L3 Systems Admin - STL
Listed on 2026-10-12
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IT/Tech
Systems Administrator, Windows Server
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!
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.
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, Net Backup 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 .
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