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Senior Software Engineer, Systems - Level 3

Job in King of Prussia, Montgomery County, Pennsylvania, 19406, USA
Listing for: Lockheed Martin
Full Time position
Listed on 2026-01-23
Job specializations:
  • Engineering
    Systems Engineer, Software Engineer
Job Description & How to Apply Below

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 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 MK21A program is seeking a dynamic and experienced software engineer to support their development teams. Perspective candidates will:
The MK21 program seeks a motivated, detail‑focused Software Systems Engineer who will integrate system and software designs into a unified product, maintain end‑to‑end traceability, and contribute to test equipment development.

Key Responsibilities
  • Translate system architecture, customer/product requirements, and CONOPS into detailed software requirements and interface definitions.
  • Support verification planning by establishing clear traceability links from architecture through requirements to test artifacts.
  • Leverage cutting‑edge Model Based Systems Engineering (MBSE) tools and processes (e.g., SysML, Magic Draw, Cameo) to create synergistic models that connect verification items, requirements, and design elements.
  • Develop and maintain product and process documentation (CDRLs–Contract Data Requirements List) in accordance with contract requirements.
  • Coordinate design information across the system to ensure consistency and completeness throughout the development lifecycle.
  • Use your excellent communication skills to work across the Lockheed Martin organization and customer/user community to ensure consensus and understanding of solutions.

You have opportunities to play an active role in strengthening the quality of life where we live and work by volunteering more than 850,000 hours annually.

Benefits
  • Medical
  • Dental
  • 401k
  • Paid time off
  • Work/life balance
  • Career development
  • Mentorship opportunities
  • Rewards & recognition
Basic Qualifications
  • Experience in one or more Software Systems Engineering functions, such as:
    • Subsystem design or analysis
    • Systems or software modeling experience
    • Requirements and Software Interface Control Document (ICD) development
  • Ability to obtain secret security clearance.
  • Ability to obtain CompTIA Security+ Certification.
Desired Skills
  • Active Secret Clearance.
  • Systems and/or software engineering experience or relevant systems engineering training through a university or certificate program.
  • Experience with:
    • Software Requirements Development (DOORS experience a plus)
    • SW architecture development
    • Cross‑reference SW architecture to system architecture and design
    • DOD Software CDRL Development
    • Software Model Development with modeling tool such as Cameo or Rhapsody
  • Familiarity with modeling language(s) such as SysML/UML and Architecture Framework(s) such as DODAF.
  • Ability to understand code written in programming languages such as C, C++, MATLAB or Python.
  • Familiar with Agile Development Process.
  • Ability to work 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.
Security Clearance Statement

This position requires a government security clearance; you must be a U.S. 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…

Position Requirements
10+ Years work experience
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