Mainframe Cyber Security Engineer

We are seeking a skilled Mainframe Security Engineer to join our team. As part of the Mainframe RACF Security team the ideal candidate will help ensure the security and integrity of our mainframe systems and involve implementing security measures, monitoring and remediation of vulnerabilities, and responding to security incidents. Protect critical data and maintain compliance with industry standards. Help design, implement, and maintain security policies and procedures for mainframe systems. Monitoring mainframe security logs and alerts to detect and respond to potential security incidents. Recommend remediation strategies and remediate vulnerabilities. Participate in incident response activities, including investigation and reporting of security breaches. Collaborate with cross-functional teams to ensure security best practices are integrated into system development and operations. Create, review and maintain internal documentation (Run books, processes and procedures). Ability to meet assigned timelines and complete workloads within SLA. Help with daily monitoring of calls, for access requirements and requests, prioritise and provide support for user issues with access and system functionality. Review and Maintain Role Based Access Controls (RBAC), Privileged access, JML(Joiners/Leavers/Movers), Breakglass and Emergency processes. Extensive RACF & z/OS experience in mainframe security, including IBM z/OS, related technologies, and other z/OS components. SME RACF security product experience is vital. Extensive use of IBM z/Secure - including z/Alert, Command Verifier, Access Monitor, RACF Offline and CARLA reporting. Understanding of Role Based Access Controls (RBAC). Understanding of security framework protocols and compliance standards (e.g., NIST, ISO 27001, PCI-DSS, GDPR). Knowledge of ICFR controls - (previously Sarbanes-Oxley), security assessments and audits. Proficiency in security tools and technologies, such as intrusion detection systems, firewalls, and encryption methods for z/OS. Excellent analytical and problem‑solving skills, and able to work under tight timescales. Superb communication both verbal and written, with the ability to convey complex security concepts to non‑technical key players and others. Familiarity with programming languages such as REXX, COBOL, JCL, CLIST, ISPF etc. Our vision at Tesco is to become every customer's favourite way to shop, whether they are at home or out on the move. Our core purpose is ‘Serving our customers, communities and planet a little better every day’. Serving means more than a transactional relationship with our customers. It means acting as a responsible and sustainable business for all stakeholders, for the communities we are part of and for the planet. We are proud to have an inclusive culture at Tesco where everyone truly feels able to be themselves. At Tesco, we not only celebrate diversity, but recognise the value and opportunity it brings. We’re proud to have been accredited Disability Confident Leader and we’re committed to providing a fully inclusive and accessible recruitment process. We’re a big business and we can offer a range of diverse full‑time & part‑time working patterns across our many business areas, which means that we can find something that works for you. We work in a more blended pattern – combining office and remote working. Our offices will continue to be where we connect, collaborate, and innovate. If you are applying internally, please speak to the Hiring Manager about how this can work for you – Everyone is welcome at Tesco. #J-18808-Ljbffr