Senior Mechanical Engineer - Critical Defense Systems

Leidos; Reston (VA); On-site; USD 131,000 - 237,000; Full time

Job summary

Leidos in Reston, Virginia seeks an experienced Senior Mechanical Engineer to support national security missions by assessing, reverse engineering, and characterizing complex facilities in denied-access environments.

You will analyze layouts, model infrastructure, identify vulnerabilities, and deliver technical reports and CAD/BIM outputs for DoD stakeholders, collaborating with government and contractor teams.

Qualifications

• Active TS/SCI polygraph clearance and US citizenship.
• Bachelor's degree with 12+ years or Master's with 10+ years in relevant field.
• Experience in facility analysis, infrastructure vulnerability, and DoD/IC environments.
• Strong MEP knowledge across mechanical, electrical, and plumbing systems.
• Ability to assess HVAC equipment and system capacity via visual analysis.
• Experience interpreting drawings, layouts, and data from multiple sources.
• Proven judgment with incomplete information and clear communication.

Responsibilities

• Reverse engineering and characterize facilities in denied-access environments.
• Assess vulnerabilities, bottlenecks, and mission impacts.
• Create high-fidelity 3D models and run engineering simulations.
• Analyze supporting facility systems, focusing on MEP integration.
• Produce technical reports, CAD/BIM outputs, and simulations for DoD.
• Support R&D to advance methodologies and modeling capabilities.
• Act as subject matter expert within the technical domain.

Skills

TS/SCI clearance

Engineering principles

3D modeling

Data analysis

Decision making with incomplete data

Interdisciplinary collaboration

Education

Bachelor's degree +12y experience

Master's degree +10y experience

Tools

MEP systems design

CAD/BIM tools

3D modeling software

Job description

Leidos in Reston, Virginia seeks an experienced Senior Mechanical Engineer to support national security missions by assessing, reverse engineering, and characterizing complex facilities in denied-access environments.

You will analyze layouts, model infrastructure, identify vulnerabilities, and deliver technical reports and CAD/BIM outputs for DoD stakeholders, collaborating with government and contractor teams.