Critical Facility Technician - TS​/SCI Polygraph

Critical Facility Technician 3 - TS/SCI with Polygraph

Apply for the Critical Facility Technician 3 - TS/SCI with Polygraph role at M.C. Dean, Inc.

M.C. Dean is Building Intelligence@. We design, build, operate, and maintain cyber‑physical solutions for the nation’s most mission‑critical facilities, secure environments, complex infrastructure, and global enterprises. With over 7,000 employees, our capabilities span electrical, electronic security, telecommunications, life safety, automation and controls, audiovisual, and IT systems. Headquarters in Tysons, Virginia, M.C. Dean delivers resilient, secure, and innovative power and technology solutions through engineering expertise and smart systems integration.

Applicants selected will be subject to a government security investigation and must meet eligibility requirements, including U.S. Citizenship, for access to classified information.
Applicant must hold an active Top‑Secret SCI with Poly clearance.

Continued employment for this role will be dependent on the ability to meet customer security requirements, including the requirement to provide a valid passport for site access.

Responsible for ensuring that all electrical, mechanical, and fire/life safety equipment within the data center is operating at peak efficiency. This involves both planned preventative maintenance of equipment, daily corrective work, and emergency response to emergent issues. The technician serves as an expert technical resource reporting to a program manager, interacting with Onsite Engineering Operations (OEO) and any third‑party vendors. They are expected to be a singular focal point for all facility operations within a given data center and to support operated data centers.

Data center equipment that supports mission‑critical servers must maintain better than 99.999% uptime.

• Reaches all requirements of CET 2 and has mechanical and/or electrical OEM factory specific training or experience (preferred).
• Uses safe working practices; can apply lockout/tagout, SDS, and good housekeeping methods.
• Reads and interprets wiring diagrams, blueprints, floor plans, construction documents, mechanical riser drawings, OEM operating and maintenance instructions, job specifications, and MOP/SOP’s.
• Uses hand tools and test equipment to install, troubleshoot, and repair new or replacement parts for existing mechanical and electrical equipment covered under CET3 classified procedures according to specifications and safety guidelines, relying on MOP’s, manufacturer's literature, and industry best practices to perform tasks under supervision, and logs activities in CMMS.
• Assists a CET3/4 technician with CET3 classified procedures (MOP/SOP) associated with the site/campus they are based; and transfers knowledge and trains other technicians.
• Daily walk‑through of facility documenting parameters such as power availability, temperature and humidity, alarm status, etc. to be catalogued and compared for identification of discrepancies and trends.
• Conversant in site‑specific processes and procedures such as procedure creation and review standards, procedure instructions and templates, how to report an incident or outage, procedure execution, PM standards, CMMS standards and policy, work order and notification, as well as the use of SharePoint to access CE procedures and training content.
• Understands how to action all site primary and secondary EOP’s, focusing on mastering the first responder role during an emergency, and is fully conversant on how to complete drills associated with the site primary and secondary EOP’s.
• Understands the function, purpose, nominal operating parameters, and how to operate/isolate and start up: MV/LV Distribution Boards, MV/LV Breakers, UPS, Generator, Batteries, STS, ATS, AHU, DX units, Chillers, Evap Washer Systems, CRAC Units, Fuel Systems, ASCO Systems, BMS System, EPMS System, and Fire Alarm System.
• Conversant of the BMS and EPMS systems and the impact of any state change, capable of navigating the system, interpreting alarms, and able to perform controlled shutdowns/start‑ups/equipment rotations.
• If…