Intermediate Linux System Administrator – Infrastructure/Touch Labor

Leidos; Greater London; On-site; GBP 40,000 - 80,000; Full time

Job summary

An established industry player is seeking an Intermediate Linux System Administrator to provide essential on-site support for a critical defense project. This role involves managing and optimizing Linux servers, ensuring security compliance, and automating tasks to enhance operational efficiency. The ideal candidate will have a solid background in Linux infrastructure, strong troubleshooting skills, and a passion for maintaining high system availability. Join a team that values innovation and collaboration, and play a key role in supporting national security initiatives.

Qualifications

• 4+ years of experience in Linux system administration.
• Active Secret clearance required.
• DoD 8570 IAT Level II certification needed.

Responsibilities

• Provide on-site support in a data center environment.
• Manage and optimize Linux servers.
• Implement security best practices and automation.

Skills

Linux Administration

Scripting

Security Best Practices

Troubleshooting

Collaboration

Education

Bachelor's degree

Master's degree

Tools

Ansible

Puppet

AWS

SCAP

STIGs

Job description

Description

Leidos is a FORTUNE 500 company bringing a mix of innovative technology and sector expertise to customers in the national security, engineering, and health industries. Leidos is seeking an Intermediate Linux System Administrator for a position supporting the Defense Information Security Agency (DISA) in Columbus, OH. This is an onsite position; no full-time telework is allowed.

Primary Responsibilities:

1. Provide on-site support in a data center environment.
2. Manage, configure, and optimize Linux servers (Ubuntu, CentOS, RHEL, etc.).
3. Validate current security posture and perform system configuration changes to enhance security.
4. Use Security Content Automation Protocol (SCAP) and Security Technical Implementation Guides (STIGs) to maintain security and system hardening.
5. Perform routine maintenance, updates, and patch management.
6. Troubleshoot server issues and resolve them promptly.
7. Monitor system performance to ensure high availability and uptime.
8. Implement security best practices, including firewall configurations and access controls.
9. Automate tasks using scripting and configuration management tools (e.g., Ansible, Puppet).
10. Manage storage solutions, backup strategies, and disaster recovery plans.
11. Collaborate with IT teams to support applications and services.
12. Maintain documentation for configurations, procedures, and troubleshooting.
13. Support operational continuity and response as needed.
14. Conduct technical analysis and produce documentation such as SOPs, troubleshooting guides, and reports.

Basic Qualifications:

1. Bachelor's degree with 4+ years of relevant experience or Master's with 2+ years; additional experience may substitute for education.
2. Active Secret clearance and pass a drug test.
3. DoD 8570 IAT Level II certification (e.g., CompTIA Security+).
4. 3–5 years supporting Linux infrastructure in production environments.
5. Understanding of server architecture and datacenter operations.
6. Experience with core network services (DNS, DHCP, NTP) in Linux environments.
7. Familiarity with security frameworks/tools like SCAP, STIGs, IAVMs.
8. Knowledge of cryptographic principles.
9. Strong communication and collaboration skills.
10. Dependable, detail-oriented, with organizational skills.
11. Analytical and troubleshooting skills for complex Linux issues.

Preferred Qualifications:

1. At least 1 year scripting and automation experience.
2. Experience with SSL/TLS, S/MIME, authentication, encrypted file systems, code signing.
3. Experience with AWS cloud services.
4. Ability to install and configure software, firmware, upgrades, and security patches.
5. Ability to optimize and improve existing infrastructures.