Cyber Operations Manager

Sizewell C Limited; Greater London; Hybrid; GBP 70,000 - 94,000; Full time

Benefits offered by this job

Annual leave 28–30 days

5% annual bonus

Pension contributions

Job summary

Sizewell C Limited is seeking a Cyber Operations Manager based in London on a hybrid basis with travel to Suffolk. The role is permanent and full-time, with a salary of £82,000 per year plus benefits.

You will lead day-to-day cyber security operations, oversee monitoring and incident response, and work with internal teams and external providers to protect critical systems. The position offers flexible hybrid working and a competitive package.

Qualifications

• Experience leading cyber operations in large, complex orgs.
• Experience managing third-party security providers and service delivery.
• Knowledge of cyber security frameworks (NIST, ISO27001, CIS, IEC 62443).
• Strong leadership and stakeholder management skills.
• Ability to prioritise tasks under high-pressure conditions.

Responsibilities

• Oversee day-to-day cyber security operations in a regulated, safety-critical environment.
• Manage security monitoring, threat detection, vulnerability management, and incident response coordination.
• Coordinate with Cyber Security, Infrastructure, Digital, OT, and vendors to ensure effective controls.
• Contribute to operational cyber resilience across the organisation.

Skills

Cyber security operations

Third-party security mgmt

Security frameworks

Leadership & stakeholder mgmt

Prioritization under pressure

Tools

SOC processes

SIEM

EDR

Monitoring platforms

Job description

London, GB, EC2R 7BP Bristol, GB, BS32 4TP Manchester, GB, M1 4HN Felixstowe, GB, IP10 0DD Leiston, GB, IP16 4EW

Career Area: Data, Tech & IT

Cyber Operations Manager

Sizewell C’s business is to design, finance, construct, commission, operate, maintain, and eventually decommission the nuclear power plant and related infrastructure at Sizewell C in Suffolk. Overall, whilst the Company is in the construction phase, the Boards’ principal focus is on the development and construction of Sizewell C on time, on budget and to the highest quality and safety standards. The Company is maturing to meet all these requirements.

Sizewell C is economically regulated by OFGEM under the Regulated Asset Base (RAB) model similar to other UK electricity distribution networks and Thames Tideway.

Sizewell C construction strategy is to replicate the design of Hinkley Point C, using the majority of the same supply chain, but innovating in the way it is delivered to achieve savings in time and cost of around 20%. The CCO will need to be guided by and incorporate lessons learned from the Hinkley Point C commercial delivery to achieve Sizewell C’s ambition.

Following Financial Completion and Revenue Commencement, Sizewell C is fully funded and is owned by; The Secretary of State for Energy Security and Net Zero representing HM Government, La Caisse, Centrica, EDF and Amber Infrastructure.

Sizewell C is entering an exciting phase of growth as we mature into an independent organisation and continue building one of the UK’s largest and most important energy projects. We are now recruiting the below position.

Cyber Operations Manager

Location:Based in London on a hybrid basis with travel to Suffolk as required.

Contract: Permanent, full-time.

Salary: £82,000 per annum,dependant on experience,plus benefits.

Benefits include:

• Annual Leave: 28 days per annum, increasing to 30 days after 5 years of service, plus bank holidays.
• Bonus:5% annual bonus.
• Pension Contributions: Defined Contribution Pension Scheme with up to 7.5% employee contribution 15% employer contribution.

ClosingDate: Monday 21st September 2026

Sizewell C is entering an exciting phase of growth as we mature into an independent organisation and continue building one of the UK’s largest and most important energy projects.

About the Role

We are seeking an experienced Cyber Operations Manager to oversee day-to-day cyber security operations within a highly regulated and safety-critical environment.

You will be responsible for managing security monitoring, threat detection, vulnerability management, incident response coordination, and operational cyber resilience activities across the organisation. Working closely with Cyber Security, Infrastructure, Digital, Operational Technology, and third-party providers, you will ensure that cyber security controls and services operate effectively to protect critical systems and data.

This role offers the opportunity to contribute to a nationally significant infrastructure programme where operational resilience and cyber defence are essential.

About You

• Proven experience managing cyber security operations or security operations teams within large, complex organisations
• Experience managing third-party cyber security providers and operational service delivery
• Knowledge of cyber security frameworks such as NIST, ISO27001, CIS, or IEC 62443
• Strong leadership, stakeholder management, and communication skills
• Ability to manage competing priorities within high-pressure operational environments

Strong understanding of:

• Security Operations Centre (SOC) processes and technologies
• SIEM, endpoint detection, and security monitoring platforms
• Threat detection, threat intelligence, and incident response
• Vulnerability management and cyber hygiene practices
• Network, infrastructure, cloud, and endpoint security
• Cyber security operational governance and risk management

Why Join Us?

• Be part of one of the most important low-carbon energy projects in the UK.
• Work in a mission-driven environment that values innovation, integrity, and long-term sustainability.
• Competitive salary, comprehensive benefits, and opportunities for career development.
• Flexible and hybrid working options.

Behavioural Competences

Humility

• Recognise the value brought fromdifferent culturesand experiences
• Be open to other’s points of view and ideas, be willing to debate and to compromise

Positivity

• Positively challengepoor qualityand performance
• Identifysolutions at the lowest possible level
• Encourage tier 1s and others to bringnew ideasforward

Respect

• Value the rules and environment in which we operate
• Give and receive feedback with respect
• Embrace and engage with new people and ideas
• One team, working closely together and helping each other
• Empowered teams always looking forward.
• Shared responsibility for delivery the project outcomes

Clarity

• Communicate clearly and consistently
• Promote collaboration and team alignment
• Drive simplification at all levels

When joining Sizewell C, you may wonder why you are contacted by colleagues with an EDF email or see the EDF logo on portals that you access and/or documentation you receive; this is because we have partnered with EDF for the provision of a number of support services whilst we complete a successful transition out of the EDF group.

At Sizewell C we encourage and embrace diversity and how it can improve our experience and performance at work.It is a requirement that those who join us have the right to work in the UK. Whilst sponsorship may be a possibility that we can explore, we are fully committed to local recruitment where possible, and those already holding the right to work in the UK.

To be appointed to this role, you will need to meet the criteria for Security Vetting, which will, ordinarily, require you to have been a resident of the UK for at least three of the past five years.