L3 Systems Admin - STL

Job#: 3044854 Job Description: Level 3 Systems Administrator Apex Systems is hiring for Level 3 Systems Adminisrators with a large government and aerospace supporting client in St. Louis, MO! Position requires a currently active, DoD-issued Interim Secret Security Clearance or higher. If interested in apply, please apply directly online or email a copy of your updated resume to Melissa at [email protected] (Please reference Job ID: 3044854 when emailing) Location: 100% on-site in St. Louis, MO Contract Type/Duration: W2 Contract; Long-term rolling Pay Rate: $30-44/hour (depending upon experience) Requirements: Candidates must be US Citizens with the ability to obtain and/or maintain an active Interim Secret Security Clearance or higher level as a condition and continuation of employment CompTIA Security+ CE certfication required prior to starting Minimum 5 years of relevant systems administration experience Overview: The Level 3 Systems Administrator is a senior technical role responsible for end-to-end user support, design, and lifecycle management of enterprise infrastructure. This position serves as the highest escalation point for complex technical issues and plays a critical roles in configuration, change, and release management while acting as a technical representative to customers and program leadership. Key Responsibilities: Provide end‑to‑end hardware and software support for: Windows and Unix/Linux servers, High Performance Computing (HPC) systems Development, production, and application server environments Desktop systems and supporting infrastructure Network systems Lead and execute configuration, change, and release management activities Perform advanced troubleshooting, root cause analysis, and permanent remediation of complex system issues Manage asset lifecycle, including tracking, maintenance, and disposition Implement, enforce, and maintain compliance with client and customer technical standards Serve as a senior technical escalation point and subject matter expert Develop deep program and customer knowledge to effectively represent CNO services Build and maintain strong working relationships with customers, engineers, and management Produce and maintain technical documentation and operational procedures Execute tasks and projects as directed by Management Extensive hands‑on experience with: Windows Server 2008 and Windows 7 (required) Windows Server 2012 and Windows 8 (preferred) VMware virtualization platforms (ESX 5.1 or higher) Active Directory administration Group Policy Object (GPO) deployment and troubleshooting HP server hardware Strong understanding of enterprise server, network, and infrastructure environments Excellent written and verbal communication skills Ability to work independently in a dynamic, fast‑paced environment Preferred Qualifications: Experience administering server roles such as SQL, Web, and Exchange Experience with: WSUS, SAN technologies, NetBackup or enterprise backup solutions Experience writing, editing, and maintaining technical documentation Prior experience supporting classified or regulated environments #clearance Please note that as a contract employee of Apex Systems, benefits include the below with employee contribution* Health Dental Vision Life Insurance; Short Term Disability Hospitalization Coverage Direct Deposit Weekly Pay Periods Training and Development Programs 401k Referral Program EEO Employer 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. By applying for this job, you agree to receive calls, AI-generated calls, text messages, or emails from Everforth Apex and its affiliates, and contracted partners. Frequency varies for text messages. Message and data rates may apply. Carriers are not liable for delayed or undelivered messages. You can reply STOP to cancel and HELP for help. You can access our privacy policy at https://www.apexsystems.com/privacy-policy 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. Everforth 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. Everforth Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law. If you require an accommodation under the Americans with Disabilities Act to participate in an interview with a virtual recruiter or to use our website for a search or application, please contact our Benefits Department at [email protected] or 804-523-8228. Please note that this contact information is strictly to be used for medical ADA accommodations and that no other inquiries will be answered. UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Everforth Apex Systems. © 2026 Everforth, Inc. All rights reserved. Everforth Apex Systems is part of the Commercial Segment of Everforth, Inc. NYSE: EFOR 4400 Cox Road Suite 200 Glen Allen, Virginia 23060 Everforth Apex 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. Everforth 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 Benefits Department at [email protected] or 804-523-8228. (Do not submit resumes or solicit consultants to this email address). UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Everforth Apex.