Defence Security by Design Consultant (60-day Contract)

Marks Sattin; Yeovil; Hybrid; GBP 111,000 - 166,000; Full time

Job summary

Marks Sattin is seeking an experienced Security by Design Consultant in Yeovil, Somerset, for a 60-working-day contract between November 2026 and 31 March 2027. The role requires active UK MOD SC clearance and a strong background in defence cyber security, security management, and ISN standards.

The consultant will produce a Security Management Plan, identify security gaps, and design a sequenced remediation plan, working 40% onsite in Yeovil with regular stand-ups and close governance with the

Qualifications

• Minimum seven years' experience delivering cyber security in UK defence.
• Experience producing detailed Security Management Plans.
• Strong knowledge of MOD accreditation and Secure by Design.
• Familiar with Defence Standard 05-138 and ISN 2023/09.
• Active UK MOD SC clearance is required.

Responsibilities

• Produce a comprehensive Security Management Plan covering the programme's systems, services, assets and security perimeter.
• Identify critical and high-priority security gaps affecting service delivery.
• Develop a high-level remediation plan with ownership, timescales, cost and complexity.
• Define system dependencies, external connections and codes of connection.
• Support security governance and risk management across the service lifecycle.
• Build relationships with programme, customer and security stakeholders.
• Transfer security knowledge across the wider programme team.

Skills

Security by Design

MOD SC clearance

Security governance

Defence cyber security

Education

Degree in cyber security / systems engineering / software engineering

Job description

Marks Sattin is seeking an experienced Security by Design Consultant in Yeovil, Somerset, for a 60-working-day contract between November 2026 and 31 March 2027. The role requires active UK MOD SC clearance and a strong background in defence cyber security, security management, and ISN standards.

The consultant will produce a Security Management Plan, identify security gaps, and design a sequenced remediation plan, working 40% onsite in Yeovil with regular stand-ups and close governance with the