Senior Systems Administrator
About The Position
We are seeking a Senior Systems Administrator (SELinux / MLS SME) to support a mission-critical enterprise Multi-Level Security (MLS) configuration team. This role supports highly secure computing environments, including the Centralized SuperComputing Facility (CSCF) and other classified programs. In this position, you will serve as a Linux security expert, specializing in SELinux and MLS configurations within large-scale enterprise and high-performance computing environments. You will help design, implement, and troubleshoot secure Linux systems while supporting advanced computing environments and mission-critical infrastructure. This is a highly technical role for a Linux security specialist who enjoys solving complex system challenges and working in advanced secure environments.
Requirements
- Active TS/SCI with CI Polygraph (required to start)
- Bachelor's degree in Computer Science, Information Systems, or related field
- 10+ years of experience in Linux systems administration or related technical roles
- At least 5 years of experience working in heterogeneous, multi-platform computing environments
- Deep expertise with SELinux configuration and Multi-Level Security (MLS) environments
- Experience with: SELinux policies and policy debugging Mandatory Access Control (MAC) labeling Security contexts Developing least-access policies MLS FreeIPA configurations MLS Ethernet interface networking
- Proficiency in Bourne/Bash and Expect scripting
- Experience debugging Linux kernel issues, including analyzing system logs and source code
- Experience using Linux debugging tools such as crash and systemtap
- Experience managing Satellite repositories for patching and kernel management
- Familiarity with Ansible and Satellite Server for configuration and patch automation
- Experience working with identity management systems, including LDAP and token-based authentication
Nice To Haves
- Experience supporting High Performance Computing (HPC) environments
- Experience supporting enterprise MLS or cross-domain solutions
- Familiarity with large-scale Linux infrastructure in classified environments
- Experience improving automation, security, and system reliability across enterprise platforms
Responsibilities
- Serve as a Subject Matter Expert (SME) for SELinux and Multi-Level Security (MLS) configurations across enterprise Linux environments
- Support secure Linux environments for enterprise systems and High Performance Computing (HPC) infrastructure
- Configure and maintain SELinux policies, security contexts, MAC labeling, and least-access policies
- Troubleshoot and debug SELinux policy and kernel-level issues using system logs and debugging tools
- Develop and maintain secure MLS configurations, including MLS FreeIPA and secure networking configurations
- Write and maintain automation and operational scripts using Bourne/Bash and Expect
- Manage Linux patching and repository management using Satellite Server
- Build and maintain custom Linux kernels to meet functionality and security requirements
- Implement automation for configuration and patching using Ansible and Satellite Server
- Support and maintain identity and access management systems, including LDAP and token-based authentication
- Collaborate with engineering and infrastructure teams to ensure systems remain secure, compliant, and highly available
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What This Job Offers
Job Type
Full-time
Career Level
Mid Level
