Job Description

We are seeking a highly experienced Senior Mechanical Engineer to lead the design, maintenance, and configuration management of site building mechanical systems. The ideal candidate will bring strong technical knowledge, creativity, and leadership to site projects involving air handlers, chillers, boilers, pumping systems, and many other mechanical systems. Candidate should have experience managing and troubleshooting mechanical and control systems.
Primary Responsibilities:

• Lead mechanical design and development efforts from concept through production.

• Collaborates with O&M teams, ensuring timely and effective preventive and corrective maintenance.

• Collaborate with cross-functional teams (electrical, systems, architecture) to ensure mechanical designs meet all functional and environmental requirements.
• Conduct analyses to validate proposed mechanical designs will function in operational environments.
• Review and contribute to the creation of engineering documentation, technical reports, maintenance policies, and design packages.
• Oversees mechanical aspects of construction and renovation projects from design through completion, ensuring alignment with strategic objectives, budgets, and timelines.
• Develops, interprets, and implements facility maintenance policies, standards, and best practices.
• Develop and update design standards and site-specific operating procedures in order to establish common practices.
• Troubleshoot design and maintenance issues, recommending and implementing corrective actions.
• Prepare AutoCAD construction design drawings, submittals and prepare site-specific specifications.

Basic Qualifications

• TS/SCI with Polygraph
• Requires Bachelors degree in Mechanical Engineering and 8-12 years of prior relevant experience or a Masters degree in Mechanical Engineering with 6-10 years of prior relevant experience.
• Must be a Registered Professional Engineer in good standings in the United States or have the ability to obtain a PE in a reasonable time period.
• At least 8 years of experience with mechanical systems design including HVAC and plumbing systems with commercial, industrial and/or government facilities
• Must have current and relevant knowledge of building and energy codes and standards in order to be able to perform heating and cooling load calculations, ductwork sizing and layout, piping calculations and distribution, sections/elevations, and equipment sizing and selection. Understanding of energy efficiency and sustainable design practices.
• Demonstrated expertise in CAD tools such as AutoCad.
• Ability to resolve highly complex, multi-disciplinary technical problems across mechanical systems.
• Strong communication skills with the ability to engage senior leadership and customer on technical solutions, project requirements, goals, and design.
• Proven track record of developing mechanical systems for commercial HVAC systems. Ability to discuss project related items with stakeholders, contractors, and related authorities.
• EMCS/FMCS systems familiarity.

Preferred Qualifications

• Recognized subject matter expert (SME).
• PE (Professional Engineer) certification
• Experience with mechanical construction, systems integration, and testing in field environments.
• Proficiency in project management methodologies, including scheduling, budgeting, and resource planning.
• Experience with reactive maintenance for building mechanical systems.

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: October 15, 2025
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 $104,650.00 - $189,175.00
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.

Skills Required