Principal Civil Engineer

** Description*
* ** Principal Civil Engineer (TS/SCI Required)*
* *
* Location:

** Reston, VA

Leidos is seeking an accomplished  
** Principal*
* ** Civil Engineer
** to support high-priority national security missions in Reston, Virginia. This role focuses on the assessment, reverse engineering, and characterization of complex above-ground and subterranean facilities located in denied-access environments.

The successful candidate will leverage extensive engineering expertise to reconstruct facility layouts, operational workflows, and supporting infrastructure associated with chemical, biological, radiological, and nuclear (CBRN) industrial processes. Through detailed analysis of facility design, operations, and infrastructure, you will identify vulnerabilities, assess potential threat vectors, and provide critical engineering insights that support mission planning and decision-making.

This position requires a highly experienced engineer who can develop sound technical assessments in environments where complete information is rarely available. The ideal candidate combines creativity, engineering rigor, and exceptional analytical skills with a meticulous attention to detail. As a senior technical leader, you will collaborate with interdisciplinary teams of government and contractor professionals while serving as a trusted subject matter expert in support of complex intelligence and defense missions.

Work is performed in a fast-paced, mission-focused environment within a government facility.

** Primary Responsibilities*
* ** Reverse Engineering & Characterization*
* Analyze and characterize complex industrial processes, equipment configurations, and facility designs to determine functional attributes, operational capabilities, and mission relevance.

** Subterranean & Hardened Facility Analysis*
* Evaluate the structural design, geological overburden, and survivability of underground facilities (UGFs) and deeply buried hardened structures.

** 3D Modeling & Simulation*
* Utilize advanced CAD and engineering simulation tools to develop accurate 3D models of facilities, underground structures, floor plans, utility systems, and supporting infrastructure.

** Vulnerability & Resilience Assessments*
* Conduct detailed structural and functional analyses to identify systemic weaknesses, single points of failure, and assess the resilience of critical infrastructure against a range of threat vectors.

** Workflow & Infrastructure Analysis*
* Evaluate facility support systems and operational workflows, including specialized HVAC systems, power distribution networks, utility infrastructure, and structural integrity considerations.

** Technical Reporting & Briefing*
* Develop comprehensive engineering assessments, reports, and technical products in accordance with Intelligence Community standards. Present findings, technical analyses, and recommendations to senior government and Department of Defense stakeholders.

** Subject Matter Expertise & Technical Leadership*
* Serve as a recognized subject matter expert within your technical domain, providing authoritative engineering guidance and supporting multidisciplinary teams addressing complex mission challenges.

** Required Basic Qualifications*
* +  
** Security Clearance:
** Active  
** TS/SCI clearance
** required.  
** Must be a*
* ** U.S. Citizen** .

+  
** Demonstrated expertise
** in engineering principles, theories, concepts, and their application across a broad range of highly complex programs and mission requirements.

+ Master's degree with 15+ years of relevant experience, or a Doctorate with 13+ years of relevant experience.

+  
** Relevant
* * experience includes facility analysis, infrastructure vulnerability assessments, and structural engineering within commercial, Department of Defense, or Intelligence Community environments.

+  
** Industrial & Facility Focus:
** Proven experience analyzing chemical, nuclear, or biological industrial processes and their associated facility footprints, including both above-ground facilities and subterranean environments.

+  
** MEP Systems Knowledge:
** Strong multidisciplinary understanding of Mechanical, Electrical, and Plumbing (MEP) system design, integration, and operational functionality within complex industrial or military facilities, including specialized containment, filtration, and backup power systems.

** Preferred Qualifications*
* +  
** Weapons Effects & Survivability:
** Experience or training in blast mitigation, weapons effects, or structural hardening principles.

+  
** Geotechnical Engineering:
** Knowledge of rock mechanics, tunneling engineering, or geomechanics as applied to the analysis of deeply buried underground facilities (UGFs).

+  
** BIM Expertise:
** Experience with Autodesk Revit or other Building Information Modeling (BIM) platforms for multidisciplinary coordination, MEP integration, and advanced facility visualization.

+  
** Advanced Simulation:
** Experience utilizing BIM data to support engineering simulations, blast effects analysis, or…