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14 senior software engineer level 3 jobs found

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United States senior software engineer level 3 Pennsylvania
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Lockheed Martin
Jul 02, 2026
Senior Software Engineer - Level 3 (TS/SCI with Poly)
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. 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...
Lockheed Martin
Jun 02, 2026
Senior Software Engineer - Level 3 (TS/SCI with Poly)
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. 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...
Lockheed Martin
Jul 02, 2026
Senior Software Systems Engineer - Level 3
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. 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)...
Lockheed Martin
Jul 14, 2026
Systems Engineer SEIT Lead
Lockheed Martin King of Prussia, PA
Description: WHO WE ARE: Lockheed Martin Rotary and Mission Systems has an opportunity for a Systems Engineering Integration and Test (SEIT) Lead for operational systems within the Ground Cyber Electronic Warfare portfolio. The successful candidate will be an engineering leader to oversee operations and maintenance for complex software-defined RF system installations in OCONUS/CONUS locations. Ability to travel to OCONUS locations several times throughout the year is desired for this position. THE WORK: The SEIT Lead would maintain and enhance the engineering baseline, develop testing strategies for upgrades, and oversee the change management process including chairing engineering review boards. The candidate must develop a deep technical knowledge of all aspects of the system architecture in order to identify change impacts due to obsolescence as well as guide paths to expanded capabilities for growth opportunities. As a technical leader, the candidate will be a primary...
Lockheed Martin
Jul 10, 2026
Senior Software Engineer
Lockheed Martin King of Prussia, PA
Description: WHAT WE'RE DOING Come join the CommandIQ® (CIQ) team – a product line established in 2025 with sizable investment and support from RMS senior leadership. We are developing mission critical Battle Management and Command & Control capabilities for a complete Command and Control mission suite. Our solution provides the open architecture as well as mission apps that can be customized to each user’s needs. Customers can also easily integrate their favorite tools into a single CommandIQ® Common Operating Picture (COP) to meet their own, specialized mission requirements. Join us and become a part of the team that is actively designing and developing the initial baseline which has already generated significant customer interest both domestically and internationally! Check out these links for more information about our exciting suite of products: https://www.lockheedmartin.com/en-us/products/command-and-control.html https://www.youtube.com/watch?v=mYu06sRV398 THE WORK...
Lockheed Martin
Jul 10, 2026
Sr. Staff Engineering Program Manager - Top Secret Clearance Required
Lockheed Martin King of Prussia, PA
Description: WHAT WE'RE DOING The U-2S aircraft provides high-altitude, all-weather surveillance and reconnaissance, day or night, in direct support of U.S. and allied forces. It delivers critical imagery and signals intelligence to decision makers throughout all phases of conflict, including peacetime indications and warnings, low-intensity conflict, and large-scale hostilities. Lockheed Martin (LM) provides the engineering disciplines to continually improve the avionics and ISR systems employed on the U-2S. The Aero Palmdale, Aero Fort Worth and RMS Valley Forge sites are actively involved in supporting upgrades to the U-2 platform capabilities. WHO WE ARE The LM Valley Forge site Datalinks Team is currently supporting the following upgrades on the aircraft: • Integrating a Tactical Data Link (Link 16) on the U-2S and developing the Pilot Vehicle Interface (PVI) for Link 16 radio control and tactical situational awareness, Electronic Warfare (EW) situational...
Lockheed Martin
Jul 03, 2026
Systems Engineer, Lead
Lockheed Martin King of Prussia, PA
Description: Who We Are: Want to work with cutting-edge technologies in a fun, fast-paced, and dynamic environment? Are you a problem solver that takes on challenges that others think are impossible? If you answered yes to these questions, then we invite you to join Lockheed Martin Rotary and Missions Systems (RMS) as a Senior Systems Engineer! Lockheed Martin is a global leader in aerospace, defense, and technology solutions. You will be joining Lockheed Martin Rotary and Mission Systems About Rotary and Mission Systems Our team in Strategic Spectrum Solutions consists of a variety of engineering disciplines that work together to execute design, development, integration and test of systems and have expertise in Software Defined Radios (SDR), digital signal processing (DSP), GNSS constellation simulation, and signal transceivers. Our team members build strong relationships with one another, founded on trust, open communication, and a sense of camaraderie. This leads to a...
