Principal Mechanical Engineer SME
Leidos • Reston, VA • Posted June 29, 2026
About the Role
**Description**
**Principal Mechanical Engineer (TS/SCI Required)**
**Location:** Reston, VA
Leidos is seeking an experienced **Principal Mechanical 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 analyze facility designs, spatial layouts, operational workflows, and supporting infrastructure to determine functional capabilities and mission relevance. You will evaluate facility systems, model critical infrastructure, identify vulnerabilities, and provide technical insights that support complex intelligence and defense initiatives.
This position requires a highly experienced engineer who can develop sound technical assessments in situations where complete informatio...
**Principal Mechanical Engineer (TS/SCI Required)**
**Location:** Reston, VA
Leidos is seeking an experienced **Principal Mechanical 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 analyze facility designs, spatial layouts, operational workflows, and supporting infrastructure to determine functional capabilities and mission relevance. You will evaluate facility systems, model critical infrastructure, identify vulnerabilities, and provide technical insights that support complex intelligence and defense initiatives.
This position requires a highly experienced engineer who can develop sound technical assessments in situations where complete informatio...