Assistant Facility Security Officer

Consequential Work. Dedicated People. About Onebrief Onebrief builds collaboration and AI-powered workflow software for military planning and operational coordination. Military planning is complex by nature, requiring teams to coordinate information, people, and decisions across systems and locations. Onebrief brings planning, collaboration, simulation, and AI into one connected environment, helping teams test strategies, adapt to changing conditions, and make decisions with greater clarity when the stakes are real. We are a distributed team of builders from military, operational, and technology backgrounds who care deeply about improving how important work gets done. Some team members work remotely, while others work directly alongside customers in operational environments around the world. Founded in 2019, Onebrief is backed by leading investors including General Catalyst, Battery Ventures, Insight Partners, Sapphire Ventures, and Human Capital. Valued at more than $2 billion, we continue to invest in product innovation, AI capabilities, and team growth. Why This Role Exists As our business and cleared workforce grow, so does the complexity of supporting a strong, responsive, and scalable industrial security program. We’re adding an Assistant Facility Security Officer (AFSO) to help us meet that growth; to ensure our people are supported, our day-to-day security operations run smoothly, and the details that keep our program running are handled accurately and reliably. Working closely with the FSO, you’ll help turn security requirements into clear, reliable, and efficient processes . You’ll keep important workflows moving, make it easier for employees to navigate security requirements, and look for opportunities to improve how we work as we scale. Ultimately, this role exists to help us build a security program that does more than maintain compliance: one that enables the business, serves our people, and earns trust through operational excellence .

Keep the day-to-day administrative operations of our industrial security program organized, accurate, and moving forward , while supporting the FSO in maintaining the company’s National Industrial Security Program (NISP). Coordinate personnel security (PERSEC) processes, including clearance processing, onboarding and offboarding of cleared personnel, briefings and debriefings, visit requests, and personnel security records. Maintain accurate, complete, and well-organized security records, files, trackers, procedures, and required documentation. Administer security activities and maintain accurate information across government systems such as DISS, NISS, NBIS, JPC, and ACCS , as applicable. Serve as a responsive and trusted resource for employees navigating clearance, access, and security-related questions. Support preparation for DCSA security reviews and assessments , ensuring documentation is organized, current, and audit-ready and tracking corrective actions through completion. Support the company’s Insider Threat Program and coordinate with relevant stakeholders on required reporting and security matters. Identify opportunities to simplify or automate repetitive work and create systems that make our security operations more efficient and scalable. Perform FSO responsibilities when delegated or when serving as backup to the FSO.

Bachelor’s degree or equivalent professional experience. Exceptional organizational skills and attention to detail , with a track record of managing complex administrative work accurately and reliably. Strong ownership and follow-through; able to keep track of commitments, anticipate what needs attention, and consistently close the loop. Ability to manage multiple priorities, deadlines, and detail-sensitive workflows without sacrificing accuracy. A demonstrated ability to learn new systems, processes, and subject matter quickly and apply that knowledge effectively. Strong written and verbal communication