Cyber Systems Security Engineer Sr

Cyber Systems Security Engineer (CSSE) – TTWCS Program

At Lockheed Martin Rotary and Mission Systems, we are shaping the future of defense and security through innovation, integrity, and visionary thinking. Our teams apply the highest standards of business ethics and technical expertise to design solutions that safeguard our nation and allies. Every day, we push boundaries to ensure mission success—and we invite you to be part of this critical work.

As a Cyber Systems Security Engineer (CSSE) supporting the TTWCS program, you will:

• Perform periodic manual and automated STIG evaluations, tracking deltas across versions and platforms.
• Conduct cyber risk assessment activities, including threat modeling, vulnerability analysis, and evaluation of mitigation strategies.
• Develop, analyze, and validate security AI design constraints within the cyber domain.
• Collaborate with cybersecurity engineers, system architects, and developers to ensure robust, secure system solutions.
• Conduct cybersecurity test and evaluation of hardware and software to verify compliance with requirements.
• Apply and ensure consistent use of cybersecurity processes, methods, techniques, and tools.
• Prototype and implement software solutions supporting assessment and authorization activities required by customers.

This position requires the ability to obtain and maintain a DoD government clearance at the Secret level.

This position is based out of King of Prussia, PA and is hybrid but required to work onsite 3 days a week.

This position requires the ability to travel up to 10%.

We are Lockheed Martin, a global security and aerospace leader. Our Rotary and Mission Systems (RMS) business area delivers solutions that connect people, protect freedom, and advance the state of technology in areas such as naval systems, radar, cyber, and missile defense.

You are a mission-driven engineer with a strong background in cybersecurity and systems engineering. You thrive in collaborative environments and are passionate about applying your skills to safeguard systems against evolving threats. Your ability to assess risks, develop secure designs, and validate solutions makes you a trusted partner in ensuring mission success.

At Lockheed Martin, your skills, training, and education are valued—and your future is limitless. You'll join a team that empowers innovation, supports professional growth, and makes a tangible impact on global security. From day one, you'll be part of something bigger: protecting what matters most.

Basic Qualifications

• Bachelor's degree in a related field with 5+ years of relevant experience.
• Experience with Linux and Windows operating systems.
• Experience with AI/ML/DL for cyber analysis and auditing.
• Experience with vulnerability scanning and/or patching
• Sec+ Certification.
• Base understanding of Risk Management Framework, (RMF) NIST SP 800-53.
• This position requires the ability to obtain and maintain a DoD government clearance at the Secret level.
• This position requires the ability to travel up to 10%.

Desired Skills

• Masters degree in a relevant field.
• Experience using STIG and vulnerability management tools such as EvaluateSTIG and ACAS
• Experience with employment of DoD Cyber requirements, policies, and processes, to include certification and accreditation as part of DIACAP or RMF
• Ability to provide status and communicate effectively within the Cyber Security Engineering team and related disciplines (Software, Systems, Test).
• Experience in Systems Engineering and requirements decomposition
• Previous experience with Agile teams, DevSecOps, SW Development, or some other digital transformation technology
• Possess an approved DoD 8570 baseline certification for IAT Level II (CISSP, CAP, etc.)
• Knowledge of Windows Operating Systems
• Knowledge of Linux Operating Systems Administration (Ubuntu and RedHat)
• Experience in networking configuration, security configuration, and protocols
• Knowledge of Application Security and SRGs.
• Technical curiosity to learn new skills and are ready to help across the team.

Security Clearance Statement: This position requires a government security clearance, you must be a US Citizen for consideration.

Clearance Level: Secret

Other Important Information You Should Know

Expression of Interest: By applying to this job, you are expressing interest in this position and could be considered for other career opportunities where similar skills and requirements have been identified as a match. Should this match be identified you may be contacted for this and future openings.

Ability to Work Remotely: Onsite Full-time: The work associated with this position will be performed onsite at a designated Lockheed Martin facility.

Work Schedules: Lockheed Martin supports a variety of alternate work schedules that provide additional flexibility to our employees. Schedules range from standard 40 hours over a five day work week while others may be condensed. These condensed schedules provide employees with additional time away from the office and are in addition to our Paid Time off benefits.

Schedule for this Position: 4x10 hour day, 3 days off per week

Lockheed Martin is an equal opportunity employer. Qualified candidates will be considered without regard to legally protected characteristics.

The application window will close in 90 days; applicants are encouraged to apply within 5 - 30 days of the requisition posting date in order to receive optimal consideration.