Senior Geotechnical Engineer - TS/SCI Poly Required

Leidos is seeking a Senior Geotechnical Engineer to join our Analysis Solutions Group in Reston, Virginia. This highly specialized role supports critical national security missions through advanced geologic and geotechnical analysis of underground, hardened, and complex infrastructure facilities. As a senior member of a multidisciplinary team, you will apply your expertise in geology, geotechnical engineering, geomechanics, and subsurface characterization to help reverse engineer and assess facilities in some of the world's most challenging environments. You will support the development of innovative methodologies, analytical processes, and emerging technologies used to characterize, model, and assess above- and below-ground structures and their surrounding geology. This position offers the opportunity to solve complex technical problems, conduct cutting-edge analysis, contribute to technology development efforts, and directly support high-priority government missions. The successful candidate will serve as a trusted technical advisor and subject matter expert, working in a fast-paced, mission-focused environment alongside leading scientists, engineers, analysts, and government personnel.

Serve as a senior technical expert in geotechnical engineering, engineering geology, and subsurface characterization. Conduct advanced geotechnical assessments using open-source information, commercial and classified imagery, intelligence reporting, and geospatial data to characterize geological and engineering properties of sites and facilities. Analyze soil, rock, and geologic conditions to support the assessment of underground and hardened infrastructure. Utilize geospatial technologies, including ArcGIS Pro and ArcGIS Enterprise , along with vector and raster datasets, to evaluate and document site geology and geotechnical conditions. Develop technical assessments, reports, and briefings that clearly communicate findings, risks, and conclusions to customers and stakeholders. Provide scientific, technical, and systems engineering support for the development of innovative technologies, sensors, and methodologies used to identify, characterize, and assess geotechnical conditions in denied or difficult-to-access environments. Plan and execute field investigations, surveys, and data collection efforts within the United States and internationally. Apply geological expertise to projects involving borehole investigations, soil characterization, fault analysis, rock mass characterization, and subsurface engineering assessments. Conduct field research and produce detailed technical documentation to support mission requirements. Lead the development of new technical approaches, analytical methods, and operational solutions that advance mission capabilities. Brief senior government officials, technical leaders, and mission stakeholders on emerging trends, analytical findings, and technical assessments.

Clearance Required: Candidates for consideration MUST possess an active, current Top Secret/SCI clearance WITH polygraph , and the ability and willingness to maintain this clearance while holding this position. Bachelor's degree in Engineering Geology, Geology, Mining Engineering, Geotechnical Engineering , or a related discipline.​ 12+ years of relevant experience, or master's degree with 10+ years of relevant experience. Strong background in: Geomechanics Geotechnical engineering Field geophysics Computer modeling and simulation Tunnel and slope stability analysis Rock mass characterization ​ Advanced proficiency with geotechnical engineering software, including: PLAXIS SLOPE/W (GeoStudio) Slide LPILE gINT ​ Experience with GIS technologies, including ArcGIS Pro and ArcGIS Enterprise , and familiarity with MATLAB. Experience conducting geotechnical investigations, field data collection, and technical research. Working knowledge of drilling operations, core logging, mining operations, tunnel design