**Description**

Leidos' Analysis Solutions business area is seeking a highly accomplished **Principal Nuclear Engineer Subject Matter Expert (SME)** to support critical national security missions in Reston, Virginia. This role offers the opportunity to apply advanced nuclear engineering expertise to some of the nation's most challenging counterproliferation and nuclear survivability problems.

The successful candidate will lead technical assessments of foreign nuclear weapons infrastructure, reverse engineer protective hardening measures, and identify vulnerabilities across facilities, processes, and supply chains. This unique position combines computational physics, engineering analysis, and all-source intelligence methodologies to deliver actionable insights that strengthen national security.

As part of a multidisciplinary government-contractor team, you will conduct in-depth analysis of above-ground and underground facilities, associated equipment, and op...