Senior Specialist, Systems Engineering – Modeling and Simulation

L3Harris Technologies

L3Harris space systems engineer modeling simulations for USSPACECOM training and mission planning. Developing architectures, wargames, and operational analysis for live, virtual, and constructive exercises.

Posted 8/11/2026full-timeColorado Springs • Colorado • 🇺🇸 United StatesSenior💰 $92,500 - $171,500 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in modeling and simulation for space operations, with a strong foundation in Systems Tool Kit (STK) and advanced knowledge of orbital mechanics and Space Domain Awareness. Capable of developing tactics, techniques, and procedures while supporting government exercises and presenting findings to senior leadership.

Highest-signal resume keywords

Active Top Secret ClearanceStrong Knowledge of Space OperationsAdvanced Knowledge of Systems Tool Kit (STK)Experience with Wargame Model DevelopmentBroad Knowledge of DoD and National Assets

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Modeling and SimulationOrbital MechanicsTactics, Techniques, and Procedures DevelopmentOperational Maneuvers AnalysisHypothetical Analysis Integration

Soft Skills

CommunicationCollaborationPresentation Skills

Tools & Technologies

Systems Tool Kit (STK)Model Based Systems Engineering (MBSE)Systems Modeling Language (SysML)Space Domain Command and Control System (SDCCS)Iron Stallion (IS)

Certifications & Qualifications

Active Top Secret ClearanceCounterintelligence Polygraph Eligibility

Industry Keywords

Space Domain AwarenessNational Space Defense CenterDoDAdversary Space SystemsCommon Operating Picture Tools

About the role

Key responsibilities & impact

Support a high-performing Government and Contractor team in developing a concept of operations and notional system architecture for future live, virtual, and constructive training, exercises, and experiments
Use Systems Tool Kit (STK) and other simulation tools to support space operations, current and future operations, and training at the National Space Defense Center
Develop modeling and simulation products for live, virtual, and constructive training and NSDC Advanced Concept Experimentation
Model real-world engagements, training events, and mission planning operations
Support development of tactics, techniques, and procedures
Provide a foundation for future requirements development of common operating picture tools
Participate in exercises and government-driven events to derive performance benchmarks and technical utility
Generate, share, and present briefings and products for senior leadership and enterprise awareness
Perform additional assigned duties and responsibilities

Requirements

What you’ll need

Bachelor’s Degree and minimum 6 years of prior relevant experience
Alternatively, graduate degree and minimum 4 years of prior related experience
Alternatively, minimum 10 years of prior related experience in lieu of a degree
Active Top Secret clearance with Sensitive Compartmented Information eligibility
Ability to obtain a Counterintelligence Polygraph
Strong knowledge of space operations, orbital mechanics, and Space Domain Awareness
Advanced knowledge of Systems Tool Kit (STK), Model Based Systems Engineering software (MBSE), and Systems Modeling software (SysML)
Knowledge of Space Domain Command and Control System (SDCCS) or Iron Stallion (IS) beneficial
Experience with wargame model development and integrating real-world data into hypothetical analysis
Experience developing courses of action for operational maneuvers and applying analysis of alternatives in operations planning and what-if drills
Broad knowledge of DoD, national assets, and adversary space systems

Benefits

Comp & perks

Health and disability insurance
401(k) match
Flexible spending accounts
EAP
Education assistance
Parental leave
Paid time off
Company-paid holidays