Senior Cyber Security Analyst

Medirest Signature; Reading; Hybrid; GBP 60,000 - 70,000; Full time

Job summary

A leading company in the water and wastewater sector seeks a Senior Cyber Security Analyst to bolster its cyber defenses and response strategies. The role includes monitoring threats, optimizing tools, engaging stakeholders, and supporting compliance initiatives. It offers a competitive salary, significant benefits, and a chance to directly impact public health and safety.

Benefits

Annual Leave - 26 days holiday plus bank holidays

Generous Pension Scheme through AON

Health and wellbeing benefits including physiotherapy

Cycle to Work schemes

Qualifications

• Experience in a technical cybersecurity role, ideally within a large enterprise.
• Experience working in or with a Security Operations Centre (SOC).
• Structured approach to incident triage and issue resolution.

Responsibilities

• Investigate and respond to security incidents.
• Monitor and enhance SecOps tool performance.
• Engage with stakeholders to communicate cyber risks.

Skills

Incident management

Threat hunting

Stakeholder engagement

Cyber risk remediation

Tool optimisation

Education

Degree in Cyber Security, Computer Science, or related field

Tools

Microsoft Sentinel

PAM

EDR/XDR systems

Job description

As a Senior Cyber Security Analyst, you will play a critical role in strengthening Thames Water’s digital defences by maintaining and optimising security operations tools and processes. You’ll focus on monitoring, analysing, and responding to cyber threats, while supporting the SOC team and ensuring effective incident management across the business.

Your role will involve collaborating with technology and business stakeholders, investigating security alerts, enhancing tooling performance, and supporting the delivery of continuous improvement and risk reduction initiatives. You’ll also contribute to readiness for significant incidents and play a key role in proactive threat hunting and compliance reporting.

What you’ll be doing as a Senior Cyber Security Analyst:

• Security Incident Response: Investigate security alerts from SIEM and third-party MSSPs, triage and respond to incidents, and support root cause analysis to drive remediation.
• Stakeholder Engagement: Work closely with technology and business teams to communicate cyber risks, recommend actions, and ensure proportionate implementation of controls.
• Tool Performance & Optimisation: Monitor and enhance the performance of SecOps tools such as Microsoft Sentinel, PAM, and EDR/XDR systems, including alert tuning and automation.
• SOC Support & Escalation: Act as a key contact and escalation point for the SOC team, providing guidance and mentoring to support operational effectiveness.
• On-Call & Incident Readiness: Participate in a 24/7/365 on-call rota with our MSSP partners, supporting out-of-hours investigations and maintaining incident readiness.
• Threat Hunting & Continuous Improvement: Perform proactive threat hunting, recommend new security controls, and contribute to continuous improvement of SecOps processes.
• Compliance & Documentation: Maintain security documentation, support GDPR, NIS, and ISO 27001 compliance, and collect metrics to report on operational effectiveness and risk posture.

Base Location: Hybrid – With travel to Thames Water offices 2 days per week
Working Pattern: Full Time / 36 Hours per week

What you should bring to the role:
Essential Experience:

• Experience in a technical cybersecurity role, ideally within a large enterprise
• Experience working in or with a Security Operations Centre (SOC)
• Structured approach to incident triage and issue resolution
• Experience remediating cyber risks in complex digital environments
• Working with third-party security partners or MSSPs

Essential Technical Skills & Qualifications:

• Strong knowledge of IT infrastructure, networking, and end-user computing
• Experience with SIEM tools, particularly Microsoft Sentinel
• Ability to write and tune Kusto Query Language (KQL) queries
• Hands-on experience with PAM, MFA, and other SecOps tools
• Excellent communication skills with the ability to explain technical issues to non-technical stakeholders

Desirable Skills & Qualifications:

• Microsoft Security certifications (e.g. SC-200, AZ-900)
• Cybersecurity certifications such as CISSP, CISM, or CCS
• Degree in Cyber Security, Computer Science, or related field
• Familiarity with firewalls, IDS/IPS, VPNs, and NAC
• Experience mentoring or leading SOC analysts

What’s in it for you?

• Salary range up to £70,000 per annum.
• 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.