Senior Mainframe Administrator (z / OS and Networking)

DivIHN Integration IncSpringfield, IL, United States

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

Abdul at (224) 507-1295

Vinod at (224) 507-1294

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.

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