Sr. Systems Administrator

TEKsystems • Sioux Falls, SD

11d • $60 - $72 • Remote

About The Position

We are seeking a Senior Mainframe Systems Administrator to join a high-performing Mainframe and Operations team. This role focuses on administration and support of IBM z/OS environments, ensuring system stability, performance, and disaster recovery readiness. This is a contract-to-hire opportunity with the potential to convert to full-time in 2026.

Requirements

• 8+ years of experience with IBM Mainframe systems administration.
• Expertise in z/OS, MVS, and DFSMS.
• Familiarity with RACF, SDSF, JES2/JES3, SMP/E, and Unix System Services.
• Ability to work efficiently in an interrupt-driven environment.
• Strong troubleshooting and problem-solving skills.

Nice To Haves

• Knowledge of REXX, JCL, Assembler, COBOL.
• Experience with IBM Z architecture and related products (CICS, DB2, WebSphere MQ).

Responsibilities

• Support and maintain IBM z/OS Mainframe systems (currently z/OS 3.1).
• Perform system updates, disk management, backups, and disaster recovery planning.
• Monitor system performance and workload distribution using WLM policies and RMF reports.
• Apply PTFs and APARs for system updates and conduct regular IPL cycles.
• Manage storage using DFSMS and related policies.
• Collaborate with vendors to resolve hardware/software issues.
• Participate in disaster recovery tests and capacity planning.
• Construct and edit JCL code as needed (not a programming-heavy role).

Benefits

• Medical, dental & vision
• Critical Illness, Accident, and Hospital
• 401(k) Retirement Plan – Pre-tax and Roth post-tax contributions available
• Life Insurance (Voluntary Life & AD&D for the employee and dependents)
• Short and long-term disability
• Health Spending Account (HSA)
• Transportation benefits
• Employee Assistance Program
• Time Off/Leave (PTO, Vacation or Sick Leave)

What This Job Offers

• Career Level: Mid Level
• Education Level: No Education Listed
• Number of Employees: 5,001-10,000 employees