Sr. Software Developer (Real-Time Simulation & Dev Lab) (Engineer Software 3)
HII Mission Technologies· enterprise· Defense· Oct 24, 2026 · 3d ago
Patuxent River, MD, Maryland, United States
In office
Full-time
Senior
$121K–$180K est.
5+ years exp
Job description
Requisition Number: 30539
Required Travel: 0 - 10%
Employment Type: Full Time/Salaried/Exempt
Anticipated Salary Range: $106,647.00 - $150,000.00
Security Clearance: Top Secret
Level of Experience: Mid
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.
Leadership Mindset at HII – Mission Technologies
Leadership at HII is a mindset, not a title. Through our Leadership Capability Framework, we define how every employee grows, leads, and contributes—regardless of role. It sets the standard for how you can develop yourself and what you can expect from leaders across our organization. We look for candidates who want to grow in alignment with these capabilities:
• Know & Grow Your People – Commit to learning and supporting team success.
• Build Relationships – Communicate openly, collaborate well, and build trust.
• Take Ownership – Deliver on commitments and take pride in your work.
• Customer First – Focus on the mission and those we serve.
• Shape the Future – Bring ideas, curiosity, and continuous improvement.
• Act with Urgency – Take initiative and follow through with purpose.
These capabilities guide how all employees contribute to our shared success across Mission Technologies.
Job Description
HII is seeking a skilled and motivated Sr. Software Engineer to design, develop, and maintain critical simulation translation software components to integrate with US Department of War (DoW) Joint Simulation Environment (JSE) Global Reusable Interface Domain (GRID) based simulation systems. This role is executed primarily in HII and partner facilities in the Patuxent River, MD, area. The candidate will leverage their expertise in C++ and Java, along with strong design skills, to enhance the functionality of HII Simulation Performance Data Engine (SPDE) translators to support JSE integration with other simulation protocols, such as Distributed Interactive Simulation (DIS) and High-Level Architecture (HLA). This role requires a solid understanding of software architecture and development best practices and the ability to work independently on-site while working as part of a remote software development team.
Essential Job Responsibilities
Developing software for an advanced synthetic training environment. This software will integrate with JSE GRID-based flight simulators and related components to support pilot training against potential threats. Support software development, software integration, customer training and demonstrations.
• Design, develop, document, test, and debug C++ and Java simulation protocol translation software in Linux.
• Use distributed modeling and simulation protocol specifications (DIS, GRID, HLA) to derive requirements, create software designs, and perform verification/validation.
• Integrate, troubleshoot, and maintain translation software to facilitate interoperability with GRID-based systems in a JSE simulation laboratory environment.
• Support software architecture development and documentation.
• Work independently on-site while collaborating with a remote team, determining and developing effective solutions with minimal supervision.
• Create technical documentation, including design specifications, installation procedures, and end-user guides.
• Evaluate and review C++ and Java 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 SPDE translators into the JSE environment.
• Participate in software testing, debugging, documentation, and customer demonstrations.
• Support training, troubleshooting, and operational use of translation software and JSE components alongside government personnel.
Minimum Qualifications
• 5 years relevant experience with Bachelors in related field; 3 years relevant experience with Masters in related field; 0 years relevant experience with PhD or Juris Doctorate in related field; or High School Diploma or equivalent and 9 years relevant experience.
• Experience with object-oriented software design and development of multi-threaded applications, particularly in C++ and Java.
• Experience with software development in a Linux environment (Oracle Linux, Red Hat Enterprise Linux).
• Proficiency working in a Linux command-line environment (Bash).
• Experience working with Git version control system, including branching, merging, and conflict resolution.
• Knowledge of best practices for the full software development lifecycle, including coding standards, code reviews, source control, build processes, testing, and operations.
• Able to successfully manage competing tasks and priorities.
• Strong oral and written communication, troubleshooting, and organizational skills, with the ability to work in a remote distributed team environment.
• Current or active (or interim) Secret clearance, with ability to obtain and maintain a DoW Top Secret clearance.
• Must be a US citizen.
Preferred Requirements
• Active Top Secret/SCI clearance.
• Experience developing software for DoW distributed simulations.
• Experience with NGTS, GRID, DIADS, ART, WSCE, FIAB, VATS, or related simulation frameworks.
• Experience with scripting in shell and/or Python.
• Experience working with C++-focused IDEs such as VSCode or Clion, and Java-focused IDEs such as IntelliJ or Eclipse.
• Experience contributing to the system design or architecture of new and current systems.
• Experience with Agile software practices.
• Experience supporting Special Access Program (SAP) efforts.
Physical Requirements
Adequate visual acuity and manual dexterity for meeting the requirements Software Engineer family.
The listed salary range for this role is intended as a good faith estimate based on the role's location, expectations, and responsibilities. When extending an offer, HII's Mission Technologies division takes a variety of factors into consideration which include, but are not limited to, the role's function and a candidate's education or training, work experience, and key skills.
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: vimeo.com
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 buildyourcareer@hii-co.com 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.
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Benefits
Benefits detected in the listing.
Dental
Vision
401(K)
Paid Time Off
Wellness