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As a Senior Cyber Security Engineer, you will play a critical role in delivering Thames Water’s cyber strategy, 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.
Job Responsibility:
Collaborate with stakeholders to design, implement and maintain security controls to meet business, compliance, and risk mitigation requirements
Implement and maintain detection and response capabilities through SIEM integration with security controls and IT systems
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 standardized 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
Requirements:
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
You must be able to obtain Counter Terrorist Check (CTC) Clearance to be eligible for this position
Nice to have:
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 cyber security outcomes
Security engineering vendor or product certifications such as Microsoft Certified: Azure Security Engineer Associate, Tenable, or CyberArk
What we offer:
Competitive salary up to £78,000 per annum depending on experience
Annual Leave - 26 days holiday per year increasing to 30 with the length of service (plus bank holidays)
Generous Pension Scheme through AON
Access to lots of benefits to help you take care of you and your family’s health and wellbeing, and your finances – from annual health MOTs and access to physiotherapy and counselling, to Cycle to Work schemes, shopping vouchers and life assurance