Senior Mainframe System Administrator

Senior Mainframe System Administrator – Cincinnati, OH (Onsite)

We are looking for a Senior Mainframe Systems Administrator to manage and maintain our client’s z/OS and z/VM platforms that support critical business applications.

• Administer and support enterprise IBM mainframe environments, including z/OS and z/VM, ensuring high availability for critical business applications.
• Monitor system health, performance, and batch operations using tools such as SDSF, ISPF, and JCL, resolving issues proactively.
• Perform system maintenance activities including patching, upgrades, IPL planning, capacity management, and disaster recovery readiness.
• Manage security administration, user access controls, RACF/permissions, and compliance standards within a regulated financial environment.
• Partner with infrastructure, networking, storage, and application teams to troubleshoot incidents, optimize operations, and improve automation.

• Strong hands‑on experience administering IBM z/OS and z/VM mainframe systems in a production environment.
• Proficiency with JCL, SDSF, ISPF, TSO, and core mainframe operational utilities.
• Experience with mainframe security administration, including access management, RACF, or similar controls.
• Knowledge of performance tuning, capacity planning, batch scheduling, storage, and system monitoring.
• Ability to troubleshoot complex infrastructure issues and work cross‑functionally in a 24x7 mission‑critical environment.

• Health, Dental, Vision coverage
• Voluntary Short & Long‑Term Disability
• Voluntary Life Insurance
• 401(k) plan

Vernovis provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state, or local laws. This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leave of absence, compensation, and training.