Senior Mainframe Engineer – z/OS, ISV Ops, 24/7 On‑Call

Ztek Consulting, Inc.; Atlanta (GA); On-site; USD 105,000 - 165,000; Full time

Job summary

Ztek Consulting, Inc. seeks a seasoned z/OS System Programmer to manage installation, upgrades, and maintenance of IBM mainframe environments in a fast-paced enterprise setting.

You will work with leading ISV products and mainframe subsystems, coordinating with vendors and operations teams to ensure system reliability and optimal performance. The role includes 24/7 on-call support and DR readiness.

Qualifications

• Hands-on experience with z/OS installation, configuration, and maintenance.
• Experience applying IBM PTFs and APARs to maintain system integrity.
• Plan and execute z/OS upgrades and migrations.
• Collaborate with hardware and software vendors for problem resolution.
• Provide expert-level support for mainframe incidents.

Responsibilities

• Triage and resolve critical mainframe incidents in timely manner.
• Analyze system logs and performance data to identify bottlenecks.
• Manage and maintain critical system datasets (e.g., SYSRES, Page datasets, SMF datasets).
• Monitor health and performance using RMF, SMF, TMON, and SAS.
• Participate in on-call rotation for 24/7 support.

Skills

z/OS administration

Mainframe problem solving

RMF/SMF performance analysis

JES/IO subsystem knowledge

HMC/SE familiarity

Tools

HMC/SE

IOCDS/IODF

FICON

GDPS

WLM

Job description

Ztek Consulting, Inc. seeks a seasoned z/OS System Programmer to manage installation, upgrades, and maintenance of IBM mainframe environments in a fast-paced enterprise setting.

You will work with leading ISV products and mainframe subsystems, coordinating with vendors and operations teams to ensure system reliability and optimal performance. The role includes 24/7 on-call support and DR readiness.