Lockheed Martin
Jul 02, 2026
Senior Systems Engineer
Lockheed Martin King of Prussia, PA
Description: Who We Are: Want to work with cutting-edge technologies in a fun, fast-paced, and dynamic environment? Are you a problem solver that takes on challenges that others think are impossible? If you answered yes to these questions, then we invite you to join Lockheed Martin Rotary and Missions Systems (RMS) as a Senior Systems Engineer! Lockheed Martin is a global leader in aerospace, defense, and technology solutions. You will be joining Lockheed Martin Rotary and Mission Systems About Rotary and Mission Systems Our team in Strategic Spectrum Solutions consists of a variety of engineering disciplines that work together to execute design, development, integration and test of systems and have expertise in Software Defined Radios (SDR), digital signal processing (DSP), GNSS constellation simulation, and signal transceivers. Our team members build strong relationships with one another, founded on trust, open communication, and a sense of camaraderie. This leads to a...
Lockheed Martin
Jul 02, 2026
Senior Software Engineer
Lockheed Martin King of Prussia, PA
Description: Who We Are: Want to work with cutting-edge technologies in a fun, fast-paced, and dynamic environment? Are you a problem solver that takes on challenges that others think are impossible? If you answered yes to these questions, then we invite you to join Lockheed Martin Rotary and Missions Systems (RMS) as a Senior Software Engineer! Lockheed Martin is a global leader in aerospace, defense, and technology solutions. You will be joining Lockheed Martin Rotary and Mission Systems About Rotary and Mission Systems Our team supports the Strategic Spectrum Solutions portfolio of RMS, and consists of a variety of engineering disciplines that work together to execute design, development, integration and test of systems. We have expertise in Software Defined Radios (SDR), digital signal processing (DSP), GNSS constellation simulation, and signal transceivers. Our team members build strong relationships with one another, founded on trust, open communication, and a...
Lockheed Martin
Jun 19, 2026
Sr Mass Properties Engineer
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. 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. Mass Properties Engineering is the art and science of predicting the mass properties of...
Lockheed Martin
May 29, 2026
Sr Mass Properties Engineer
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. 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. For over 60 years, the Fleet Ballistic Missile (FBM) team has supported the Navy’s mission to provide affordable and credible strategic defense. We offer unique...
Lockheed Martin
May 27, 2026
Senior DFX Manufacturing Engineer
Lockheed Martin King of Prussia, PA
Description: The mission matters. So do the people behind it. With advancing defense technology at our core, what sets us apart is a culture of collaboration, purpose, and impact. 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. What is the mission? For over 60 years, the Fleet Ballistic Missile (FBM) team has supported the Navy’s mission to provide affordable and credible strategic defense. We offer unique career opportunities and challenges on a program with...
Lockheed Martin
May 23, 2026
Systems Engineer
Lockheed Martin King of Prussia, PA
Description: WHAT WE'RE DOING Want to work with cutting-edge technologies in a fun, fast-paced, and dynamic environment? Are you a problem solver that takes on challenges that others think are impossible? If you answered yes to these questions, then we invite you to join Lockheed Martin Rotary and Missions Systems (RMS) as a Systems Engineer! Lockheed Martin is a global leader in aerospace, defense, and technology solutions. You will be joining Lockheed Martin Rotary and Mission Systems supporting the Tactical Tomahawk Weapons Control System (TTWCS) program in Valley Forge, PA. THE WORK We are in search of an experienced Systems Engineer to join our team. As an Engineering Professional on the TTWCS program, you will perform system engineering efforts leading change packages to the existing software system, performing requirements development, interface design, system architecture, and aid in the design and development of future systems. The work location will be in...
Lockheed Martin
May 06, 2026
Electromagnetic Environmental Effects (E3) Engineer - Level II
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. 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. As an Electromagnetic Engineering Effects (E3) Engineer, you will support the System...
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