We are looking for a security-focused, results-oriented individual who thrives in a collaborative, team-focused culture. You will work closely with IT and OT network managers, suppliers, business stakeholders, service owners, and your team to ensure the delivery of secure, reliable, and resilient network services across Thames Water.
We are seeking a Network Security Manager to lead and manage the end-to-end BAU (Business As Usual) service delivery for network security across Operational Technology (OT) and Information Technology (IT). You will be responsible for maintaining robust security controls, managing suppliers, mitigating operational risk, and ensuring compliance with industry standards to protect Thames Water’s critical infrastructure.

ESSENTIAL EXPERIENCE:

• Ability to gain SC Clearance.
• IT and OT network security experience.
• Strong interpersonal skills and stakeholder engagement capability.
• Proven problem-solving and decision-making skills.
• Experience with delivery methodologies (ITIL, waterfall, agile, lean).
• Ability to explain complex network issues simply and effectively.

ESSENTIAL TECHNICAL SKILLS & QUALIFICATIONS:

• CCNP, CCNA or equivalent experience CheckPoint CCSE, CCSA or equivalent experience.Proficiency in Layer 2/3 technologies (VLAN, RSTP, BGP, MRP) across vendors (Cisco, Meraki, Belden, Fortinet).
• Experience with network edge security (SDWAN, IPSEC) using tools like Cisco ISE, CheckPoint, and Umbrella.
• Higher education qualification or equivalent experience in engineering.
• Skills in stakeholder management, communication, and strategic decision-making.

DESIRABLE EXPERIENCE:

• Previous experience in utilities or large-scale enterprises (20,000+ devices).
• Commercial acumen and change management experience.
• Ability to simplify complex network architecture for non-technical audiences.

DESIRABLE TECHNICAL SKILLS & QUALIFICATIONS:

• Knowledge of network security technologies and strategic supplier management.
• Experience in stakeholder analysis and business case development.
• Familiarity with cloud integration (Azure and AWS).

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.

Please refer the Job description for details