Senior Software Systems Engineer - Level 3

Reference: 733750BRPosted: 2026-06-30Location: King of Prussia, PennsylvaniaClearance: SecretCompany: Lockheed MartinDescription:Space is a critical domain, connecting our technologies, our security and our humanity. While others view space as a destination, we see it as a realm of possibilities, where we can do more — we can innovate, invest, inspire and integrate our capabilities to transform the future. At Lockheed Martin Space, we aim to harness the full potential of space to cultivate innovation, reduce costs, and push the boundaries of what technology can achieve. We’re creating future-ready solutions, focusing on resiliency and urgency through our 21st Century Security vision. We’re erasing boundaries and forming partnerships across industries and around the world. We’re advancing spacecraft and the workforce to fuel the next generation. And we’re re-imagining how space can connect us, ensuring security and prosperity.Join us in shaping a new era in space and find a career that's built for you.The Software Systems Engineer will use Model-Based Systems Engineering (MBSE) methodologies to define, design, and maintain complex system architectures using Cameo Systems Modeler (MagicDraw) and decompose software requirements from systems and component requirements. This role bridges the gap between high-level system requirements and detailed software development, ensuring traceability and consistency across the lifecycle.Basic Qualifications:Experience in systems engineering, software engineering, or related field.•Proven expertise in Cameo Systems Modeler / Cameo Enterprise Architecture or equivalent. • Knowledge of SysML (System Modeling Language) and/or UML (Unified Modeling Language)• US Citizenship required. Final secret clearance needed to start.Desired Skills:• INCOSE Certified Systems Engineering Professional (CSEP) or OMG Certified Systems Modeling Professional (OCSMP).• Demonstrated ability to author clear, concise, and traceable software requirements—including functional, non‑functional, and interface specifications—that align with stakeholder needs and project goals. Experience with DOORS a plus.• Experience in Agile development, Configuration Management, DO-178C.• Experience in aerospace, defense, or complex electronics.• Clearance: Active secret security clearance• Experience DOD Software CDRL Development• Ability to thrive in a fast-paced, synergetic team environment. • Demonstrated behaviors of a systems thinker with the ability to select and apply appropriate systems thinking skills to solve problems and implement constructive change.• Excellent written and verbal communication skills, strong social skills, and ability to build consensus among peers while building solid relationships with team members#LMSpaceSoftwareEng#LMSpaceSystemsEngSecurity Clearance Statement: This position requires a government security clearance, you must be a US Citizen for consideration.Clearance Level: SecretOther Important Information You Should KnowExpression 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: 9x80 every other Friday offLockheed 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.At Lockheed Martin, we use our passion for purposeful innovation to help keep people safe and solve the world's most complex challenges. Our people are some of the greatest minds in the industry and truly make Lockheed Martin a great place to work. With our employees as our priority, we provide diverse career opportunities designed to propel, develop, and boost agility. Our flexible schedules, competitive pay, and comprehensive benefits enable our employees to live a healthy, fulfilling life at and outside of work. We place an emphasis on empowering our employees by fostering an inclusive environment built upon integrity and corporate responsibility.If this sounds like a culture you connect with, you’re invited to apply for this role. Or, if you are unsure whether your experience aligns with the requirements of this position, we encourage you to search on Lockheed Martin Jobs, and apply for roles that align with your qualifications.Experience Level: Experienced ProfessionalBusiness Unit: SPACERelocation Available: PossibleCareer Area: Systems Engineering: OtherType: Full-TimeShift: First