Sr. Systems Administrator

Overview:

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.

• 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).

• 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.

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

• 100% Remote (must be based in the U.S.).
• Standard hours:
  Mon–Thu 7:30 AM–5:00 PM CST, Fri until 12:30 PM CST.
• On-call rotation every 3 weeks (average issue resolution: ~10 minutes).

• Work with a seasoned team of experts (15–20 years experience).
• Opportunity to learn and grow in a collaborative environment.
• Path to full-time employment in 2026.

This is a Contract to Hire position based out of Sioux Falls, SD.

The pay range for this position is $60.00 - $72.00/hr.

Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following:
• 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)

This is a fully remote position.

This position is anticipated to close on Jan 5, 2026.

We're partners in transformation. We help clients activate ideas and solutions to take advantage of a new world of opportunity. We are a team of 80,000 strong, working with over 6,000 clients, including 80% of the Fortune 500, across North America, Europe and Asia. As an industry leader in Full-Stack Technology Services, Talent Services, and real-world application, we work with progressive leaders to drive change.

That's the power of true partnership. TEKsystems is an Allegis Group company.

About TEKsystems and TEKsystems Global Services

We’re a leading provider of business and technology services. We accelerate business transformation for our customers. Our expertise in strategy, design, execution and operations unlocks business value through a range of solutions. We’re a team of 80,000 strong, working with over 6,000 customers, including 80% of the Fortune 500 across North America, Europe and Asia, who partner with us for our scale, full-stack capabilities and speed.

We’re strategic thinkers, hands-on collaborators, helping customers capitalize on change and master the momentum of technology. We’re building tomorrow by delivering business outcomes and making positive impacts in our global communities. TEKsystems and TEKsystems Global Services are Allegis Group companies. Learn more at

The company is an equal opportunity employer and will consider all applications without regards to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.