Dutech’s Job

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.