Mechanical Engineer

Description 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.

If you're passionate about mechanical engineering, eager to learn through mentorship, and ready to contribute to projects that matter, we want to hear from you.

• 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.

• Current Top Secret SCI security clearance and the ability to pass a polygraph.
• Bachelor's degree in Mechanical Engineering or related field
• 2-4 years of relevant experience with a Bachelor's, or