Mechanical Engineer - TS​/SCI Poly

Overview

M.C. Dean is Building Intelligence®. We design, build, operate, and maintain cyber-physical solutions for the nation’s most recognizable mission critical facilities, secure environments, complex infrastructure, and global enterprises. The company’s capabilities include electrical, electronic security, telecommunications, life safety, automation and controls, audio visual, and IT systems. M.C. Dean is headquartered in Tysons, Virginia, and employs more than 7,000 professionals who engineer and deploy automated, secure, and resilient power and technology systems;

and deliver the management platforms essential for long-term system sustainability.

Our people are inspired by the way engineering and innovation enhance customer outcomes, improve lives, and change the world for the better. We are driven by our core values of agility, expertise, and trust.

Applicants selected will be subject to a government security investigation and must meet eligibility requirements, including U.S. Citizenship, for access to classified information;
Active TS/SCI clearance required to start. Candidates must be willing and able to obtain a Polygraph as a condition of continued employment.

Must have passed the NCEES Fundamentals of Engineering (FE) exam.

Applicant must successfully meet all customer-imposed requirements. Such requirements may include, but are not limited to, completion of a customer-provided weapons qualification program, successful completion of customer-directed medical screening, and fulfillment of any additional training, certifications, or evaluations as required by the customer.

We are seeking a skilled Mechanical Engineer to lead and support design, bid, and execution of mechanical systems work within a facilities operations and maintenance environment. This role requires technical expertise, field coordination, and project ownership from concept through completion.

• Design Work
• Develop and review mechanical system designs (HVAC, piping, plumbing, and related infrastructure)
• Perform load calculations, equipment sizing, and system layouts using AutoCAD/Revit and relevant software
• Ensure all designs comply with applicable codes, standards, and sustainability goals
• Bid Work
• Create scopes of work, technical specifications, and detailed bid packages
• Evaluate contractor proposals and assist with bid selection and procurement strategy
• Participate in pre-bid meetings and respond to RFIs as needed
• Run Work (Execution & Oversight)
• Provide technical oversight during construction, repair, or retrofit projects
• Coordinate closely with contractors, field technicians, and stakeholders
• Perform site inspections, submittal reviews, punch lists, and ensure project quality and compliance
• Monitor schedules and budgets, resolving issues to maintain project delivery standards
• Facilities Support
• Provide engineering support for ongoing operations, preventive maintenance planning, and system troubleshooting
• Collaborate with facilities managers and maintenance teams to identify system upgrades or lifecycle replacements
• Maintain as-built documentation and contribute to asset management systems

• Bachelor’s degree in mechanical engineering, or a related engineering discipline
• 7+ years of progressive experience in mechanical design, project execution, or facilities engineering
• Applicants selected will be subject to a government security investigation and must meet eligibility requirements, including U.S. Citizenship, for access to classified information;
  Active TS/SCI clearance required to start. Candidates must be willing and able to obtain a Polygraph as a condition of continued employment.
• Must have passed the NCEES Fundamentals of Engineering (FE) exam
• Proficiency in HVAC, plumbing, mechanical systems, and construction management
• Experience with AutoCAD, Revit, MS Project, and engineering software (e.g., Carrier HAP, Trane Trace)
• Familiarity with ASHRAE standards, IBC, and local building codes
• Strong communication, coordination, and documentation skills

• Work within government, commercial,…