Sr. Software Developer (Real-Time Simulation & Dev Lab) - 27748 with Security Clearance

Requisition Number: 27748 Required Travel: 0 - 10% Employment Type: Full Time/Salaried/Exempt Anticipated Salary Range: $128,989.00 - $185,000.00 Security Clearance: Top Secret Level of Experience: Senior This opportunity resides with Global Security (GS). Mission Technologies' Global Security (GS) group comprises live, virtual, constructive (LVC) solutions; fleet sustainment; nuclear and environmental; and Australia business. As a trusted partner to our military customers, HII designs, develops and operates the largest LVC enterprise that prepares warfighters for cross-domain battle.

With advanced technologies to enable mission readiness, HII understands that preparation requires full coordination-not readiness in piece-parts. For more than 40 years, the U.S. Navy has entrusted HII to maintain and modernize the vast majority of its fleet. With a holistic approach to life-cycle maritime defense systems-from small watercraft to submarines, surface combatants and aircraft carriers-HII ensures a high state of readiness.

HII supports the Department of Energy's national security mission through the management and operation of its sites, as well as the safe cleanup of legacy waste across the country. HII meets clients' toughest nuclear and environmental challenges. Meet HII's Mission Technologies Division
Our team of more than 7,000 professionals worldwide delivers all-domain expertise and advanced technologies in service of mission partners across the globe.

Mission Technologies is leading the next evolution of national defense - the data evolution - by accelerating a breadth of national security solutions for government and commercial customers. Our capabilities range from C5ISR, AI and Big Data, cyber operations and synthetic training environments to fleet sustainment, environmental remediation and the largest family of unmanned underwater vehicles in every class. Find the role that's right for you. Apply today. We look forward to meeting you.

To learn more about Mission Technologies, click here for a short video: https://vimeo.com/732533072 Summary HII Mission Technologies is seeking a Senior Software Engineer to support development and integration of advanced modeling and simulation capabilities within the Joint Simulation Environment (JSE) at NAS Patuxent River, MD. JSE is a high-fidelity, continuously evolving synthetic battlespace used for training, test, threat replication, analysis, and R&D across the Navy and joint forces.

As part of an on-site team supporting NAWCAD, you will design, enhance, and maintain critical software components used across the JSE ecosystem-including NGTS, DIADS, GRID, and other constructive and virtual simulation frameworks. This role is ideal for an experienced C++ engineer who enjoys solving complex technical problems, contributing to large-scale simulation systems, and working closely with operators, engineers, and mission stakeholders.

Impact Your work directly strengthens the Navy's ability to train, test, and evaluate next-generation capabilities in realistic multi-domain environments. Your engineering contributions will improve simulation accuracy, system performance, interoperability, and threat representation used by aviators, analysts, and test organizations. You will play a key role in advancing JSE as a mission-critical training and test environment for the Department of Defense.

Key Responsibilities

• Design, develop, integrate, and maintain software modules for the JSE synthetic environment and related systems.
• Implement C++/C software features supporting constructive entities, threat systems, visualization components, and environmental behaviors.
• Evaluate and review C++ code, ensuring high-quality, scalable, and maintainable designs.
• Develop multi-threaded or parallel-processing components and inter-process communication solutions.
• Use Git for daily development, including branching, merging, pull requests, and resolving conflicts.
• Work in Linux (Bash) and Windows environments; interact with remote repositories and CI/CD infrastructure.
• Collaborate with other engineers and system architects to design new capabilities and support integration of NGTS, DIADS, GRID, and related toolsets.
• Participate in software testing, debugging, documentation, and customer demonstrations.
• Support training, troubleshooting, and operational use of JSE components alongside government personnel. What you must have
• 9 years relevant experience with Bachelors in related field; 7 years relevant experience with Masters in related field; 4 years relevant experience with PhD or Juris Doctorate in related field; or High School Diploma or equivalent and 13 years relevant experience.
• Strong experience in object-oriented software development, primarily in C++.
• Hands-on experience using Git (branching, merging, conflict resolution).
• Proficiency in Linux command-line environments (Bash).
• Ability to manage multiple tasks and priorities in a collaborative team setting.
• Strong communication, troubleshooting, and organizational skills.
• Current or active (or interim) Secret clearance, with ability to obtain and maintain a DoD Top Secret clearance.
• U.S. Citizenship is required.

Preferred Qualifications

• Active Top Secret/SCI clearance.
• Experience with NGTS, GRID, DIADS, ART, WSCE, FIAB, VATS, or related simulation frameworks.
• Experience with object-oriented programming in Java or Python.
• Experience contributing to system architecture, design reviews, or integration planning.
• Background in Agile development practices.
• Advanced Git usage, including release management, branching strategies, and multi-repo workflows.
• Familiarity with Red Hat Enterprise Linux (RHEL).
• Experience supporting Special Access Program (SAP) environments. Physical Requirements Adequate visual acuity and manual dexterity for meeting the requirements Software Engineer family. HII is more than a job - it's an opportunity to build a new future. We offer competitive benefits such as best-in-class medical, dental and vision plan choices; wellness resources; employee assistance programs; Savings Plan Options (401(k)); financial planning tools, life insurance; employee discounts; paid holidays and paid time off; tuition reimbursement; as well as early childhood and post-secondary education scholarships. Bonus/other non-recurrent compensation is occasionally offered for qualified positions, and if applicable to this role will be addressed by the recruiter at the screening phase of application. Why HII

We build the world's most powerful, survivable naval ships and defense technology solutions that safeguard our seas, sky, land, space and cyber. Our workforce includes skilled tradespeople; artificial intelligence, machine learning (AI/ML) experts; engineers; technologists; scientists; logistics experts; and business administration professionals. Recognized as one of America's top large company employers, we are a values and ethics driven organization that puts people's safety and well-being first. Regardless of your role or where you serve, at HII, you'll find a supportive and welcoming environment, competitive benefits, and valuable educational and training programs for continual career growth at every stage of your career. Together we are working to ensure a future where everyone can be free and thrive.
All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, physical or mental disability, age, or veteran status or any other basis protected by federal, state, or local law. Do You Need Assistance? If you need a reasonable accommodation for any part of the employment process, please send an e-mail to and let us know the nature of your request and your contact information. Reasonable accommodations are considered on a case-by-case basis. Please note that only those inquiries concerning a request for reasonable accommodation will be responded to from this email address. Additionally, you may also call 1-844-849-8463 for assistance. Press #3 for HII Mission Technologies.