Senior Modeling and Simulation Systems Engineer with Security Clearance

We are seeking a Senior Modeling and Simulation (M&S) Systems Engineer to directly support the Defense Threat Reduction Agency (DTRA). This is a full-time, on-site position located at DTRA Headquarters at Fort Belvoir, VA. In this role, you will serve as the principal technical authority specializing in the characterization, targeting, and defeat modeling of Underground Facilities (UGFs) and hardened deeply buried targets (HDBTs). You will lead the development, evaluation, and integration of high-fidelity simulations that predict weapons effects, structural collapse, and subsequent agent release within confined subterranean environments to provide data-driven insights to protect the Joint Force.

Key Responsibilities

• Underground Facility (UGF) Modeling : Lead the development and execution of predictive simulations focusing on structural defeat, tunnel collapse, weapon penetration, and internal blast effects within complex UGFs and HDBTs.
• Subterranean CBRN Hazard Modeling : Develop, execute, and optimize complex mathematical simulations utilizing HPAC and VLSTRACK to model agent transport, toxic chemical/biological propagation, and source-term generation from struck underground environments.
• C-WMD Architecture Design : Lead the creation of advanced M&S technical strategies, architectures, and predictive frameworks tailored to adversary capabilities across the WMD and subterranean continuum.
• System-of-Systems Integration : Coordinate Software-in-the-Loop (SIL) and Hardware-in-the-Loop (HIL) environments to integrate physical threat tools with modernized DoD forecasting systems.
• VV&A Oversight : Establish rigorous verification, validation, and accreditation (VV&A) frameworks for HPAC, VLSTRACK, and adjacent geomechanical/structural simulation methodologies to ensure high-accuracy consequence management outputs.
• Data Fusion & Analysis : Synthesize massive datasets from kinetic tests, physics-based simulations, and live exercises to conduct trade studies, perform root-cause analysis, and optimize survivability metrics.
• Technical Leadership : Mentor junior to mid-level engineering personnel at Fort Belvoir, establishing modeling best practices across multidisciplinary mission spaces.
• Interagency Collaboration : Present complex, data-driven simulation outcomes and operational insights regarding underground targets to executive DTRA leadership, combatant commands (COCOMs), and international defense partners. Required Qualifications
• Education : Bachelor's degree in Systems Engineering, Civil/Structural Engineering (with geo-mechanical focus), Physics, Applied Mathematics, Nuclear Engineering, Aerospace Engineering, or a highly relevant STEM discipline; Master's degree or Doctorate (Ph. D.) preferred.
• Experience : Minimum of 10+ years of progressive engineering experience, heavily focused on modeling, simulation, and analysis within the Department of Defense (DoD) or intelligence community space.
• Specialized Domain Expertise : Demonstrated experience modeling blast effects, geo-mechanical properties, or agent release mechanics associated with Underground Facilities (UGFs) or hardened structures.
• Core Toolsets : Proven, hands-on technical proficiency with specialized DoD hazard prediction toolsets, specifically Hazard Prediction and Assessment Capability (HPAC) and Vapor, Liquid, and Solid Tracking (VLSTRACK).
• Security Clearance : An active U.S. Government Top Secret / Sensitive Compartmented Information (TS/SCI) security clearance
• Technical Stack : Advanced programming proficiency in Python, C/C++, MATLAB, or Simulink for algorithmic tool modification and statistical data evaluation.
• M&S Frameworks : Mastery of Distributed Interactive Simulation (DIS), High-Level Architecture (HLA), Functional Mock-up Interface (FMI), or similar interoperability architectures.

Preferred Qualifications

• DTRA Domain Expertise : Deep working knowledge of DTRA RDT&E workflows, Defense Threat Reduction Information Analysis Center (DTRIAC) assets, or specialized weapon effect tools (e.g., IMEA, MALT).
• Grey Zone Competency : Prior experience modeling asymmetric warfare, counter-proliferation networks, or small unmanned aerial system (sUAS) threat signatures.

Company Description The Red Gate Group, founded in 2006, is a Service-Disabled Veteran-Owned Company based in Chantilly, VA. As an SDVOSB, the Red Gate Group has established a reputation for delivering quality multi-tiered services in intelligence analysis, strategic planning, program management, policy development, operational design, and technology integration. RGG delivers high-quality, customer-centric solutions around the world-from the foxhole to the highest levels of Government.

Our motto, "Making a Difference for Country and Client," reflects our deep commitment to national security and service excellence. As an employer of choice, we offer comprehensive benefits including flexible time off, 11 paid holidays, immediate 401(k) eligibility with a generous match, and full medical, dental, and vision coverage. Our employees enjoy 100% company-paid life insurance and disability benefits, along with professional development assistance for degrees and certifications.

We foster a culture of growth and work-life balance, backed by our commitment to supporting both our clients' missions and our employees' success. Join our team and be part of an organization that values both service excellence and employee wellbeing.