PSG is seeking an experienced Senior Linux Systems Administrator (SME) to support mission-critical environments, including a Centralized Supercomputing Facility (CSCF) High Performance Computing (HPC) environment and other government programs.

In this role, you will support large-scale Linux infrastructure, troubleshoot complex system issues, and help maintain highly secure, high-performance computing environments. You'll work closely with engineers, support teams, and mission users to ensure systems remain stable, secure, and optimized for performance.

This is an excellent opportunity for a hands-on Linux expert who enjoys solving complex system problems and supporting advanced computing platforms.

Locations: Littleton, CO • King of Prussia, PA / Valley Forge, PA • Herndon, VA • Springfield, VA

Key Responsibilities

• Provide Linux system administration expertise supporting HPC and enterprise environments

• Troubleshoot complex system and kernel-level issues using debugging tools and system logs

• Support High Performance Computing (HPC) environments, including system performance and stability

• Develop and maintain automation scripts to improve system management and operational efficiency

• Manage and maintain Linux patching and repository management using Satellite Server

• Build and maintain custom Linux kernels to address functionality or security requirements

• Automate system configuration and maintenance using tools such as Ansible

• Support and maintain identity and access management systems, including LDAP and token-based authentication

• Collaborate with engineering and infrastructure teams to ensure system security, availability, and performance

• Assist with diagnosing system outages, performance bottlenecks, and operational issues

Required Qualifications

• Active TS/SCI with CI Polygraph (required to start)

• Bachelor's degree in Computer Science, Information Systems, or related field

• 10+ years of professional experience in Linux systems administration or related field

• At least 5 years of experience working in heterogeneous, multi-platform computing environments

• Strong experience with Linux system administration and troubleshooting

• Proficiency with Bourne/Bash scripting and Expect scripting

• Experience debugging Linux kernel issues, including reviewing source code and analyzing system logs

• Experience using Linux debugging and performance tools such as crash and systemtap

• Experience managing Satellite repositories for patching and kernel updates

• Experience automating system configuration and maintenance using Ansible and Satellite Server

• Experience with identity management systems, including LDAP and token-based authentication

Preferred Qualifications

• Experience supporting High Performance Computing (HPC) environments

• Experience working in classified or highly secure environments

• Familiarity with large-scale Linux infrastructure or supercomputing systems

• Experience improving system reliability and automation across enterprise environments