Guidance, Navigation, and Control Engineer

MTSI is seeking to a motivated engineer with experience in Guidance, Navigation, and Control (GNC) systems and modeling & simulation. The candidate will support a team delivering modeling, simulation, and analytical products of kinetic weapon system concepts for the Missile Defense Agency. This role offers the opportunity to work on exciting, high-visibility missile system programs and contribute to innovative solutions for national defense.

• Conduct performance analysis and provide support for the design, integration, and testing of GNC systems for offensive and defensive missile programs.
• Perform modeling and simulation tasks using 6-DOF simulations to evaluate system behavior, dynamics, and performance under various conditions.
• Develop, modify, and run 6-DOF models to support analysis of guidance, navigation, and control performance.
• Collaborate with senior engineers and cross-functional teams to prototype, test, and refine weapon system concepts using legacy 6-DOF simulations in FORTRAN and C++.
• Develop analytical products, technical reports, and presentations for emerging missile and weapon system concepts supporting DoD programs.
• Contribute to ongoing missile programs by assisting with requirements analysis, scenario development, and corporate modeling tool improvement.
• Help maintain and enhance simulation fidelity, including integration of models from different sources and programming languages.

• US citizenship and an active secret clearance is required
• Bachelor's degree in Aerospace Engineering, Mechanical Engineering, Electrical Engineering, Physics, or a related technical field (MS preferred).
• 3-5 years of hands-on experience in missile systems, aerospace engineering, or related modeling & simulation work.
• Familiarity with 6-DOF simulation models, including topics such as aerodynamics, guidance algorithms, navigation systems, and basic filtering techniques (e.g., Kalman filters).
• Some exposure to modeling and simulation tools, including FORTRAN, C++, MATLAB, and Python.
• Demonstrated ability to conduct system-level and subsystem-level analysis to support requirements development and performance assessment.
• Strong problem-solving, data analysis, and technical communication skills.

Our co-workers support some of the most important and critical programs to our national defense and security.

Our first core value is that employees come first. We challenge our co-workers to provide the highest level of support and service, and reward them with some of the best benefits in the industry.

We have a stake in each other's success, and the success of our customers. It's also nice to know what's going on across the company; we have company wide town-hall meetings three times a year.

• Starting PTO accrual of 20 days PTO/year + 10 holidays/year
• Flexible schedules
• 6% 401k match with immediate vesting up to $9k annually
• Semi-annual bonus eligibility (July and December)
• Company funded Employee Stock Ownership Plan (ESOP) - a separate qualified retirement account
• Up to $10,000 in annual educational reimbursement
• Other company funded benefits, like life and disability insurance
• Optional zero deductible Blue Cross/Blue Shield health insurance plan

We have grown every year since our founding in 1993.

Modern Technology Solutions, Inc. (MTSI) is a 100% employee-owned engineering services and solutions company that provides high-demand technical expertise in Digital Transformation, Modeling and Simulation, Rapid Capability Development, Test and Evaluation, Artificial Intelligence, Autonomy, Cybersecurity and Mission Assurance

MTSI delivers capabilities to solve problems of global importance. Founded in 1993, MTSI today has employees at over 20 offices and field sites worldwide.

For more information about MTSI, please visit

MTSI embraces nine core values including our first core value of Employees come first. Consistent with our Core Values, we are committed to Equal Opportunity, making decisions without regard to race, color, religion, sex, national origin, age, military/veteran status, disability, or any other characteristics protected by applicable law. MTSI is committed to Equal Employment Opportunity and providing reasonable accommodations to applicants and employees with physical and/or mental disabilities.