Salary: £50,000 - 90,000 per year Requirements: Proven experience (typically 5-7 years) in a progressive security operations or defense engineering role Demonstrated experience in formal team leadership, mentorship, or technical management capacity Exceptional ability to communicate and collaborate effectively across diverse technical teams Strong technical expertise in Linux and Windows operating system security and hardening best practices Solid understanding of networking and security protocols (TCP/IP, DNS, TLS) Expert knowledge of security defense principles and practical expertise with enterprise security tools (e.g., SIEM, EDR) Experience supporting Cloud Security Operations (GCP/AWS/Azure) is highly desirable Bachelors degree in Computer Science, Information Security, or a related technical field Relevant advanced industry certifications such as CISSP, CISM, or advanced GIAC certifications are preferred Experience with security technologies including Secure Access Service Edge (SASE), SIEM, DLP, WAF, and others Responsibilities: Serve as the technical leader for our weekend operational defense posture Ensure seamless execution of security operations across our distributed teams Act as the operational escalation contact during incidents involving Cyber Defense Applications Direct and coordinate global response efforts and ensure clear communication across shifts Assume accountability for the execution and governance of security-related tasks during disaster recovery exercises Serve as the authorized escalation point for weekly Change Status meetings Oversee operational health, configuration, and maintenance lifecycle of security tools Mentor and develop the two-person teams across different regions Identify opportunities for automation and enhance security control processes Conduct periodic quality reviews and audits of operational documentation Technologies: AWS Azure Cloud GCP Linux Security TCP/IP WAF Windows API Firewall GIS Support Network Python Web More: At CME Group, where Futures are Made, we are the worlds leading derivatives marketplace. Our Staff Security Engineer - Operations will play a crucial role in ensuring continuous market protection. We offer a dynamic work environment with benefits including a Bonus Programme, Equity Programme, and ongoing training opportunities. This role requires a minimum 2-day in-office presence, primarily based in our CME Group Belfast office. We value every employees unique experiences and skills, ensuring that all perspectives are recognized and appreciated. last updated 7 week of 2026