Facilities Mechanical Engineer

Description

Facilities Mechanical Engineer - Mission-Critical Facilities Design

Leidos is seeking a driven and detail-oriented Facilities Mechanical Engineer to support the planning, design, and analysis of mechanical systems-primarily Heating, Ventilation, and Air Conditioning (HVAC)-for secure, mission-critical operations. 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. You will be expected to provide engineering level support for existing systems and work with other disciplines to resolve site issues.

We are able to sponsor the clearance process for qualified candidates; however, our preference is to onboard individuals who already hold an active clearance at any level. This role supports a TS/SCI with Polygraph, and Leidos can maintain that clearance for the position.

What You'll Do

• Analyze the design and layout of HVAC systems, including ductwork, piping, ventilation, and equipment selection for high-availability environments.
• Collaborate with electrical, architectural, and structural teams to deliver integrated solutions.

• 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.

• Perform 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.

• ManageBuilding Management Systems (BMS) for centralized control of HVAC, lighting, and life safety systems.

Basic Qualifications

• Ability to obtain a Top Secret/SCI with Polygraph clearance
• Bachelor's degree in Mechanical Engineering

• 4+ years of relevant experience

• Understanding of design specifications and documentation standards

• Experience with facilities HVAC equipment design, management, and support

• Strong communication skills and ability to work across multidisciplinary teams

• Excellent organizational skills and attention to detail

Preferred Qualifications

• Any level of active clearance.
• Active Top Secret/SCI with Polygraph.
• Mechanical Fundamentals of Engineering (FE) exam or Professional Engineers (PE) exam passed

• Experience with Siemens Insight, Siemens Desigo, Tridium, or Iginition

• Proficiency in CAD software (e.g. AutoCad, Revit)

• Ability to contribute independently to moderately complex engineering projects

• Ability to apply engineering standards and best practices in documentation and design

EC-DAS

If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo - because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 - and moving faster than anyone else dares.

Original Posting:February 10, 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 $87,100.00 - $157,450.00

The Leidos pay range for this job level is a general guideline onlyand 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.

About Leidos

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

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

Securing Your Data

Beware of fake employment opportunities using Leidos' name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system - never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at View email address on click.appcast.io.

If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission.

Commitment to Non-Discrimination

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.