Overview

Location: Aldermaston - Onsite 1-2 days per week.

We are seeking a DV Cleared OT Cyber Security Engineer with strong expertise in Secure by Design (SbD) principles to join a high-profile Defence programme. This is a critical role ensuring that Operational Technology (OT) environments are protected against evolving cyber threats while remaining resilient, safe, and compliant with security standards.

The successful candidate will be responsible for designing, implementing, and reviewing OT security controls across complex systems, supporting both engineering and assurance activities.

Responsibilities

• Apply Secure by Design principles throughout the engineering lifecycle.
• Conduct threat modelling, risk assessments, and security design reviews for OT environments.
• Work closely with engineering and project teams to embed security into delivery.
• Produce and review security documentation in line with MOD/Defence standards.
• Provide SME input on OT security to stakeholders across projects.

Essential Skills & Experience

• Active UK DV Clearance (mandatory).
• Security Practitioner
• Strong background in Operational Technology.
• Demonstrable experience applying MOD/Nuclear Secure by Design (SbD) principles.
• Proven experience in security architecture and engineering within Defence or Critical National Infrastructure.
• Knowledge of risk management methodologies and security assurance.

Desirable Skills

• Experience with IEC/ISA 62443 standards.
• Familiarity with NIST 800-82, ISO 27001, and Defence Security standards (e.g., JSPs).
• Previous MOD/Defence and or Nuclear experience.

Due to the nature and urgency of the role, candidates are required to hold current Developed Vetting (DV) clearance. If you do not hold this, we cannot sponsor. Please familiarise yourself with the security vetting process before applying.