Principal Modeling & Simulation Software Engineer

Trinzic; Reston (VA); On-site; USD 170,000 - 195,000; Full time

Job summary

KBR's Mission Technology Solutions seeks a Principal Modeling & Simulation Software Engineer to design, develop, and maintain modeling primitives and reusable components using AFSIM scripting, C#, Razor, and related tools. You will integrate primitives into simulations and verify them.

The role requires 10+ years in CS/SE, experience with AFSIM or similar, TS/SCI eligibility, and the ability to work in a small high-performance team supporting mission-grade systems.

Qualifications

• 10+ years of relevant experience in modeling, simulation, and analysis (MS&A).
• Proficient in object-oriented software development using C#, C++, Python.
• Experience with mission-level combat simulation frameworks such as AFSIM, NGTS, ITASE, SAFE-SiM, or similar.
• Experience developing/modifying models, behaviors, or simulation components within AFSIM or similar environments.
• Knowledge of software engineering best practices: version control, testing, documentation, and configuration management.
• Active Top-Secret clearance with SCI eligibility.
• Ability to work effectively in a small, high-performance team.
• Strong collaboration in multidisciplinary, expert-driven teams.

Responsibilities

• Design, develop, and maintain modeling primitives, behaviors, and reusable software components using AFSIM scripting languages, C#, Razor, and related technologies.
• Implement new model capabilities and enhancements for operational systems, platforms, sensors, weapons, and C2 functions.
• Develop model compositions by integrating primitives into reusable simulation constructs.
• Create and execute verification and validation test plans for model functionality and fidelity.
• Identify, troubleshoot, and resolve software defects and performance issues through testing and debugging.
• Prepare technical documentation detailing model design, implementation, assumptions, limitations, and test results.
• Collaborate with software engineers, integration teams, analysts, and subject matter experts to meet mission requirements.
• Support integration, regression testing, and configuration management for deployment in enterprise environments.
• Provide technical guidance and peer reviews to promote quality and standards.

Skills

C#

C++

Python

OO design

Education

Bachelor of Science in Computer Science, Software Engineering, or other STEM field

Master of Science in Computer Science, Software Engineering, or other STEM field

Job description

Principal Modeling & Simulation Software Engineer

At KBR, we deliver science, technology and engineering solutions to governments and companies around the world. KBR employs approximately 37,000 people worldwide with customers in more than 85 countries and operations in over 28 countries. KBR is proud to work with its customers across the globe to provide technology, value-added services, and long-term operations and maintenance services to ensure consistent delivery with predictable results.

Trinzic is the future independent company to be created through the planned spin-off of KBR's Mission Technology Solutions business, expected in January 2027. Our people work at the frontier of what is possible, delivering solutions in challenging environments and advancing some of the world's highest-priority national security and space missions.

Backed by decades of mission success, deep expertise, and trusted partnerships, Trinzic will launch as a global organization with more than 18,000 employees supporting customers around the world. Join us at a defining moment and help shape the future of a company built to tackle complex challenges and make a meaningful impact.

Candidates who join KBR's Mission Technology Solutions business before the spin-off will transition to Trinzic when the separation is complete and will not need to reapply for employment.

Key Responsibilities:

• Design, develop, and maintain modeling primitives, behaviors, and reusable software components using AFSIM scripting languages, C#, Razor, and other applicable technologies.
• Implement new model capabilities and enhancements that accurately represent operational systems, platforms, sensors, weapons, command-and-control functions, and other mission-relevant entities.
• Develop model compositions and complex behaviors by integrating lower-level primitives into reusable simulation constructs.
• Create and execute verification and validation test plans to ensure model functionality, performance, and fidelity prior to integration into the core simulation framework.
• Identify, troubleshoot, and resolve software defects and model performance issues through structured testing and debugging.
• Prepare technical documentation describing model design, implementation approaches, assumptions, limitations, and test results.
• Collaborate closely with software engineers, integration teams, analysts, and subject matter experts to ensure models meet mission and technical requirements.
• Support integration, regression testing, and configuration management activities associated with deployment into enterprise modeling and simulation environments.
• Provide technical guidance and peer reviews to promote software quality, consistency, and adherence to development standards.

Work Environment:

• Location: On-site
• Travel Requirements: Minimal 0-20%, supporting strong work-life balance
• Working Hours: Standard

  Qualifications:

  Required:

  • Bachelor of Science in Computer Science, Software Engineering, or other STEM field with 10+ years of relevant experience
  • 4+ years of modeling, simulation, and analysis (MS&A) experience with one or more mission-level combat simulation frameworks such as AFSIM, NGTS, ITASE, SAFE-SiM, or similar environments
  • Demonstrated proficiency in object-oriented software development using C#, C++, Python, or comparable programming languages
  • Experience developing, modifying, testing, and debugging models, behaviors, or simulation components within AFSIM or similar modeling and simulation environments
  • Experience applying software engineering best practices including version control, structured testing, documentation, and configuration management
  • Active Top-Secret clearance with Sensitive Compartmented Information (SCI) eligibility
  • Demonstrated ability to work effectively in a small, high-performance team environment
  • Strong collaborative skills with experience working in expert-driven, multidisciplinary teams

  Desired:

  • Master of Science in Computer Science, Software Engineering, or other STEM field with 12+ years of relevant experience
  • Experience developing or modifying Razor-based model components
  • Experience developing reusable software libraries, model primitives, behaviors, or simulation extensions for integration into larger modeling and simulation frameworks
  • Familiarity with MBSE techniques and tools, with the ability to translate operational concepts and behavioral models into executable simulation capabilities
  • Familiarity with automated testing, continuous integration, or software quality assurance processes within modeling and simulation environments
  • Experience with source control, software configuration management, automated build pipelines, and CI/CD tools such as Git, GitLab, Jenkins, DevOps, or similar platforms
  • Experience representing military systems, sensors, weapons, effects, or command-and-control processes in mission-level simulations
  • Scheduled Weekly Hours:40hrs
  • Basic Compensation:The offered rate will be based on the selected candidate’s knowledge, skills, abilities and/or experience and in consideration of internal parity.
  • Compensation range for Virginia is $170,000 to $195,000

  Additional Compensation:

  • KBR may offer bonuses, commissions, or other forms of compensation to certain job titles or levels, per internal policy or contractual designation.
  • Additional compensation may be in the form of sign on bonus, relocation benefits, short-term incentives, long-term incentives, or discretionary payments for exceptional performance.

  KBR Benefits

  KBR offers a selection of competitive lifestyle benefits which could include 401K plan with company match, medical, dental, vision, life insurance, AD&D, flexible spending account, disability, paid time off, or flexible work schedule. We support career advancement through professional training and development.

  Belong, Connect and Grow at KBRAt KBR, we are passionate about our people and our Zero Harm culture. These inform all that we do and are at the heart of our commitment to, and ongoing journey toward being a People First company. That commitment is central to our team of team’s philosophy and fosters an environment where everyone can Belong, Connect and Grow. We Deliver – Together.

  KBR is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, disability, sex, sexual orientation, gender identity or expression, age, national origin, veteran status, genetic information, union status and/or beliefs, or any other characteristic protected by federal, state, or local law.