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30 senior software engineer level 3 jobs found

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Security Clearance senior software engineer level 3
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Lockheed Martin
Mar 17, 2026
Senior Software Engineer
Lockheed Martin Moorestown, NJ, USA
Description: What We're Doing Lockheed Martin is shaping the future of defense through cutting edge radar and missile defense technologies, and we want you to help write the next chapter. As the premier developer of active electronically scanned array (AESA) radars and integrated air and missile defense solutions for the U.S. military, our allies, and more than 45 nations worldwide, we deliver world class situational awareness, early warning, and kill assessment capabilities in the most demanding environments. Join a global team of 35 000 engineers, software developers, and cyber experts who turn complex challenges into reliable, next generation systems that keep warfighters ahead of emerging threats. Your talent will power everything from space domain awareness to ground based radar testbeds, ensuring the safety of today’s forces and the security of tomorrow’s world. The Work The Lockheed Martin Rotary & Mission Systems Senior Software Engineer will have the...
Lockheed Martin
Mar 11, 2026
Aircraft Field Support Engineer- F-35 Program (Lvl 2)
Lockheed Martin Beaufort, SC, USA
Description: Join the Lockheed Martin Aeronautics Company as an Aircraft Field Service Engineer (FSE) on our Aeronautics Field Sustainment team! This FSE position directly supports the USMC customer at U.S. Marine Corps Air Station Beaufort, South Carolina. What You Will Be Doing • As a Nose to Tail (NTT) FSE, the preferred candidate will be a subject Matter Expert (SME) in Avionics/Mission Systems (MS). • It is desired the individual also be an emerging authority in APG/Vehicle Systems (VS) and Supportable Low Observable (SLO)/Structures, with the skill set to accomplish troubleshooting and analysis of MS, VS, or SLO. • The candidate will act as part of the Lockheed Martin Aeronautics Field Sustainment Team's technical interface to the on-site Customer (both Operations and Maintenance) in resolving issues arising from maintenance and modification activities for all matters dealing with the F-35 aircraft. • Must be a United States citizen. Must possess at minimum an...
SAIC
Mar 11, 2026
Cybersecurity Engineer SME
SAIC DC
Description SAIC is seeking a Cybersecurity Engineer SME to join the Machine-assisted Analytic Rapid-repository System (MARS) Advanced Development Operations (DevOps) and Sustainment Support (ADOS) program and provide on-site technical and administrative support to facilitate operations of critical MARS infrastructure and services. This effort focuses on providing a comprehensive set of System/ Software Engineering and IT Services to maintain, sustain, enhance, and improve/ modernize MARS. This position will be located in the National Capital Region. Please note that this is contingent upon contract award, with an anticipated decision expected by Winter/ Spring 2026. The Cybersecurity Engineer SME responsibilities include, but are not limited to: Spearhead the design, implementation, and enhancement of robust cybersecurity measures tailored to the unique requirements Architect and deploy advanced security solutions that safeguard the MARS...
SAIC
Mar 11, 2026
Cybersecurity Engineer SME
SAIC VA
Description SAIC is seeking a Cybersecurity Engineer SME to join the Machine-assisted Analytic Rapid-repository System (MARS) Advanced Development Operations (DevOps) and Sustainment Support (ADOS) program and provide on-site technical and administrative support to facilitate operations of critical MARS infrastructure and services. This effort focuses on providing a comprehensive set of System/ Software Engineering and IT Services to maintain, sustain, enhance, and improve/ modernize MARS. This position will be located in the National Capital Region. Please note that this is contingent upon contract award, with an anticipated decision expected by Winter/ Spring 2026. The Cybersecurity Engineer SME responsibilities include, but are not limited to: Spearhead the design, implementation, and enhancement of robust cybersecurity measures tailored to the unique requirements Architect and deploy advanced security solutions that safeguard the MARS...
Lockheed Martin
Mar 10, 2026
JASSM UI Software Engineer, Senior / C++ - Orlando, FL
Lockheed Martin Orlando, FL, USA
Description: You will be a Sr. Software Engineer on our team at Lockheed Martin. Lockheed Martin is a global security and aerospace company that employs approximately 114,000 people worldwide and is principally engaged in the research, design, development, manufacture, integration and sustainment of advanced technology systems, products and services. Lockheed Martin Missiles and Fire Control (MFC) is one of four Lockheed Martin business areas. MFC is a recognized designer, developer and manufacturer of precision engagement aerospace and defense systems for the U.S. and allied militaries. MFC develops, manufactures and supports advanced products for military customers that include the U.S. Army, Navy, Air Force, Marine Corps, NASA and dozens of foreign allies. MFC also offers a wide range of products and services for the global civil nuclear power industry and the military’s green power initiatives. What You Will Be Doing As a Sr. Software Engineer, your responsibilities...
