We are seeking a highly capable Senior Cyber Security Engineer to play a key role in the design, implementation, operation, and continuous improvement of enterprise security capabilities across both IT and Operational Technology (OT) environments. This is a hands-on engineering role focused on building and maintaining security controls that enable early threat detection, rapid response, and measurable cyber risk reduction. The successful candidate will work closely with technology, operational, and security teams to translate business requirements, regulatory obligations, and cyber risks into scalable, supportable, and effective security solutions. Importantly, this role extends beyond project delivery. The successful individual will take ownership of the ongoing operation, optimisation, and support of security capabilities, ensuring that solutions transition successfully into business-as-usual (BAU) operations and continue delivering value over time. Candidates must be eligible to obtain CTC clearance. Key Responsibilities Design, implement, configure, and maintain security controls across enterprise IT and OT environments. Engineer and continuously improve detection and response capabilities through the integration of SIEM, EDR, SOAR, email security, identity, and infrastructure platforms. Develop and maintain high-quality detection use cases, alerting mechanisms, enrichment processes, and automated response workflows. Take ownership of security technologies once implemented, ensuring ongoing support, maintenance, optimisation, and operational effectiveness. Ensure all new security capabilities are successfully transitioned into BAU operations with appropriate processes, documentation, monitoring, and support models. Participate in a 24x7 on-call support rota to maintain security service availability and respond to platform health issues where required. Monitor the effectiveness of security controls and identify opportunities to improve visibility, resilience, and risk reduction. Use lessons learned from incidents, audits, threat intelligence, and risk assessments to enhance existing security capabilities. Drive automation initiatives to improve operational efficiency, response consistency, and reporting accuracy. Define and maintain operational procedures, standards, and engineering documentation. Collaborate with technology, infrastructure, OT, cloud, and security operations teams to ensure controls are deployed and maintained in line with agreed standards. Communicate technical risks, recommendations, and remediation activities effectively to both technical and non-technical stakeholders. Support internal and external audits, compliance reviews, and security assessments. Align control design and engineering practices with industry standards, regulatory requirements, and security frameworks. Ensure security solutions remain measurable, supportable, and aligned to organisational risk appetite. Provide technical leadership and guidance on security technologies, engineering best practices, and future capability development. Experience Required Proven experience in Security Engineering within a large enterprise environment. Strong background in Detection
Senior Cyber Security Engineer employer: GCS
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