Facilities Mechanical Engineer
Company: Leidos
Location: Manassas
Posted on: January 5, 2026
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Job Description:
Job Description Description Senior Mechanical Engineer Leidos is
seeking a seasoned and innovative Senior Mechanical Engineer to
lead the design, maintenance, and configuration management of
complex building mechanical systems across a secure site. This role
demands deep technical expertise, strategic vision, and hands-on
leadership in systems such as air handlers, chillers, boilers, and
pumping infrastructure. The ideal candidate thrives in
multidisciplinary environments and brings a proven ability to
troubleshoot, optimize, and elevate mechanical and control systems
performance. This role may be eligible for a sign-on incentive,
which could include additional PTO or a monetary bonus. Key
Responsibilities Lead end-to-end mechanical design from concept
through production, ensuring robust, efficient, and compliant
systems. Partner with Operations & Maintenance (O&M) teams to
drive proactive and responsive maintenance strategies. Collaborate
cross-functionally with electrical, systems, and architectural
teams to ensure integrated, mission-ready designs. Perform rigorous
analyses to validate mechanical performance in operational
environments. Author and review technical documentation , including
engineering reports, design packages, and maintenance policies.
Oversee construction and renovation efforts , ensuring mechanical
scope aligns with strategic goals, budgets, and timelines.
Establish and refine facility standards , maintenance protocols,
and site-specific operating procedures. Troubleshoot complex system
issues , recommending and implementing corrective actions with
precision. Produce detailed AutoCAD drawings , submittals, and
specifications tailored to site requirements. Basic Qualifications
Current Top Secret SCI security clearance and the ability to pass a
polygraph. Bachelor’s in Mechanical Engineering with 8–12 years of
experience, or Master’s with 6–10 years. Registered Professional
Engineer (PE) in good standing or ability to obtain PE within a
reasonable time frame. Minimum 8 years of experience designing HVAC
and plumbing systems for commercial, industrial, or government
facilities. Strong command of building and energy codes; capable of
performing load calculations, duct and piping layouts, and
equipment sizing. Expertise in AutoCAD and familiarity with
EMCS/FMCS systems . Demonstrated ability to resolve complex,
multidisciplinary technical challenges. Exceptional communication
skills; able to engage senior leadership and stakeholders on
technical strategy and execution. Proven success in developing and
implementing commercial HVAC systems. Preferred Qualifications
Current Polygraph Recognized Subject Matter Expert (SME) in
mechanical systems. PE certification. Field experience in
mechanical construction, systems integration, and testing.
Proficiency in project management: scheduling, budgeting, and
resource planning. 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: October 26, 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, Dale City , Facilities Mechanical Engineer, Engineering , Manassas, Virginia
