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.

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.

We’re not looking for perfectly polished resumes or perfect fits. We’re looking for people who break limits, ask hard questions, and don’t wait to be told what’s next. At Leidos, we’re not following the roadmap — we’re redrawing it. 

Original Posting:

October 26, 2025

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.

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.