Software Engineer Sr - Level 3 (Top Secret)

Lockheed Martin
King of Prussia, PA

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. Were creating future-ready solutions, focusing on resiliency and urgency through our 21st Century Security vision. Were erasing boundaries and forming partnerships across industries and around the world. Were advancing spacecraft and the workforce to fuel the next generation. And were 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.

Generating and simulating operational level plans to explore the art of the possible, how we could defend the ultimate high ground in a future space war
Dynamically optimizing both terrestrial and space-based sensors to provide comprehensive space domain awareness
Strategically optimizing the placement and maneuvering of constellations of satellites to satisfy multiple, evolving priorities

Our team leverages industry standard open-source software solutions such as GitLab, Kubernetes, Docker, and Rancher. Our automation-first and everything as code mindset allows our software engineers to focus their time and efforts on what is most important - building cutting edge functionality for our end users.

As an engineer on an Agile Scrum Team, you will have the opportunity to rapidly develop and deploy solutions for a complex space system following core engineering principles, ultimately enabling the delivery of fully functioning mission capability to end users securely and continuously.
Basic Qualifications:
Recent experience using Java, JavaScript, and Node.js , for full-stack software development
Experience with Git/Gitlab/Git Bash for software version control
Experience with CI/CD - deployment pipelines, automated build, and configuration tools
Experience with application containerization (e.g., Docker, Kubernetes, Helm, Rancher, etc.) in a cloud environment (AWS/Azure/Openstack/Openshift)
Bachelors degree in computer science, computer engineering, another engineering discipline, or equivalent experience
Familiarity with software test best practices, including unit test, integration test, and end-to-end test
Experience working in an Agile development environment, using tools such as Jira and Confluence
Active Top Secret security clearance required to start
Desired Skills:
Three years experience developing software on the Whiskey program
Experience as a maintainer on the Whiskey Program
Active Whiskey program clearance
Experience with API design and development, such as RESTful APIs
Experience with microservices and microservice architecture
Recent JavaScript library experience with web-based components (e.g., Lit, React, Angular)
Experience with Lit for JS front-end
Experience with CesiumJS
Experience with HTML/CSS
Experience with Quarkus for backend Java development
Experience with Helm charts for infrastructure as code (IaC)
Knowledge of database management systems, such as PostgreSQL or MySQL
Familiarity with the Space Domain
Ability to communicate effectively and work in a collaborative environment
Experience in running unit tests with Playwright and/or integration testing with Cucumber
Experience working on large-scale software projects with multiple teams and stakeholders

#LMSpaceSoftwareEng
#SpaceSecurity
#SpaceNSS
Security Clearance Statement: This position requires a government security clearance, you must be a US Citizen for consideration.
Clearance Level: Top 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: 9x80 every other Friday off
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.
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, youre 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 Professional
Business Unit: SPACE
Relocation Available: Possible
Career Area: Software Engineering
Type: Full-Time
Shift: First
Posted 2026-07-24

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