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.
- Create and review AutoCad design documents and submittals.
- Collaborate with cross-functional teams (electrical, systems, software, manufacturing) to ensure mechanical designs meet all functional and environmental requirements.
- Conduct analyses to validate proposed mechanical designs will function in operational environments.
- Develop and maintain site documentation.
- Troubleshoot design and maintenance issues, recommending and implementing corrective actions. Prepare AutoCAD construction drawings and prepare site-specific specifications.
Basic Qualifications
- TS/SCI with Polygraph clearance is required
- 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. Additional years of experience can be considered in lieu of degree.
- Minimum of 8 years of experience in mechanical systems design, including HVAC and plumbing, for commercial, industrial, and/or government facilities
- Strong working knowledge of applicable building codes, energy standards, and industry regulations
- Proven ability to perform heating and cooling load calculations, ductwork sizing and layout, piping system design and distribution, and equipment sizing and selection
- Demonstrated expertise in CAD tools such as AutoCad.
- Proven track record of developing mechanical systems for commercial HVAC systems. Ability to discuss project related items with stakeholders, contractors, and related authorities.
- FMCS systems familiarity.
- Active Professional Engineer (PE) license or the ability to obtain licensure within one year of hire
Preferred Qualifications
- Experience troubleshooting and fixing controls systems.
EC-DAS
Come break things (in a good way). Then build them smarter.
We're the tech company everyone calls when things get weird. We don’t wear capes (they’re a safety hazard), but we do solve high-stakes problems with code, caffeine, and a healthy disregard for “how it’s always been done.”
Original Posting:September 29, 2025For 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.
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.
Top Skills
What We Do
We Are Leidos
For 50 years we have been tackling some of the biggest problems that face our nation and our world.
OUR MISSION
Through our culture of innovation and history of performance, we develop deep customer trust built on integrity and create enduring solutions that improve our world. Leidos is a science and technology solutions leader working to address some of the world’s toughest challenges in the defense, intelligence, homeland security, civil, and healthcare markets. The company’s 43,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Va., Leidos reported annual revenues of approximately $11.09 billion for the fiscal year ended January 3, 2020.
Leidos was cited for the meaningful work employees perform that is challenging, impactful, and aligned with our customers’ missions as reasons professionals want to work and stay at our company. Leidos has also been named to lists including Forbes’ Best Employers for Diversity, Forbes’ America’s Best Employers for Women, Military Times Best for Vets Employers, and Ethisphere Institute’s World's Most Ethical Companies®.
Employees enjoy career enrichment opportunities available through mobility and development and experience rewarding relationships with supportive supervisors and talented colleagues and customers. Employees appreciate our flexible work environment, allowing for and encouraging a true work-life balance. Our professionals are also excited about our Employee Resource Groups, like the newly launched Collaborative Outreach with Remote and Embedded Employees (CORE), which strives to create an environment where every employee, regardless of location, feels fully engaged as a valued employee of Leidos.
Your most important work is ahead.
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