Lead Security Infrastructure Architect

Clearance Required: Eligibility for National Security Vetting

Sector: Critical National Infrastructure

Join a mission-critical organization supporting the UK’s Critical National Infrastructure. We’re looking for a hands-on Security Infrastructure Architect with deep expertise in Microsoft security (Azure, M365, Defender suite) to lead architecture, integration, and technical direction across a broad security stack.

Key Responsibilities:

• Lead architecture and lifecycle of tools like Microsoft Defender XDR, Sentinel, Tenable, SentinelOne, and SOAR/SIEM platforms.
• Design secure, scalable hybrid-cloud infrastructure.
• Act as technical lead and escalation point for engineers and SOC analysts.
• Drive security integration into DevOps and cloud operations.
• Ensure compliance with NIST, ISO 27001, and other frameworks.

Requirements:

• Extensive experience with Microsoft security products.
• Strong background in EDR, SIEM, SOAR, cloud, and network security.
• Excellent communication, documentation, and stakeholder skills.
• Eligible for national security clearance.

Preferred:

• Microsoft and security certifications (e.g. SC-100, CISSP).
• Familiarity with threat modeling and SIEM/SOAR integrations.