Senior Mainframe Administrator (zOS and Networking)

Springfield, VT - USA

Monthly Salary: Not Disclosed

Posted on: 14-10-2025

Vacancies: 1 Vacancy

Job Summary

For further inquiries regarding the following opportunity please contact our Talent Specialist.
Abdul at

Vinod at

Job Title: Senior Mainframe Administrator (z/OS and Networking)
Location: Springfield IL
Duration: 6 months

Job Summary:

We are seeking a Senior Mainframe Administrator with extensive experience in IBM z/OS systems and mainframe networking to lead operational support system maintenance and performance optimization efforts.
This role will involve advanced troubleshooting system configuration and collaboration with technical teams to ensure the stability availability and security of mission-critical mainframe environments.

Responsibilities:

Provide advanced system administration and technical leadership for IBM z/OS mainframe systems.
Oversee system performance management tuning and capacity planning to ensure optimal operations.
Manage and maintain network configurations connectivity and communication protocols (SNA TCP/IP VTAM NJE etc.) in the mainframe environment.
Troubleshoot and resolve complex system network and application-level issues driving root cause analysis and long-term corrective actions.
Lead and perform IPL (Initial Program Load) activities system backups recovery and disaster recovery testing.
Plan and apply system maintenance software upgrades and PTFs coordinating with system programmers and vendor support.
Administer and enforce mainframe security policies (RACF ACF2 or Top Secret) including user access management and compliance controls.
Participate in and provide guidance for problem change and incident management processes ensuring timely resolution and documentation.
Collaborate with infrastructure application and network teams to ensure seamless integration and high availability across systems.
Mentor junior administrators and contribute to process improvement and automation initiatives.

Required Skills & Experience:

7 years of hands-on experience in mainframe system administration with deep expertise in z/OS.
Strong understanding of mainframe networking including SNA TCP/IP VTAM NJE and related tools (NetView Wireshark etc.).
Proficiency with JCL TSO/ISPF and monitoring tools such as SDSF RMF OMEGAMON SysView or equivalent.
Experience with JES2/JES3 job management system logs and IPL processes.
Solid knowledge of storage management dataset allocation and HSM principles.
Expertise in security administration using RACF ACF2 or Top Secret.
Familiarity with automation tools scheduling systems (CA-7 Control-M) and performance tuning techniques.
Strong troubleshooting diagnostic and analytical abilities.
Experience working in high-availability enterprise-scale environments.

About us: DivIHN the IT Asset Performance Services organization provides Professional Consulting Custom Projects and Professional Resource Augmentation services to clients in the Mid-West and beyond. The strategic characteristics of the organization are Standardization Specialization and Collaboration. DivIHN is an equal opportunity employer. DivIHN does not and shall not discriminate against any employee or qualified applicant on the basis of race color religion (creed) gender gender expression age national origin (ancestry) disability marital status sexual orientation or military status.

For further inquiries regarding the following opportunity please contact our Talent Specialist. Abdul at Vinod at Job Title: Senior Mainframe Administrator (z/OS and Networking) Location: Springfield IL Duration: 6 months Job Summary: We are seeking a Senior Mainframe Administrator with ...