Mainframe Security Engineer - Logical Security

Job Description – Mainframe Systems Programmer (RACF Security Administration)

ABOUT US

Ensono is a hybrid IT services provider that sees a world in transformation. We understand the world of business has become more complex, layered, and interdependent because we’re enabling the IT infrastructure for that transformation. Our clients are some of the most innovative and forward-thinking companies in the world and we help keep their businesses thriving. With nearly 50 years of experience, we optimize and modernize IT infrastructure by amplifying the power of mainframes and mid-range servers with the agility of cloud. Check us out at www.ensono.com.

The Mainframe Systems Programmer – RACF Security Administration is responsible for the administration, maintenance, support, and enhancement of IBM z/OS security environments with a strong focus on RACF (Resource Access Control Facility). This role ensures the integrity, confidentiality, and availability of enterprise mainframe systems while supporting compliance, audit, and operational requirements. As well as Digital Certificate renewals and creation.

Position Summary

This career-level position provides technical support and administration for enterprise mainframe security infrastructure. The ideal candidate will possess hands-on experience with RACF administration, z/OS system security, user provisioning, access controls, auditing, digital certificates and compliance standards. The role requires collaboration with infrastructure teams, auditors, application support, and business stakeholders to maintain a secure and stable mainframe environment.

Key Responsibilities

• Administer and maintain RACF security definitions, user IDs, groups, datasets, and resource profiles.
• Implement and manage access controls for z/OS systems, applications, datasets, and subsystems.
• Monitor RACF system logs, SMF records, and security events for compliance and incident response.
• Support security audits and ensure compliance with organizational and regulatory requirements.
• Analyze and resolve RACF-related incidents, access issues, and security vulnerabilities.
• Collaborate with application teams to implement secure access solutions and role-based access controls.
• Develop and maintain operational procedures, standards, and technical documentation.
• Support system upgrades, migrations, and implementation of new security features.
• Work closely with system programmers, auditors, and cybersecurity teams to strengthen enterprise security posture.

Required Qualifications

• 3–7 years of experience supporting IBM z/OS mainframe environments.
• Hands-on experience administering RACF security in enterprise environments.
• Strong understanding of z/OS security architecture and mainframe operations.
• Experience with TSO/ISPF, JCL, SDSF, and IBM utilities.
• Knowledge of SMF records, security reporting, and audit compliance processes.
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