Lockheed Martin
Feb 25, 2026
Senior Systems Engineer
Lockheed Martin King of Prussia, PA, USA
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
Feb 18, 2026
Sr Mass Properties Engineer
Lockheed Martin King of Prussia, PA, USA
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...
General Dynamics Mission Systems, Inc
Feb 12, 2026
Structural Mechanical Engineer
General Dynamics Mission Systems, Inc Herndon, VA, USA
Basic Qualifications Requires a Bachelor’s degree in Mechanical Engineering, or a related Science, Engineering, Technology or Mathematics field. Also requires 5+ years of job-related experience, or a Master's degree plus 3 years of job-related experience.     CLEARANCE REQUIREMENTS: Department of Defense Secret security clearance is required at time of hire. Applicants selected will be subject to a U.S. Government security investigation and must meet eligibility requirements for access to classified information. Due to the nature of work performed within our facilities, U.S. citizenship is required. Responsibilities for this Position ROLE AND POSITION OBJECTIVES: As a Senior Structural-Mechanical Engineer for Intelligence Systems, you will be responsible for performing structural analysis using applicable material resources, methods, and standards; perform design and development of mechanical systems; and carry out...
General Dynamics Mission Systems, Inc
Feb 12, 2026
Senior Systems Engineer
General Dynamics Mission Systems, Inc Taunton, MA, USA
Basic Qualifications Requires a Bachelor’s degree in Systems Engineering, or a related Science, Engineering, Technology or Mathematics field. Also requires 8+ years of job-related experience, or a Master's degree plus 6 years of job-related experience. Agile experience preferred.   CLEARANCE REQUIREMENTS: Department of Defense Secret security clearance is required at time of hire. Applicants selected will be subject to a U.S. Government security investigation and must meet eligibility requirements for access to classified information. Due to the nature of work performed within our facilities, U.S. citizenship is required. Responsibilities for this Position ROLE AND POSITION OBJECTIVES:   As a Systems Engineer, working with custom software built in-house, for our Cyber group, you’ll be amember of a cross functional team responsible for developing mission critical NSA-certifiedCybersecurity devices in a rapidly...
Lockheed Martin
Feb 07, 2026
DevSecOps Engineer, Senior - Active TS/SCI Clearance to Start
Lockheed Martin King of Prussia, PA, USA
Description: The coolest jobs on this planet… or any other… are with Lockheed Martin Space. At the dawn of a new space age, Lockheed Martin is a pioneer, partner, innovator and builder. Our amazing people are on a mission to make a difference in the world and every day we use our unique skills and experiences to create, design and build solutions to some of the worlds’ hardest engineering problems. Our culture encourages employees to dream big, perform with excellence and create incredible products. We provide the resources, inspiration and focus and if you have the passion and courage to dream big, we want to build a better tomorrow with you. The Space Security Division within Lockheed Martin Space’s Mission Solutions business area is seeking a talented and dedicated Systems Engineer-IT to become a member of an Agile team focused on IT Infrastructure (Systems Administration, Networking, & Hardware) in the Foxtrot Program Area. Are you a Senior DevSecOps Engineer for...
Lockheed Martin
Feb 05, 2026
Cybersecurity Anti-Tamper Senior Engineer
Lockheed Martin Moorestown, NJ, USA
Description: WHAT WE’RE DOING At Lockheed Martin Rotary and Mission Systems, we're on a mission to drive innovation and uphold the highest standards of business ethics. We believe that by pushing the boundaries of visionary thinking, we can achieve exceptional results. As a Lockheed Martin employee, you'll have the opportunity to make a meaningful impact while working in an environment that values integrity and excellence. THE WORK The Cyber Systems Security Engineering team in Moorestown, NJ is seeking a senior Electrical or Computer Engineer to design, develop, and sustain hardware based anti tamper solutions that safeguard critical military technology. You will work closely with cross functional engineers, program managers, and customers to ensure security requirements are met and to evaluate emerging threat vectors. In this role you will: • Develop and implement hardware anti tamper architectures that protect mission critical systems. • Verify system design requirements and...
