Mainframe Logical Security Engineer

Required Qualifications

• 5+ years of experience in IBM z/OS mainframe environments.
• Strong hands-on experience with RACF administration (or ACF2 / Top Secret).
• Experience with user and group management.
• Experience administering dataset and subsystem security.
• Experience conducting security audits and access reviews.
• Experience monitoring and analyzing security logs.
• Strong understanding of z/OS security architecture, access control models, and compliance practices.
• Excellent troubleshooting and analytical skills.

Roles & Responsibilities

• Administer and support RACF, ACF2, or Top Secret security environments.
• Manage user IDs, groups, roles, and access permissions.
• Configure and maintain dataset and subsystem security controls.
• Perform access reviews, security audits, and compliance validations.
• Monitor security logs and investigate access/security-related issues.
• Troubleshoot and resolve security administration requests and incidents.
• Partner with audit, compliance, and infrastructure teams to maintain secure operations.
• Support regulatory, internal, and external audit requirements.

Preferred Qualifications

• Experience with ACF2 or Top Secret.
• Familiarity with SIEM tools such as Splunk, QRadar, or similar.
• Experience supporting enterprise audits and compliance initiatives.
• Exposure to IAM, SSO, and MFA solutions.
• Automation or scripting experience (REXX, Python, Shell).
• Experience in financial services or other regulated environments.

Key Skills

• IBM z/OS Security
• RACF / ACF2 / Top Secret
• User & Group Administration
• Dataset & Subsystem Security
• Security Audits & Access Reviews
• Security Log Monitoring
• Compliance & Access Controls
• SIEM Tools (Splunk, QRadar)
• IAM, SSO, MFA
• REXX, Python, Shell Scripting

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