OT Cyber Security Analyst

We are seeking a highly skilled and experiencedOT Senior Cyber Security Analystto join our dynamic Security Operations team at Thames Water. As the UK’s largest water company, we are committed to ensuring the highest level of security and compliance, protecting the critical infrastructure that delivers essential water services to 16 million customers. In this role, you will be responsible for maintaining SecOps solutions, controls, and processes across the organisation, while mentoring and leading the SOC team to ensure effective management of OT alerts and incidents.

This position requires a deep understanding of SecOps concepts, technologies, and best practices, specifically across IT and OT environments. You will be tasked with ensuring robust incident management, proactive threat detection, and continuous improvement of our security posture. Strong communication and collaboration skills are essential as you will work closely with cross-functional teams to mitigate risks and protect Thames Water's essential services.

What you’ll do as an OT Senior Cyber Security Analyst

Contextualise OT Specific Threats:
• Understand the Operational Technology (OT) estate, specific OT threats, and controls in place to mitigate risks.
• Use tools like Claroty to analyse network traffic and OT hardware limitations, ensuring minimal downtime due to active scans.
• Build direct relationships with Operations teams to understand and articulate operational and cyber risk.

Maintain Security Operations:
• Maintain effective security operations processes, ensuring continuous improvement across security tools and services.
• Support an effective security operations environment using tools such as Microsoft Sentinel, SOAR, EDR/XDR, and PAM.
• Achieve reductions in repetitive alerts and improve the time taken to investigate and resolve incidents.

Proactive Risk Remediation:
• Identify, analyse, and evaluate security risks, applying a risk-based approach to implement appropriate and proportionate controls.
• Perform proactive activities such as threat hunting to uncover vulnerabilities and ensure continuous risk reduction.
• Provide tangible metrics to demonstrate risk reduction and reduced technical debt.

Incident Readiness & Response:
• Lead the incident triage and response process, ensuring effective management and remediation of cybersecurity incidents.
• Improve incident management by reducing business impacts and the time between incident identification and closure.
• Ensure the business is regularly educated on incident management procedures and that all staff know how to report cybersecurity incidents.

Continuous Improvement:
• Drive process improvements to increase operational efficiency, using automation to reduce manual tasks.
• Demonstrate improvements over time through KPIs, dashboards, and reporting, showing better response times and proactive security measures.

Key relationships and interactions:
•CISO
•Operational Technology Teams
•IT Operations
•Security Operations Manager
•Security Architecture Manager
•Cyber Security Programme Manager
•Cyber Resilience Manager
•Network Operations Manager
•Business Change and Engagement
•Key Business Stakeholders
•Service Owners

What you should bring to the role:

Essential Experience:
• Experience working with technical Cyber Security controls, preferably in an enterprise or critical infrastructure environment.
• Experience in control systems of essential services, including ICS, SCADA, and CNI.
• Exposure to working in or with a security operations centre (SOC).
• Experience in triaging issues and incidents in a structured, disciplined manner.
• Proven track record of remediating cyber risks in dynamic and evolving digital environments.

Essential Technical Skills & Qualifications:
• Ability to simplify complex IT and Security problems for non-technical audiences.
• Strong understanding of OT infrastructure, networking, and end-user computing.
• Proficiency in writing Kusto Query Language (KQL) for creating and tuning SIEM queries and alerts.
• Experience in configuring and troubleshooting MFA, Privileged Access Management (PAM), and Security Information & Event Management (SIEM) systems, particularly Microsoft Sentinel.

Desirable Experience:
• Familiarity with managing network security capabilities such as NAC, Firewalls, Proxies/VPN, IDS/IPS, etc.
• Leadership experience in mentoring and managing a team to deliver operational excellence.

Desirable Technical Skills & Qualifications:
• Degree in Cyber Security, Computer Science, Information Technology, Engineering, or a related field.
• Microsoft SecOps certification(s) such as Microsoft Security Operations Analyst (SC-200, AZ-900).
• Any industry-recognised cybersecurity certifications, such as CCSP or OT-specific certifications like Clarity Cybersecurity Analyst.

What’s in it for you?

Annual Leave - 26 days holidayper year, increasing to 30 with the length of service (plus bank holidays)
Generous Pension Schemethrough 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.