Senior Linux Systems Administrator - TS/SCI Clearance

Leidos; Maryland; On-site; USD 131,000 - 237,000; Full time

Benefits offered by this job

Sign-on bonus $10,000

Paid time off

11 paid holidays

401(k) with 6% match

Flexible schedules

Education and training support

Job summary

Leidos is seeking a Principal Linux Systems Administrator to support mission-critical production environments in a secure setting. The role emphasizes independent management, automation, security hardening, and system reliability across diverse Linux platforms.

The ideal candidate brings extensive Linux experience, strong networking skills, and the ability to drive root-cause analysis and improvements while adhering to change-management processes. A TS/SCI with polygraph is required.

Qualifications

• Bachelor’s degree in a technical discipline or equivalent experience.
• 15 years of directly related experience in complex programs and contracts.
• Extensive hands-on Linux systems administration experience (RHEL/Ubuntu or equivalent).
• Experience with Linux account/permission management, patching, services, and virtualization/cloud (VMware/AWS EC2).
• Strong networking knowledge (DNS, DHCP, TCP/IP, routing, firewalls).
• Experience with Linux security hardening, vulnerability remediation, and change-control processes.
• Experience scripting/automation with Bash, Python, Ansible; strong documentation practices.
• Active TS/SCI with polygraph security clearance.

Responsibilities

• Administer, secure, monitor, and troubleshoot Linux systems supporting mission-critical workloads.
• Lead root-cause analysis of complex OS, app, storage, auth, performance, and network issues.
• Manage lifecycle activities: accounts, permissions, patching, packages, services, upgrades.
• Maintain compliance and security baselines; implement Linux hardening standards.
• Develop automation/configuration-management solutions (Ansible, Bash, Python).
• Document SOPs, runbooks, configurations, and change records.

Skills

Linux administration

Root-cause analysis

Networking fundamentals

Scripting (Bash/Python)

Automation

Education

Bachelor's degree in a technical discipline

Tools

Ansible

Python

Bash

Terraform

AWS EC2

Kubernetes

Splunk

Job description

Leidos is seeking a Principal Linux Systems Administrator to support mission-critical production environments in a secure setting. The role emphasizes independent management, automation, security hardening, and system reliability across diverse Linux platforms.

The ideal candidate brings extensive Linux experience, strong networking skills, and the ability to drive root-cause analysis and improvements while adhering to change-management processes. A TS/SCI with polygraph is required.