Lockheed Martin
Jan 27, 2026
F-35 Aircraft Field Support Engineer Staff (Kleine-Brogel, Belgium)
Lockheed Martin Greenville, SC, USA
Description: Join the Lockheed Martin Aeronautics Company as an Aircraft Field Service Engineer (FSE) on our Aeronautics Field Sustainment team! This position will support the Belgium Air Component at Kleine-Brogel, Belgium Air Base. As a Nose to Tail (NTT) FSE, the preferred candidate will be a subject Matter Expert(SME) in APG/Vehicle Systems (VS). It is desired the individual also be an emerging authority in Avionics/Mission Systems (MS) and Supportable Low Observable (SLO)/Structures, with the skill set to accomplish troubleshooting and analysis of VS, MS, or SLO. The candidate will act as part of the Lockheed Martin Aeronautics Field Sustainment Team's technical interface to the on-site Customer (both Operations and Maintenance) in resolving issues arising from maintenance and modification activities for all matters dealing with the F-35 aircraft. What You Will Be Doing Responsibilities include: •Accomplish troubleshooting and analysis of difficulties experienced in...
Lockheed Martin
Jan 27, 2026
F-35 Aircraft Field Support Engineer Staff, (Kleine-Brogel, Belgium)
Lockheed Martin Greenville, SC, USA
Description: Join the Lockheed Martin Aeronautics Company as an Aircraft Field Service Engineer (FSE) on our Aeronautics Field Sustainment team! This position will support the Belgium Air Component at Kleine-Brogel, Belgium. As a Nose to Tail (NTT) FSE, the preferred candidate will be a subject Matter Expert(SME) in Avionics/Mission Systems (MS). It is desired the individual also be an emerging authority in APG/Vehicle Systems (VS) and Supportable Low Observable (SLO)/Structures, with the skill set to accomplish troubleshooting and analysis of VS, MS, or SLO. The candidate will act as part of the Lockheed Martin Aeronautics Field Sustainment Team's technical interface to the on-site Customer (both Operations and Maintenance) in resolving issues arising from maintenance and modification activities for all matters dealing with the F-35 aircraft. What You Will Be Doing Responsibilities include: •Accomplish troubleshooting and analysis of difficulties experienced in the field....
Lockheed Martin
Jan 23, 2026
EOTS Software Engineer - Senior / Embedded / C++ - Orlando, FL
Lockheed Martin Orlando, FL, USA
Description: You will be a Senior Software Engineer on our EOTS team at Lockheed Martin. The Electro-Optical Targeting System (EOTS) is the world’s first sensor that combines forward-looking infrared (FLIR) and infrared search and track (IRST) functionality. Lockheed Martin is a global security and aerospace company that employs approximately 114,000 people worldwide and is principally engaged in the research, design, development, manufacture, integration and sustainment of advanced technology systems, products and services. Lockheed Martin Missiles and Fire Control (MFC) is one of four Lockheed Martin business areas. MFC is a recognized designer, developer and manufacturer of precision engagement aerospace and defense systems for the U.S. and allied militaries. MFC develops, manufactures and supports advanced products for military customers that include the U.S. Army, Navy, Air Force, Marine Corps, NASA and dozens of foreign allies. MFC also offers a wide range of products and...
Lockheed Martin
Jan 21, 2026
F-35 Aircraft Field Support Engineer Staff (Barnes ANGB, MA)
Lockheed Martin Westfield, MA, USA
Description: Join the Lockheed Martin Aeronautics Company as an Aircraft Field Service Engineer (FSE) on our Aeronautics Field Sustainment team! This position will support the Barnes Air National Guard Base(ANGB), Westfield, Massachusetts. As a Nose to Tail (NTT) FSE, the preferred candidate will be a subject Matter Expert(SME) in Supportable Low Observable (SLO)/Structures. It is desired the individual also be an emerging authority in APG/Vehicle Systems (VS) and Avionics/Mission Systems (MS), with the skill set to accomplish troubleshooting and analysis of VS, MS, or SLO. The candidate will act as part of the Lockheed Martin Aeronautics Field Sustainment Team's technical interface to the on-site Customer (both Operations and Maintenance) in resolving issues arising from maintenance and modification activities for all matters dealing with the F-35 aircraft. What You Will Be Doing Responsibilities include: •Accomplish troubleshooting and analysis of difficulties...
