> Markdown version of [/jobs/ext/1155735-senior-software-engineer-level-3-ts-sci-with-poly](https://www.wearedevelopers.com/jobs/ext/1155735-senior-software-engineer-level-3-ts-sci-with-poly). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Software Engineer - Level 3 (TS/SCI with Poly) - **Company:** Lockheed Martin - **Location:** King of Prussia, PA, United States (Remote available) - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Java (Programming Language), Agile Methodology, Software Applications, Systems Engineering, C Sharp (Programming Language), Code Review, Collaborative Software, Continuous Integration, Software Debugging, Integrated Development Environments, Object-Oriented Software Development, Scrum Methodology, Release Management, Software Engineering, Software Systems, Systems Integration, Orbital Mechanics, Gitlab, Git, Information Technology - **Published:** July 1, 2026 - **Apply:** https://www.lockheedmartinjobs.com/job/king-of-prussia/senior-software-engineer-level-3-ts-sci-with-poly/694/97146080864 ## About the Role * Bachelor's degree in Computer Science, Software Engineering, Aerospace Engineering, Applied Physics, Mathematics, or a related technical discipline, or equivalent experience. * Experience with software design, implementation, debugging, and testing using C#, Java, or similar object-oriented programming languages. * Experience working in a collaborative software development environment. * Strong problem-solving, communication, and teamwork skills. * Desire to learn mission planning concepts and contribute to the development of operational mission software. * Familiarity with Agile software development methodologies. * Active TS/SCI security clearance with favorable polygraph adjudication and ability to maintain the required clearance. U.S. Citizenship required. Desired Skills: * Knowledge of satellite mission planning, spacecraft operations, or related space-domain applications. * Knowledge of orbital mechanics, astrodynamics, or aerospace systems. * Experience with modern software development tools, including Git, GitLab, and CI/CD pipelines. #LMSpaceSoftwareEng #SpaceSecurity #SpaceNSS Security Clearance Statement: This position requires a government security clearance, you must be a US Citizen for consideration. Clearance Level: TS/SCI w/Poly, Ability to Work Remotely: Onsite Full-time: The work associated with this position will be performed onsite at a designated Lockheed Martin facility. ## Description Description: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 reimagining 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 We're seeking a talented and motivated Senior Software Engineer to join our fast-paced development effort and contribute to the success of a very challenging and rewarding mission. In this position, you will: * Collaborate with a team of software engineers to develop, enhance, and sustain satellite mission planning capabilities. * Design, develop, test, and maintain software applications supporting mission planning and spacecraft operations. * Implement software features and resolve defects in accordance with program requirements and software development best practices. * Work closely with systems engineers, operators, and senior engineers to understand mission planning requirements and translate them into software solutions. * Participate in software design reviews, code reviews, and technical discussions. * Support software integration, testing, troubleshooting, and deployment activities. * Participate in Agile development activities including sprint planning, daily scrums, demonstrations, retrospectives, and release planning. * Develop knowledge of satellite mission planning concepts, operational workflows, and mission planning algorithms. ## Related Videos - [Are Code Reviews Worth It? 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