We are seeking a highly experienced Mainframe MQ Security SME to support a critical remediation project for a leading client environment. The successful candidate will provide specialist expertise in IBM MQ on Mainframe environments, with a strong focus on Broadcom Top Secret (TSS) security administration and audit remediation. This role is project-based and requires an experienced subject matter expert with deep technical knowledge and hands-on experience in securing MQ Mainframe environments.   Key Responsibilities Assist with MQ Mainframe security remediation activities relating to current audit findings. Analyse and isolate security patterns for: Batch environments. CICS environments. User access management. Third-party tool integrations. Collaborate with engineering teams and MQ Mainframe SMEs to implement secure access controls and best practices. Support the implementation of security improvements ahead of the project deadline. Provide technical guidance and recommendations aligned with enterprise security standards and Zero-Trust principles.   Contract Details Contract / project-based opportunity. Immediate availability preferred. Deadline-driven environment with remediation completion required before September. Minimum Requirements Minimum 10 years of hands-on experience in Mainframe environments. Proven applied experience with IBM MQ on z/OS. Strong expertise in Broadcom / CA Top Secret (TSS) administration and security management. Extensive experience working within enterprise Mainframe security environments. Ability to troubleshoot and remediate MQ security-related audit findings. Strong understanding of DevOps principles within Mainframe environments.   Technical Skill Matrix Category Required Skillset / Tools Messaging Infrastructure IBM MQ for z/OS, Channel Initiator (CHINIT), Sysplex Shared Queues Mainframe Security Broadcom / CA Top Secret (TSS) Administration, ACID Management Protocols Cryptography TLS/SSL Handshakes, Digital Certificates, Mainframe Keyrings Diagnostics Tools TSSUTIL, TSSTRACK, SDSF, TSO/ISPF, JCL Methodologies Mainframe Modernisation, Zero-Trust Architecture, DevOps-to-Mainframe   Preferred Experience Experience within large enterprise or banking environments. Previous involvement in audit remediation and security compliance initiatives. Ability to engage effectively with both technical and business stakeholders.