Senior Software Engineer (Top Secret Clearance)

Reference: 720814BRPosted: 2026-07-07Location: King of Prussia, PennsylvaniaClearance: Top Secret with Investigation or CV date within 5 yearsCompany: Lockheed MartinDescription:Lockheed Martin’s Victor Portfolio of Space Security is seeking a highly skilled, motivated, and experienced Senior Software Engineer to join an Agile, cross‑functional team dedicated to protecting critical space assets. This role will focus on developing web‑based applications within an open‑architecture infrastructure that supports mission‑critical space‑security operations. The successful candidate will collaborate with internal development teams and subject‑matter experts, and thrive in a fast‑paced environment where each day brings new challenges.Key Responsibilities• Full‑Lifecycle Development – Design, implement, test, deploy, and maintain web applications and services that enable space‑asset protection.• Agile Collaboration – Participate in Scrum ceremonies (stand‑ups, sprint planning, retrospectives) and contribute to continuous‑improvement of team processes.• Open‑Architecture Integration – Build modular, reusable components that conform to open‑architecture standards and facilitate integration with existing and future mission systems.• Technical Leadership – Mentor junior engineers, conduct code reviews, and drive adoption of best practices (CI/CD, automated testing, secure coding, performance profiling).• Stakeholder Engagement – Work closely with domain experts to translate mission needs into technical solutions.Applicants selected will be subject to a government security investigation and must meet eligibility requirements for access to classified information, and must maintain the required security throughout the course of employment.Basic Qualifications:• Proficiency in modern languages such as Java, C#, Python, or JavaScript/TypeScript; strong understanding of object‑oriented design and principles.• Hands‑on experience with RESTful APIs, HTML5, CSS3, modern JavaScript frameworks (e.g., React, Angular, Vue), and UI/UX best practices.• Familiarity with pipelines (Jenkins, GitLab CI, Azure DevOps), containerization (Docker, Kubernetes), and version control (Git).• Proven track record working in Scrum or Kanban teams; comfortable with iterative development and rapid feedback cycles.• US citizenship is required to obtain a government security clearance• Active DOD Top Security Clearance with an investigation or Continuous Vetting (CV) date within 5 yearsDesired Skills:• Experienced with Horizon software application providing command and control services for satellites, antennas, and ground hardware assets.• Experience in application containerization (e.g. Docker, Kubernetes, Helm, etc.) in a cloud environment (AWS/Azure/Openstack/Openshift)• Hands‑on experience with RESTful APIs, HTML5, CSS3, modern JavaScript frameworks (e.g., React, Angular, Vue), and UI/UX best practices.• Domain Experience in Mission Management, Planning and Scheduling, Orbital Mechanics, SSA (Space Situational Awareness)#LMSpaceSoftwareEng#SpaceSecurity#SpaceNSSSecurity Clearance Statement: This position requires a government security clearance, you must be a US Citizen for consideration.Clearance Level: Top Secret with Investigation or CV date within 5 yearsOther 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: Software EngineeringType: Full-TimeShift: First