Senior Modeling Engineer - TS/SCI Polygraph Required

Leidos is seeking a highly skilled Modeling Engineer to support critical national security missions for the Defense Threat Reduction Agency and the Defense Intelligence Agency. This position focuses on advanced structural modeling of complex facilities, critical infrastructure, and target environments to enable Countering Weapons of Mass Destruction and Hard and Deeply Buried Target vulnerability and defeat assessments.The ideal candidate will bridge the gap between field-captured spatial data and high-fidelity analytical models. In this role, you will lead 3D Building Information Modeling efforts, manage cross-domain data movement between unclassified and classified networks, and perform field surveys using LiDAR and point cloud technologies.Key ResponsibilitiesStructural and Infrastructure ModelingBuild detailed, high-fidelity 3D BIM models of complex underground, hardened, and above-ground facilities, including structural framing, foundations, and critical utilities.Map complex system-of-systems connectivity, including structural dependencies, HVAC/MEP systems, communications, power, and operational equipment.Convert technical, operational, and intelligence data into precise spatial models to support blast, impact, structural integrity, and physical vulnerability simulations.Reality Capture and Field SurveyingExecute field data collection using terrestrial, aerial, and mobile LiDAR systems, handheld scanners, and photogrammetry tools.Process, clean, stitch, and georeference large point cloud datasets into actionable BIM environments using scan-to-BIM workflows.Participate in CONUS and OCONUS site surveys in dynamic environments to capture ground-truth physical characteristics.Cross-Domain Data Handling and ArchitectureManage model development across multiple classification levels, including Unclassified, Secret, and TS/SCI environments.Prepare, filter, and validate spatial and geometric data for high-to-low and low-to-high cross-domain transfer protocols.Maintain strict model security controls, ensuring attribution and metadata conform to Intelligence Community classification guidelines.Mission Support and Threat AssessmentCollaborate with weapon effects analysts, structural dynamicists, and intelligence specialists to support target vulnerability and defeat assessment pipelines.Quantify structural load paths, material properties, and failure modes under extreme loading conditions.Serve as a subject matter expert within the technical domain area.Deliver technical briefs, spatial analytical products, and interactive 3D visualizations to key Department of Defense decision-makers.Required QualificationsCandidates for consideration must possess an in-scope and active TS/SCI Polygraph clearance and the ability/willingness to maintain this clearance while holding this position. U.S. Citizenship is required.​In-depth understanding of technical principles, theories, concepts, and their application across a range of programs.Typically requires a bachelor’s degree in civil engineering, structural engineering, mechanical engineering, geographic information systems, or a related STEM field, and 12–15 years of relevant prior experience. A master’s degree is preferred.Relevant work experience includes structural or systems modeling, BIM workflows, and facility spatial analysis.Additional relevant experience may be considered in lieu of a degree.Proficiency with Autodesk Revit, Navisworks, AutoCAD, SolidWorks, Bentley Systems, including OpenBuildings or MicroStation, or other applicable modeling software.Hands-on experience with point cloud processing software, such as Autodesk ReCap, Leica Cyclone, FARO Scene, or CloudCompare.Direct experience conducting LiDAR scanning and photogrammetric site collections.Preferred QualificationsPrior experience supporting DTRA, DIA, U.S. Strategic Command, or U.S. Special Operations Command counter-threat missions.Familiarity with Hard and Deeply Buried Target design concepts, underground engineering, or hardened structures.Background with cross-domain transfer platforms, including CDS tools, guard solutions, and data sanitization standard operating procedures.Understanding of finite element analysis or computational fluid dynamics modeling integration, such as Ansys or LS-DYNA.Knowledge of GIS platforms, including ArcGIS Pro, and CAD-to-GIS integration workflows.#ASBA#SnakeheadIf you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.Original Posting:August 14, 2026For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.Pay Range:Pay Range $131,300.00 - $237,350.00The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.SummaryLocation: Reston, VAType: Full time