Information Security Engineer - Classified Systems

Reporting to the EMEA Information Security Officer, the Information Security Engineer will be responsible for the security engineering, accreditation, and lifecycle assurance of classified and sensitive IT systems. The role will support the design, implementation, operation, and continuous improvement of secure IT environments, ensuring compliance with UK Government, MoD, and Lockheed Martin security requirements.

The successful candidate will work closely with programme teams, architects, infrastructure engineers, accrediting authorities, and information assurance stakeholders to ensure security is embedded throughout the system lifecycle., * Lead the implementation of Secure by Design principles across classified IT systems and projects.

• Provide security engineering expertise throughout the system development and operational lifecycle, ensuring security requirements are identified and implemented from concept through disposal.
• Conduct security architecture reviews, threat assessments, and technical risk analysis for classified environments.
• Support the development and maintenance of system security documentation, security architectures, and security operating procedures.
• Lead and coordinate system accreditation activities for classified and sensitive systems.
• Develop and maintain accreditation artefacts including Risk Management and Accreditation Documentation Sets (RMADS), Security Cases, Security Management Plans, and supporting evidence.
• Work with Accreditors, Security Controllers, and customer security representatives to obtain and maintain Authority to Operate (ATO) approvals.
• Ensure continued compliance with applicable regulatory, contractual, and customer security requirements throughout system operation.
• Identify, assess, and mitigate cybersecurity risks within classified IT environments.
• Conduct security assessments, vulnerability reviews, and compliance audits against corporate and government security standards.
• Support risk treatment planning and remediation activities.
• Ensure alignment with NCSC, MoD, JSP, NIST, and Lockheed Martin security policies and standards where applicable.
• Support incident response investigations affecting classified systems.
• Assist with vulnerability management, patch management, and security monitoring activities.
• Participate in security reviews and technical investigations to identify root causes and corrective actions.
• Provide technical guidance to system administrators and engineering teams on security controls and best practices.
• Collaborate with programme managers, solution architects, IT teams, information assurance practitioners, and customer representatives.
• Provide security guidance to project teams during system design, implementation, and operational support phases.
• Support customer and regulatory audits and inspections., Lockheed Martin is committed to upholding principles of equal opportunity, fostering a work environment that is aligned with our core values of integrity, respect, and exceptional performance. We recognize the importance of leveraging the unique talents and experiences of all our employees to drive innovation, deliver superior solutions, and maximize value for our customers. Our focus is on identifying the most qualified candidate for each role, regardless of their background. If you are interested in a position, we invite you to share how your skills and perspectives could bolster our team and encourage you to apply, even if you feel your qualifications do not fully meet all the job criteria outlined in our advertisement. Furthermore, Lockheed Martin is dedicated to ensuring our recruitment process is inclusive for all individuals. We are prepared to accommodate reasonable adjustments for applicants as needed. If you require assistance or adjustments to participate in the job application or interview process, please contact recruitment@global.lmco.com.

• Strong understanding of Microsoft Windows Server, Linux operating systems, virtualisation technologies, and enterprise networking.
• Experience securing classified, air-gapped, or highly regulated IT environments.
• Knowledge of cloud security principles including AWS, IaaS, and PaaS technologies where applicable.
• Familiarity with security technologies including endpoint protection, SIEM, vulnerability management, encryption, and identity management solutions
• Demonstrable experience applying Secure by Design principles in complex IT systems and programmes.
• Experience conducting security architecture reviews, threat modelling, and risk assessments.
• Strong understanding of system hardening, security controls implementation, and security testing methodologies.
• Experience supporting system engineering and security requirements management within regulated environments.

Accreditation & ATO Experience

• Proven experience developing accreditation evidence and security assurance documentation.

• Experience obtaining and maintaining Authority to Operate (ATO) approvals for classified or regulated systems.

• Knowledge of UK Government and MoD accreditation processes and assurance frameworks.

• Experience working directly with accrediting authorities, security controllers, or customer assurance organisations.

• Excellent written and verbal communication skills.

• Ability to communicate technical security concepts to both technical and non-technical stakeholders.

• Strong analytical and problem-solving skills.

• Ability to work independently while supporting multiple programmes and stakeholders.

• CISSP, CISM, or equivalent Information Assurance certification.

• Degree in Cyber Security, Information Security, Computer Science, Engineering, or a related discipline.

• Experience within Defence, Aerospace, Government, or National Security sectors.

Additional Requirements

• Knowledge of UK Government Security Policy Framework (SPF), NCSC guidance, JSP 440, and Defence security requirements.
• Understanding of GDPR and UK Data Protection Act requirements where applicable.
• Ability to obtain and maintain UK Security Check (SC) clearance with willingness and eligibility to achieve Developed Vetting (DV) clearance.
• Occasional UK and EMEA travel may be required.

Pulled from the full job description

• Employee discount
• Employee assistance programme
• Company pension
• Private medical insurance
• Enhanced maternity leave, At Lockheed Martin our employees come first and therefore your physical, mental and financial wellbeing matters to us. On top of working in a highly supportive, friendly, respectful environment you can expect so much more.

We are an employer in support of and offering Flexible working with the option to also work a 4 day week depending on business requirements, where you have the option of Fridays off. We offer Competitive salaries alongside a flexible holiday entitlement.

We have a Wealth of benefits available to you that can be selected through our wellbeing tool upon commencement of employment. Just a few of our amazing benefits are shown below:

• Private Medical Insurance
• Competitive Pension
• Dental
• Critical Illness
• Life Assurance
• Travel Insurance
• Employee discounts for top high street shops
• Employee Assistance Program which includes free face to face counseling sessions, Legal advice, Financial advice, etc
• Internal training and development alongside our Education assistance programmes
• Reimbursement for a professional membership
• Competitive policies that support flexibility and family leave inclusive of enhanced maternity leave

Business Environment Enterprise Business Services (EBS) consists of LMUK IT Services, Payroll, ESH, HR and Finance functions. With employees located throughout the UK, EBS provides UK wide support to the LMUK business areas.