Facility Security Officer
CastellumMaryland, United States
Posted April 7, 2026
100000 - 140000 USD
Full Time
About the Company
Castellum (NYSE: CTM) is a technology firm focused on acquiring and integrating advanced capabilities in cyber security, information warfare, and electronic warfare. Leveraging a strategic acquisition model, the company rapidly expands its portfolio through targeted purchases, beginning with its first acquisition in November 2019. Castellum delivers comprehensive cyber defense, intelligence, and program-management solutions to defense and commercial clients, supported by GSS, PSS, and Navy Seaport-e contract vehicles. Its distinct advantage lies in combining deep technical expertise with agile integration to deliver end-to-end security and information technology services. The company fosters a collaborative culture that prioritizes innovation, operational excellence, and rapid deployment of mission-critical solutions.
Job Description
GTMR is seeking an experienced Facility Security Officer (FSO) to manage our industrial security program in accordance with the National Industrial Security Program Operating Manual (NISPOM) and other applicable government requirements.
Requirements
- Active Top-Secret Security clearance
- Minimum 10 years of experience as an FSO or similar role supporting DoD programs
- Thorough knowledge of NISPOM, CUI requirements, and related federal regulations
- Experience with DISS/NBIS and Insider Threat Program management
- Experience with DCSA National Industrial Security System (NISS) and facility inspections
- Familiarity with APACS and SPOT programs
- FSO Program Management for Possessing and/or Non-Possessing Facilities training
- Excellent written and verbal communication skills
- Strong attention to detail and customer-service mindset
- Ability to work independently and interface confidently with senior leadership, government representatives, and contractors
- Willingness to be on call for alarms or security incidents after hours as needed
Benefits
- Generous Paid Time Off
- 401k Matching
- Retirement Plan
