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As a Senior Cyber Security Engineer, you will play a critical role in delivering cyber strategies, with responsibility for the design, implementation, and ongoing effectiveness of security capabilities across IT and OT environments.

You will engineer and maintain the technical capabilities that enable early threat detection, rapid and consistent response, and sustained cyber risk reduction, while translating cyber risk, regulatory, and business demands into practical, measurable, and operationally sustainable security controls.

This is a hands‑on engineering role for individuals who enjoy building resilient security capabilities, integrating platforms and telemetry, and turning strategy, risk, and incident learnings into practical engineering outcomes. The role requires a strong understanding of security engineering concepts, infrastructure technologies, and best practices, along with the ability to collaborate effectively across IT, OT, and security operations to drive continuous improvement.

You must be able to obtain Counter Terrorist Check (CTC) Clearance to be eligible for this position.

What you'll be doing as a Senior Cyber Security Engineer

Collaborate with stakeholders to design, implement and maintain security controls to meet business, compliance, and risk mitigation requirements; ensuring controls are effective, measurable, and operationally sustainable.Implement and maintain detection and response capabilities through SIEM integration with security controls and IT systems, with a focus on reducing time‑to‑detect and time‑to‑remediate through improved pre‑incident engineering.Participation in a 24x7 on‑call support rota, responding to SIEM health alerts and restoring log ingestion where required.Manage use cases, perform data enrichment, and define standardised and automated containment workflows.Develop and manage operational procedures and reporting methodology.Manage and oversee security technology platforms (e.g. SIEM, SOAR, EDR, and email security).Monitor ongoing control performance and coordinate remediation where gaps are found.Automate operation procedures and reporting processes and integrate outputs into risk reporting frameworks.Liaise with IT and OT teams to ensure controls are implemented according to agreed baselines.Align control design with industry standards, regulations, and best practices. (e.g. NIS, ISO27001, GDPR).Support audits, reviews, and assessments of security controls.Identify and implement improvements to control coverage and resilience.Proactively advise on technology, best practices, and delivery models.

What you should bring to the role

Experience in Security Engineering, with a focus on detection & response engineering in an enterprise environment.Strong understanding of both IT and OT systems and infrastructure.Experience in identifying and remediating cyber risks in evolving digital environments.Familiarity with SIEM, EDR, email security and identity and access management technologies (e.g. Entra ID, CyberArk).Familiarity with a range of operating systems and security considerations across SaaS, IaaS, end-user computing, and server estate.Sound knowledge of cloud and network security technologies.Strong analytical, planning, and organisational skills.Ability to communicate technical issues clearly to non-technical stakeholders.Degree in Cyber Security, Computer Science, Information Technology, Engineering, or a related field.Industry certification(s) such as CISSP, CCSP, CompTIA Security+, or SC-200.

It would be great if you also had

Previous experience working in a large, complex infrastructure-based or water utility organisation.Experience in systems or network administration in IT and/or OT environments.Experience leading or mentoring others in delivering cybersecurity outcomes.Security engineering vendor or product certifications such as Microsoft Certified: Azure Security Engineer Associate, Tenable, or CyberArk.

GCS is acting as an Employment Agency in relation to this vacancy.

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