Nuclear Physicist

Intreped Partners and its wholly owned subsidiary, Global Systems Engineering LLC (GSE), are a HUBZone small business supporting federal, state, and military partners across the defense, energy, and environmental sectors. We partner with our clients to tackle complex, high-impact challenges that directly support national security and mission success.

At GSE, integrity, trust, and collaboration aren’t just values—they’re how we work. Our team is made up of professionals who are passionate about solving real-world problems and committed to making a meaningful difference.

GSE is currently seeking a Nuclear Physicist to support the Defense Threat Reduction Agency (DTRA) Technical Reachback team in Fort Belvoir, Virginia. This position provides scientific and technical analysis and advice related to Chemical, Biological, Radiological, Nuclear, and Explosive (CBRNE) threats in support of DTRA Reachback customers. Customers include military teams, emergency responders, and interagency partners within the Department of War (DoW), Combatant Commands, Department of Homeland Security, Federal Emergency Management Agency, and other federal organizations.

To be qualified, the candidate MUST be a U.S. citizen and be eligible to obtain a Top Secret (TS) security clearance with Sensitive Compartmented Information (SCI) access. An active security clearance at the time of application is not required.

This position requires a strong technical foundation in nuclear physics and/or related nuclear sciences, including the ability to evaluate nuclear and radiological hazards, assess technical information, and communicate complex scientific concepts to operational and non-technical audiences. Following receipt of the required security clearance, this position is primarily on site at Fort Belvoir, VA and requires shift work; shifts can vary and expand over multiple days at a time.

Tasks assigned to this position include:

· Conduct technical analyses and risk assessments related to nuclear and radiological threats, hazards, and incidents

· Respond to Requests for Information (RFI) from DoW military and civilian personnel

· Provide professional scientific opinions and technical advice related to nuclear and radiological threats and risk mitigation

· Analyze technical data and scientific literature to support time-sensitive operational requirements

· Collaborate with multidisciplinary scientific and technical staff to address complex CBRNE-related questions

· Provide technical briefings and training to DoW military and civilian personnel

· Conduct research and development projects in collaboration with other DTRA departments and technical organizations

· Translate complex nuclear science and technical information into clear, actionable information for operational decision-makers

Qualifications:

· M.S. or Ph.D. in Nuclear Physics or a closely related technical discipline

· Entry-level through experienced candidates will be considered; relevant nuclear or radiological research, laboratory, operational, or postdoctoral experience is preferred

· Eligible to obtain a Top Secret clearance with SCI access (current TS/SCI clearance preferred)

· Knowledge of nuclear and radiological phenomena, hazards, effects, detection, or related technical applications

· Knowledge of DoW and CBRNE operations and research applications preferred

· Willingness to be cross trained to provide modeling and information across the CBRNE spectrum.

· Strong analytical and problem-solving skills

· Strong written and verbal communication skills

· Experience with Microsoft 365 suite of products