Facilities Mechanical Engineer

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.

• 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.

• 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 the 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.

• 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.

Posted October 26, 2025.

For U.S. Positions: the job requisition is anticipated to remain open for at least 3 days.

$ – $

Req Number: R-

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.

Leidos is an equal opportunity employer.