Salary: £15,000 - 20,000 per year Requirements: SC / DV clearance Strong experience in security infrastructure engineering within secure or regulated environments Expertise in Ubuntu / Linux system administration LDAP design and management skills RADIUS / TACACS configuration experience Proven experience supporting the installation, configuration, administration, and support of secure infrastructure solutions Strong understanding and administration of PKI hierarchies Familiarity with security frameworks including NIST CSF, ISO 27001, and MOD Secure by Design (SbD) Experience in virtualisation technologies (VMware ESXi 8, vCentre 8) Network infrastructure knowledge (Cisco IOS-XE, ASA, BGP, VRF/MPLS, VPN, QoS) Clear understanding of JSP 604 / JSP 453 network security engineering compliance Cyber security certifications such as CompTIA Security, GIAC Security Essentials (GSEC), or Systems Security Certified Practitioner (SSCP) are highly desirable Skills in scripting and automation (Python, PHP) are desirable Experience working within large, multi-disciplinary technical teams Knowledge of Cyber Essentials / Cyber Essentials Plus Experience with penetration testing and system security assurance In-date professional registration (e.g., APMG, CIISec) is desirable Delivery experience across Agile (SAFe4) and Waterfall methodologies Knowledge of SCOM is a plus Responsibilities: Support the installation, configuration, administration, and maintenance of secure infrastructure and software components. Work with the Project Manager, Technical Design Architect, and engineering teams to produce system security engineering designs, solutions, and documentation. Act as the primary security engineering conduit between Project Manager, Security Assurance Coordinator, Technical Design Architect, and engineering teams to ensure compliant security solutions. Attend and contribute to regular governance and review meetings, including the Security Working Group. Engage with stakeholders and dependent projects to deliver coordinated security engineering solutions supporting accreditation and registrations. Contribute to the Security Accreditation Plan in coordination with the Project Security Assurance Coordinator. Validate engineering designs against JSP 453 / JSP 604, providing supporting evidence and documentation. Identify security risks, recommend mitigations, and advise on secure design decisions. Provide advice on in-service and emerging cyber security technologies, including cost, risk, and benefits analysis. Technologies: Architect Cisco Support JSP LDAP Linux MPLS Network PHP Project Manager Python Security Ubuntu VPN VMware iOS More: We are seeking a Security Infrastructure Engineer to join our dynamic Security Team, located in Corsham. This is a hybrid role offering between £500 and £580 per day, and it requires SC / DV clearance. You will work closely with project managers, technical architects, and engineering teams to deliver compliant and secure infrastructure solutions in a complex defense environment. We pride ourselves on fostering a collaborative atmosphere and providing opportunities for professional growth. last updated 4 week of 2026