Mainframe Security Architect - z/OS | RACF | ACF2

Mainframe Security Architect – z/OS | RACF | ACF2We’re seeking an experienced Mainframe Security Architect to join an enterprise infrastructure team, with a focus on safeguarding their IBM Z Series environments.You will be at the forefront of mainframe security strategy, designing and implementing robust access controls, monitoring systems, and risk management frameworks. This is a high-impact role with wide scope for technical authority and strategic influence across a complex, high-volume infrastructure.Key ResponsibilitiesArchitect and maintain end-to-end security frameworks for IBM Z Series mainframe environments.Lead threat modeling, vulnerability assessments, and remediation plans specific to z/OS, RACF, ACF2 or Top Secret environments.Collaborate with infrastructure, application, and compliance teams to implement secure configurations and access control models.Drive security policy enforcement across core systems including CICS, DB2, IMS, and MQ.Evaluate and integrate security tools (e.g. IBM zSecure, CA ACF2 utilities, encryption modules) into mainframe operations.ExperienceProven experience as a security architect or engineer in z/OS or IBM Z Series environments.Strong command of RACF, ACF2, or Top Secret mainframe security systems.Hands-on experience with enterprise-wide identity and access management (IAM) for mainframes.Expertise in encryption, data masking, and privileged access control on z/OS.Experience designing controls aligned with ISO 27001, NIST, or GDPR compliance.Why Join?Be part of a mission-critical function supporting large-scale enterprise operations.Work in a collaborative, forward-thinking culture with a focus on innovation and resilience.Access to ongoing training, certifications, and leadership development.