Linux Administrator

Job#: 3028202

Job Description:
Linux Administrator

Location: Arlington, Virginia (Remote)

Employment Type: Contract

Role Overview

We are seeking a Linux Administrator to support, maintain, and enhance Linux-based systems that enable enterprise Identity, Credential, and Access Management (ICAM) functions. This role is responsible for the secure, stable, and compliant operation of infrastructure components that support authentication, authorization, and identity lifecycle processes. Daily responsibilities include supporting developers and performing code reviews.

Key Responsibilities

• Manage, configure, and maintain Linux servers such as RHEL, Oracle Linux, or Ubuntu.
• Perform system patching, vulnerability remediation, system hardening, and lifecycle management.
• Support ICAM tools and services, including IAM directories, federation services, PKI components, and privileged access systems.
• Implement and maintain security baselines like DISA STIGs and CIS Benchmarks.
• Develop scripts using Bash, Python, or Ansible to automate administrative tasks and deployments.
• Troubleshoot operating system and application-level issues and participate in on-call rotations for service events.
• Collaborate with ICAM architects, cybersecurity personnel, and network and application teams.

Required Qualifications

Experience: 7-8+ years of relevant experience.

Technical Skills:

• Strong knowledge of Linux administration, including system services, networking, storage, and SELinux.
• Experience with identity or security services such as LDAP, SSO, federation, certificates, PAM, and SSSD.
• Scripting experience with Bash, Python, or Ansible.
• Familiarity with logging platforms like Splunk or ELK and other monitoring tools.
• Understanding of IAM concepts including authentication, authorization, identity lifecycle, RBAC, and MFA.

Certifications: Security+ or an equivalent certification is required.

Clearance: Candidates must be able to obtain and/or maintain a Department of Defense (DoD) Secret Security Clearance as a condition or continuation of employment.

Compensation & Benefits

The pay rate for this position is between $65.00 and $75.00 per hour. Specific compensation will be determined based on experience, skills, and qualifications.

This employer is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.

Apex uses a virtual recruiter as part of the application process. Click for more details.

If you have visited our website in search of information on employment opportunities or to apply for a position, and you require an accommodation in using our website for a search or application, please contact our Benefits Department at or

Apex Systems is a world-class IT services company that serves thousands of clients across the globe. When you join Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRated's Best of Staffing in Talent Satisfaction in the United States and Great Place to Work in the United Kingdom and Mexico. Apex uses a virtual recruiter as part of the application process. Click for more details.

Apex Benefits Overview: Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection. We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure. Apex also offers a HSA (Health Savings Account on the HDHP plan), a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions, a corporate discount savings program and other discounts. In terms of professional development, Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach. You can access a full list of our benefits, programs, support teams and resources within our 'Welcome Packet' as well, which an Apex team member can provide.