Facilities Mechanical Engineer

Company: Leidos
Location: Reston
Posted on: January 5, 2026

Job Description:

Job Description Description Leidos is seeking an experienced Facilities Mechanical Engineer to lead the design, maintenance, and configuration management of building mechanical systems across mission-critical sites. This role demands deep technical expertise, creative problem-solving, and leadership in projects involving air handlers, chillers, boilers, pumping systems, and other complex mechanical infrastructure. The ideal candidate will have a strong background in managing and troubleshooting mechanical and control systems in dynamic environments. Primary Responsibilities Lead mechanical design and development efforts from concept through production. Create and review AutoCAD design documents, submittals, and site-specific specifications. Collaborate with cross-functional teams—including electrical, systems, software, and manufacturing—to ensure mechanical designs meet all functional and environmental requirements. Conduct engineering analyses to validate mechanical designs under operational conditions. Develop and maintain comprehensive site documentation. Troubleshoot design and maintenance issues; recommend and implement corrective actions. Ensure compliance with applicable building codes, energy standards, and industry regulations. Basic Qualifications Ability to obtain and maintain a TS/SCI with Polygraph Bachelor’s degree in Mechanical Engineering with 8–12 years of relevant experience, or Master’s degree with 6–10 years. Additional experience may be considered in lieu of degree. Minimum of 8 years of experience in mechanical systems design, including HVAC and plumbing, for commercial, industrial, or government facilities. Strong working knowledge of building codes, energy standards, and regulatory frameworks. Proven ability to perform heating and cooling load calculations, ductwork sizing/layout, piping system design, and equipment selection. Demonstrated expertise in CAD tools such as AutoCAD. Experience developing mechanical systems for commercial HVAC applications. Ability to effectively communicate with stakeholders, contractors, and regulatory authorities. Familiarity with Facility Management Control Systems (FMCS). Active Professional Engineer (PE) license or ability to obtain licensure within one year of hire. Preferred Qualifications Experience troubleshooting and repairing control system 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: December 5, 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 $107,900.00 - $195,050.00 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. 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 www.Leidos.com. 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 www.leidos.com/careers/pay -benefits. 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 LeidosCareersFraud@leidos.com. 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.

Keywords: Leidos, Centreville , Facilities Mechanical Engineer, Engineering , Reston, Virginia