Mechanical Engineer

Mechanical Engineer – Mission-Critical Facilities Design

Leidos is seeking a driven and detail-oriented Junior level Mechanical Engineer to support the planning, design, and analysis of mechanical systems—primarily Heating, Ventilation, and Air Conditioning (HVAC)—for secure, mission-critical operations across government, commercial, and institutional facilities. This is a growth-focused role where you’ll work alongside senior engineers to develop high-performance, energy-efficient, and code-compliant systems that support 24/7 operations.

This role may be eligible for a sign‑on incentive, which could include additional PTO or a monetary bonus.

• Assist in the design and layout of HVAC systems, including ductwork, piping, ventilation, and equipment selection for high‑availability environments.
• Prepare and maintain construction drawings and specifications using AutoCAD, Revit MEP, or similar tools.
• Support system load calculations, energy modeling, and equipment sizing using tools like Trace 700, HAP, or eQUEST.
• Participate in field surveys, site investigations, and facility condition assessments.
• Assist with commissioning, testing, and balancing to ensure optimal system performance.
• Review submittals, respond to RFIs, and support construction administration activities.
• Ensure all designs meet applicable codes and standards (ASHRAE, NFPA, IBC, IMC, LEED).
• Maintain organized documentation including technical memos, reports, and as‑built drawings.
• Gain hands‑on experience with Building Management Systems (BMS) for centralized control of HVAC, lighting, and life safety systems.
• Collaborate with electrical, architectural, and structural teams to deliver integrated solutions.

• Bachelor’s degree in Mechanical Engineering or related field
• 2–4 years of relevant experience with a Bachelor’s, or < 2 years with a Master’s
• Ability to obtain a TS/SCI with Polygraph clearance
• Working knowledge of static and dynamic analysis techniques
• Proficiency in CAD software (e.g., Solid Works, AutoCAD)
• Understanding of design specifications, dimensioning, and documentation standards
• Experience supporting prototype fabrication, testing, and feasibility studies
• Strong communication skills and ability to work across multidisciplinary teams
• Solid foundation in thermal analysis, hardware design, and product development
• Excellent organizational skills and attention to detail

• Current Top Secret SCI security clearance and the ability to pass a polygraph
• Master’s degree in Mechanical Engineering or related discipline
• Experience with Solid Works Simulation, ANSYS, or other FEA/thermal tools
• Hands‑on experience in prototyping and iterative product development
• Ability to contribute independently to moderately complex engineering projects
• Familiarity with project management tools and principles
• Knowledge of manufacturing processes and DFM best practices
• Exposure to hardware design in regulated environments (e.g., aerospace, defense, medical)
• Ability to apply engineering standards and best practices in documentation and design

Pay Range $69,550.00 - $

Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit

Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available at

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