Sr Principal Systems Administrator

Job#: 3034515

Job Description:

Sr Principal Systems Administrator

Location: Aurora, Colorado (Onsite)

Employment Type: Contract

Role Overview

A position is available for a Principal / Sr. Principal System Administrator to join a team for a role based in Aurora, Colorado. This role involves performing as a Linux and Windows System Administrator on large government contracts and maintaining the smooth operation of multi-user computer systems.

Key Responsibilities

• Perform as a Linux and Windows System Administrator on large government contracts.
• Administer VMware technologies or related platforms.
• Manage all aspects of Network Attached Storage (NAS).
• Maintain the operation of multi-user computer systems, coordinating with various engineering and technical teams.
• Recommend and implement system enhancements for performance and reliability, including installation, patching, monitoring, and configuration.
• Provide backup and recovery services; manage file systems, disk space, and virus protection.
• Create and maintain user and computer accounts and manage file permissions and security access lists.
• Maintain security audit and logging information as directed by the Information Systems Security Manager (ISSM).
• Support the Cyber Security team.
• Report on project status for all recurring and non-recurring efforts.

Required Qualifications

Clearance: Candidates must be able to obtain and/or maintain a Top Secret (TS) security clearance with Sensitive Compartmented Information (SCI) eligibility and a Full Scope Polygraph (FSP) as a condition of employment.

Education & Experience:

• Principal: Bachelor's degree with 5+ years of IT experience; Master's degree with 3+ years of IT experience; Associate degree with 7+ years of IT experience; or a HS Diploma / GED with 9 years of IT experience.
• Sr. Principal: Bachelor's degree with 8+ years of IT experience; Master's degree with 6+ years of IT experience; Associate degree with 10+ years of IT experience; or a HS Diploma / GED with 12+ years of IT experience.

Technical Skills & Certifications:

• Server administration experience with Linux (RedHat Enterprise Linux preferred) and Windows.
• Experience with administration of VMware technologies or related systems.
• A DOD 8570 IAT Level 2 baseline certification (e.g., Security+ CE) is required, or the ability to obtain one within 6 months of the start date.
• Experience with NAS storage device administration (preferably NetApp ONTAP 8.x or higher; CDOT).

Additional Requirements:

• Ability to lift equipment weighing up to 40 pounds.
• Ability to support after-hours and on weekends as needed.
• Willingness to travel up to 15%.

Preferred Qualifications

• A higher degree in a STEM-related discipline.
• Experience with network hardware and configuration.
• 5+ years of experience with Red Hat Enterprise Linux (RHEL) server administration in an SCI classified environment.
• Experience operating under and managing systems within NISPOM Chapter 8, DCID 6/3-ICD 503, RMF, STIG, JAFAN, or JSIG information system environments.
• Understanding of Enterprise-level storage concepts, including commonly used RAID-levels.
• Experience remediating security vulnerabilities and hardening Linux systems in accordance with RMF and STIGs.
• Identity Management (Single Sign-On) experience.
• VMware and ESXi (6.x or higher) configuration and management experience.
• Experience with host-based firewall implementations and configuration (e.g., Redhat "iptables").
• Windows 10 administration, Windows Server, Group Policies (GPOs), and Active Directory management experience.
• Documentation skills using Wiki pages and SharePoint sites.
• DoD 8570 Certification in a primary OS (Windows, Linux, Cisco).
• Currently valid Security+ CE, CASP, CISSP, or similar security certification.
• Experience with VMWare, NetApp, and Splunk; comfortable with maintenance and OS upgrades.
• Familiarity with Tenable and Nessus scans for vulnerability and controls implementation.

Compensation and Benefits

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.

Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. 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 Employee Services Department at [email protected] or 844-463-6178.

Everforth Apex is a world-class IT services company that serves thousands of clients across the globe. When you join Everforth 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 ClearlyRateds Best of Staffing in Talent Satisfaction in the United States and Great Place to Work in the United Kingdom and Mexico. Everforth Apex uses a virtual recruiter as part of the application process. Click here for more details.

Everforth Apex Benefits Overview: Everforth 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. Everforth 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, Everforth 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. Everforth 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 Everforth Apex team member can provide.

Employee Type:

Contract

Location:

Aurora, CO, US

Job Type:

Engineering and Technicians

Date Posted:

May 19, 2026

Pay Range:

$75 - $140 per hour

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