Space Systems Integration (SSI) is a fast-growing engineering company that provides aerospace solutions to a variety of government and commercial customers. Our employees are forward-thinking, self-directed individuals who are committed to solving our customers’ technical challenges. SSI is seeking an ISR Principal Modeling/Simulation Engineer for a role in Chantilly, VA. The qualified applicant will provide local support to the Space Warfighting Analysis Center (SWAC), Multi-Domain Sensing Program (MDSP), Space-based Intelligence Surveillance Reconnaissance and Targeting (ISRT) Division with expertise in ISR systems/processes and modeling and simulation (M&S). Efforts include (but not limited to): Developing space-based ISR models, executing space-based ISR models, analyzing and assessing modeling and simulation results from analysis partners across all classification levels. This position requires significant technical understanding of space-based ISR as well as significant experience with M&S. Experience and understanding of airborne ISR capabilities is also desired. The candidate must be able to: articulate what remote sensing is needed from tactical to strategic levels, where it needs to go and how fast it needs to get there; employ and develop modeling, simulation, and analysis tools; analyze modeling and simulation results; coordinate internal and external modeling and simulation efforts and provide recommendations on potential improvements to concepts and architectures. Role and Responsibilities include: Develop target (missile) simulations and corresponding trajectory and behavior files using industry standard M&S tools such as the Advanced Framework for Simulation Integration and Modeling (AFSIM). ** Primary Develop modeling and simulation analysis and assessment scripts using government network supportable tools such as Visual Basic, Python, and/or Matlab. **Primary Develop space-based missile warning access and performance models using industry standard M&S tools such as Systems Tool Kit (STK) or Satellite Orbit Analysis Program (SOAP) and integrate SWAC space-based ISR capability area force designs with modeling and simulation expertise. **Secondary Support Assist in force design analysis planning, analysis execution coordination, and analysis results evaluation. Recommend and document force design dependencies and opportunities (joint, intelligence community, industry, international and other government organizations). Assist with modeling inputs and simulation development for external M&S efforts. Collaborate in cross-functional planning, coordination, and task execution involving the full spectrum of systems engineering and integration activities for a force design effort. Coordinate efforts internally and externally with multiple agencies/organizations.