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We are seeking a highly skilled and experienced OT Senior Cyber Security Analyst to 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 15 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:

• Minimum of 3 years of experience working with technical Cyber Security controls, preferably in an enterprise or critical infrastructure environment.

• Minimum of 3 years of 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?

• Competitive salary up to £65,000 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.

Find out more about our benefits and perks.

Who are we?

We’re the UK’s largest water and wastewater company, with more than 16 million customers relying on us every day to supply water for their taps and toilets. We want to build a better future for all, helping our customers, communities, people, and the planet to thrive. It’s a big job and we’ve got a long way to go, so we need help from passionate and skilled people, committed to making a difference and getting us to where we want to be in the years and decades to come.

Learn more about our purpose and values

Working at Thames Water

Thames Water is a unique, rewarding, and diverse place to work, where every day you can make a difference, yet no day is the same. As part of our family, you’ll enjoy fast-tracked career opportunities, flexible working arrangements and excellent benefits.

Whether you’re interested in a role in one of our call centres or science labs, we’re looking for people like you with real passion and a burning desire to make things better.

So, if you’re looking for a sustainable and successful career where you can make a daily difference to millions of people’s lives while helping to protect the world of water for future generations, we’ll be here to support you every step of the way. Together, we can build a better future for our customers, our region and our planet.

Real purpose, real support, real opportunities. Come and join the Thames Water family. Why choose us? Learn more.

Our overarching aim is to ensure that Thames Water is great, diverse, and inclusive place to work. We welcome applications from everyone and offer extra support for those who need it throughout the recruitment process. Our aim is to remove any real or perceived barriers to success, so if you need assistance, we’re here to help and support.

When a crisis happens, we all rally around to support our customers. As part of Team Thames, you’ll have the opportunity to sign up to support our customers on the frontline as an ambassador. Full training will be given for what is undoubtedly an incredibly rewarding experience. It’s also a great opportunity to learn more about our business and meet colleagues.

Disclaimer: Due to the high volume of applications we receive, we may close the advert earlier than the advertised date, so we encourage you to apply as soon as possible to avoid disappointment.