS environments, JES2, OMVS, and SMS, TLS configuration, z/OS operations, z/OS networking (VTAM, TCP/IP),JCL, VSAM, TSO, GRS, RMF, SMF, WLM, SMP/E, Job scheduling tools (JOBTRAC), Terminal emulation tools (BlueZone)

We are seeking an experienced Senior z/OS Mainframe Systems Administrator to support and maintain a mission-critical mainframe environment. The ideal candidate will have deep hands-on expertise in z/OS administration, TSS (Top Secret Security), system utilities, networking, and performance monitoring , with the ability to support secure, high-availability enterprise systems.

Key Responsibilities

• Administer and support z/OS mainframe environments , ensuring system stability, performance, and security.

• Manage and support Top Secret Security (TSS) , including access controls, security policies, and compliance.

• Administer JES2 , z/OS Unix System Services (OMVS) , and Storage Management Subsystem (SMS) .

• Configure and maintain TLS/SSL security , including certificate management, RSA keys, SFTP, and FTPS.

• Monitor system performance using tools such as RMF, SMF, and WLM , and perform initial analysis of performance issues.

• Support z/OS networking , including VTAM and TCP/IP configurations.

• Manage automated job scheduling and workload management using tools such as JOBTRAC .

• Apply system maintenance and upgrades using SMP/E .

• Support VSAM datasets , JCL , TSO , and GRS for daily operations.

• Utilize terminal emulator tools such as BlueZone and VTAM/SWITCH for system access and session management.

• Support and administer Informatica PowerExchange (preferred).

• Develop and maintain scripts using REXX (preferred).

• Collaborate with application teams, security teams, and infrastructure teams to resolve system issues and implement improvements.

• Ensure compliance with enterprise security, audit, and operational standards.

Required Qualifications

• 8+ years of hands-on experience with TSS (Top Secret Security) .

• 5+ years of hands-on experience administering z/OS environments.

• 5+ years of experience with JES2, OMVS, and SMS .

• 3+ years of experience with TLS configuration , including certificates, SSL, RSA keys, SFTP, and FTPS.

• Strong working knowledge of:

  • z/OS operations

  • z/OS networking (VTAM, TCP/IP)

  • JCL, VSAM, TSO, GRS

  • RMF, SMF, WLM

  • SMP/E

  • Job scheduling tools (JOBTRAC)

  • Terminal emulation tools (BlueZone)

Preferred Qualifications

• Experience with REXX scripting .

• Experience with performance monitoring and tuning .

• Experience with Informatica PowerExchange administration .

• Strong troubleshooting, documentation, and communication skills.