Mechanical Engineer

Leidos and its Multi-Domain Solutions (MDS) division are seeking a highly motivated Junior Mechanical Engineer to support the planning, design, and analysis of mechanical systems-primarily Heating, Ventilation, and Air Conditioning (HVAC)-for mission-critical operations across government, commercial, and institutional facilities. This role offers the opportunity to work under the mentorship of senior engineers and contribute to system layout, equipment selection, energy modeling, and construction documentation. The ideal candidate possesses a solid foundation in mechanical engineering principles, a passion for learning, and a commitment to delivering energy-efficient, reliable, and code-compliant designs.

Primary Responsibilities

• Assist in the design and layout of HVAC systems, including ductwork, piping, ventilation, and equipment selection for 24/7 mission-critical environments.
• Prepare, revise, and maintain construction drawings and specifications using AutoCAD, Revit MEP, or similar design software.
• Support mechanical system load calculations, energy modeling, and system sizing using tools such as Trace 700, HAP, or eQUEST.
• Participate in field surveys, site investigations, and facility condition assessments.
• Assist with commissioning, testing, and balancing of mechanical systems to ensure optimal performance and compliance.
• Review submittals, respond to Requests for Information (RFIs), and support construction administration activities.
• Ensure all designs and documentation adhere to applicable building codes and standards including ASHRAE, NFPA, IBC, IMC, and LEED.
• Maintain organized engineering documentation including reports, technical memos, 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 cross-functional teams including electrical, architectural, and structural disciplines.

Basic Qualifications

• Active TS/SCI with Polygraph
• Bachelor's degree in Mechanical Engineering or a related field.
• 2-4 years of relevant engineering experience with a Bachelor's degree, or less than 2 years with a Master's degree.
• Working knowledge of static and dynamic analysis techniques for mechanical systems and equipment.
• Proficiency in CAD software (e.g., SolidWorks, AutoCAD) for mechanical design and drafting.
• Understanding of design specifications, dimensioning, and documentation standards.
• Experience supporting prototype fabrication, design testing, and feasibility studies.
• Strong collaboration skills and ability to communicate technical concepts clearly across multidisciplinary teams.
• Familiarity with mechanical engineering fundamentals such as thermal analysis, hardware design, and product development.
• Excellent organizational and documentation skills with keen attention to detail.

Preferred Qualifications

• Master's degree in Mechanical Engineering or a related discipline.
• Experience with SolidWorks Simulation, ANSYS, or other FEA/thermal analysis tools.
• Hands-on experience in prototyping and iterative product development.
• Proven ability to contribute independently to moderately complex engineering projects.
• Familiarity with project management tools and principles, particularly in product development environments.
• Knowledge of manufacturing processes and design for manufacturability (DFM) best practices.
• Exposure to hardware design in regulated environments (e.g., aerospace, defense, medical).

EC-DAS

At Leidos, we don't want someone who "fits the mold"-we want someone who melts it down and builds something better. This is a role for the restless, the over-caffeinated, the ones who ask, "what's next?" before the dust settles on "what's now."

If you're already scheming step 20 while everyone else is still debating step 2... good. You'll fit right in.

Original Posting:
January 9, 2026

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:
Pay Range $69,550.00 - $125,725.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.