Senior IT System Administrator - Contingent

System AdministratorAt Ares Enterprise, we deliver cutting-edge IT, cybersecurity, and mission assurance solutions to support our nation's defense operations. We are looking for a dedicated System Administrator to join our elite technical team supporting critical Department of Defense (DoD) command and intelligence communication systems.We are seeking an experienced Senior IT System Admin Certified Professional to form the core technical support team for day-to-day administration, maintenance, and security of a secure, mission-critical enterprise operating environment. In this role, you will ensure seamless system availability, robust cybersecurity posture, and high-quality technical support for operational users.Key ResponsibilitiesSystem & Network Administration: Perform daily system administration tasks on Windows and/or Linux servers, including user account management, patching, and applying Security Technical Implementation Guides (STIGs). Manage and troubleshoot network infrastructure devices such as switches, routers, and firewalls.User & VTC Support: Provide direct Tier 1 and Tier 2 support to end-users for technical issues, including Video Teleconference (VTC) setup and troubleshooting, account resets, and software support. Escalate complex issues to senior specialists or external vendors as needed.Security Operations: Monitor security logs, respond to alerts, and assist with incident response, vulnerability remediation, and COMSEC compliance activities. Ensure systems are backed up and that disaster recovery plans are thoroughly tested.Technical Execution: Provide skilled technical support across all operational performance areas as assigned, adapting seamlessly to emerging technologies and requirements.Required Qualifications & Technical SkillsExperience: Minimum of 5+ years of relevant IT experience in a complex enterprise environment, adhering to ITES-3S labor category standards.Certifications: Must possess at a minimum a current IAT Level II industry-standard certification (e.g., CompTIA Security+, CCNA, RHCSA, MCSA) meeting DoD 8570/8140 requirements.Technical Skills:Proven hands-on skills in network and system administration (Windows/Linux).Comprehensive hardware, software, and network troubleshooting abilities.Familiarity with COMSEC procedures, device management, and secure environment protocols.Strong customer support background within a secure, classified environment.Security Clearance: Must possess and maintain an active Top Secret security clearance with SCI eligibility