Linux System Administrator

When You Love the Work You Do, Any Mission Is Possible

Position:Senior System Administrator (15+years of experience required)

***(Active Clearance with a Full Scope Poly Required)

We’re on multiple contracts and have many opportunities. It is encouraged if applicants don’t meet all the technical requirements to still apply.

Join Our Team:

Investing in our employees’ growth is a cornerstone of our philosophy. Joining Tiber means access to ongoing learning opportunities, mentorship, and a supportive environment that supports professional development. We believe in providing the tools and resources for our team to thrive and excel in their careers. We recognize that our collective strength lies in the diversity of our talents. Our collaborative work environment encourages cross functional teamwork, idea sharing, and a collective pursuit of excellence. Your skills and perspectives will be integral to our shared success.

Position Description:

We are looking for an experienced Linux Systems Administrator to support the installation, maintenance, and security of a complex technical environment. The ideal candidate will be skilled in Linux administration (CentOS and/or RHEL), virtualization, patching, scripting, and compliance tasks. This role requires both hands-on technical expertise and the ability to follow and contribute to established operational procedures.

Key Responsibilities

• Install, configure, and maintain Linux systems (CentOS and RHEL).
• Troubleshoot Linux performance, connectivity, and storage-related issues.
• Build, configure, and maintain virtual machines (VMs).
• Perform system patching using YUM and ensure compliance with security directives.
• Review and act on vulnerability reports, support IAVA compliance, and manage POA&Ms.
• Manage PKI certificates – renewing and revoking as needed.
• Utilize Nessusfor scanning and monitoring.
• Administer Nagios for system monitoring and alerting.
• Apply and maintain configurations using Ansible playbooks and ad hoc commands.
• Develop and maintain SOPs using Confluence.
• Support compliance and monitoring
• Write and maintain intermediate-level shell scripts for automation.
• Use Git for version control, including check-ins, branching/tagging, and repository management.

Required Skills and Experience

• Strong hands-on experience with Linux systems administration (CentOS and/or RHEL).
• Proficient in VM maintenance: creation, configuration, and troubleshooting.
• Familiar with reading and interpreting vulnerability reports and ensuring system compliance.
• Experience with system patching via YUM.
• Working knowledge of Ansible: writing playbooks, executing commands, and managing configurations.
• Comfortable working with PKI, including certificate renewal and revocation processes.
• Skilled in shell scripting for automation and system tasks.
• Familiarity with STE tools such as Trellis Agent, Nessus, ENSL, and UAM.
• Experience with Nagios administration and alert tuning.
• Proficient in Git for source control: repository management, branching, tagging.
• Experience documenting procedures and processes in Confluence.

Requirements:

• Must be a U.S. citizen.
• Must hold an active clearance with a Full Scope Polygraph
• Bachelor’s degree in computer science, engineering, or related field
• 15 years of professional experience
  

Physical Requirements:

• This position involves sedentary work with physical requirements expected for at least 50% of the time. Essential functions include prolonged periods of sitting, standing, walking, and talking.
• Reasonable accommodation may be made to enable individuals with disabilities to perform essential functions.

EEO Employer:

Tiber Technologies is an Equal Opportunity and Affirmative Action Employer. As a company who is committed to inclusion and diversity in the workplace, it is our policy to prohibit discrimination and harassment of any kind based on race, color, sex, religion, sexual orientation, national origin, disability, pregnancy, veteran status, or any other protected characteristic as outlined by federal, state, and local laws. Our hiring decisions are based solely on merit, qualifications and business needs at the time. This policy applies to all employment practices within our organization including recruiting, hiring, promotion, layoff, compensation, benefits, and training.