Lockheed Martin
Jan 21, 2026
F-35 Aircraft Field Support Engineer Senior (Barnes ANGB, MA)
Lockheed Martin Westfield, MA, USA
Description: Join the Lockheed Martin Aeronautics Company as an Aircraft Field Service Engineer (FSE) on our Aeronautics Field Sustainment team! This position will support the Barnes Air National Guard Base (ANGB), Westfield, Massachusetts. As a Nose to Tail (NTT) FSE, the preferred candidate will be a subject Matter Expert(SME) in APG/Vehicle Systems (VS). It is desired the individual also be an emerging authority in Supportable Low Observable (SLO)/Structures and Avionics/Mission Systems (MS), with the skill set to accomplish troubleshooting and analysis of VS, MS, or SLO. The candidate will act as part of the Lockheed Martin Aeronautics Field Sustainment Team's technical interface to the on-site Customer (both Operations and maintenance) in resolving issues arising from maintenance and modification activities for all matters dealing with the F-35 aircraft. What You Will Be Doing Responsibilities include: •Accomplish troubleshooting and analysis of difficulties...
SAIC
Mar 11, 2026
Senior Cybersecurity Chief
SAIC OK
Description SAIC is currently seeking a Senior/Chief Cybersecurity professional to support the 559th Software Engineering Squadron in their efforts to obtain and maintain Authorities to Operate (ATOs) for critical Air Force weapon systems essential to National Defense. This position is based out of Oklahoma City, OK. This is potentially a short-term position that may terminate in March/April of 2026. Target salary is $150-175k. In this role, the cybersecurity professional will: Provide technical advice to the Information System Security Engineers (ISSEs), Information System Security Officers (ISSOs), and Program Managers. Utilize their expertise and knowledge to implement the System Security Plan, generate Security Assessment Reports,and conduct the necessary vulnerability scans required for obtaining and maintaining ATOs from the Authorizing Official (AO). Support Risk Management Framework (RMF) activities and other cybersecurity tasks/requirements...
SAIC
Mar 11, 2026
Defense Systems Engineer
SAIC IN
Description SAIC is seeking a Defense Systems Engineer for our Crane, IN location. This is a technically challenging position requiring working with complex military systems, systems integration, network engineering, and cyber security. The successful candidate will support the customer by developing, defining and testing system requirements and analyzing computational technologies to recommend optimal hardware and software solutions for military use. Ultimately, they will translate customer needs into comprehensive technical solutions by leading various systems engineering activities. Additionally, the candidate will possess the skills listed: Abilities and Experience: Ability to integrate an Electronic Warfare (EW) system into shipboard Command and Control (C2) systems. Interface with and utilize the Consolidated Afloat Networks and Enterprise (CANES) with experience in each CANES variant. Knowledge of Cooperative Engagement Capability (CEC)...
Lockheed Martin
Mar 06, 2026
Senior Software Engineer - Secret Clearance
Lockheed Martin Colorado Springs, CO, USA
Description: What We’re Doing Our team, Command and Control, Battle Management and Communications (C2BMC)- Global team at Lockheed Martin, is dedicated to engineering, developing, and integrating new capabilities for the Missile Defense System that protects the United States and its allies. While we are part of a large organization, we operate within smaller, agile teams in a fast-paced, dynamic environment. Our responsibilities include Sensor/Weapon Integration, Algorithm Development, User Interface Development, Automated Testing, Cyber Security, and enhancing critical missile defense technologies. The Work The successful candidate will be responsible for performing in-depth analysis and technical support of systems software products, including complex problem resolution, design, development, testing, operational integration, and user support. They will maintain currency, debugs and configures related software products. Works from specifications to develop or modify...
Lockheed Martin
Mar 04, 2026
DevSecOps Software Engineer - Secret Clearance
Lockheed Martin Huntsville, AL, USA
Description: What We’re Doing We're working on the cutting edge of defense technology, developing advanced solutions to address some of the most complex and mission-critical challenges in national security. Our focus is on enabling faster, smarter decision-making through innovation in tracking, sensor integration, and battle management systems. The Work Lockheed Martin Rotary and Mission Systems (RMS) is seeking a DevSecOps (DSO) Associate Engineer to design, develop, and operate a secure, fully‑automated infrastructure pipeline. This role will support Infrastructure-as-Code (IaC) development. This role will also support DoD STIG compliance, configuration‑management baselines, and continual technology refreshes—while adhering to the highest cybersecurity standards required for mission‑critical systems. The selected candidate will work with Software and System Engineers supporting the C2BMC program for the Missile Defense Agency. Who We Are As leader of the C2BMC team,...
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