Windows / Linux System Administrator

100% on-site in Annapolis Junction, MD *This position is on-site and requires a Secret Clearance. * *Job-Specific Essential Duties and Responsibilities:* - Manage and support enterprise telephony systems across these programs, including hardware, software, peripherals, and call applications such as WFO/WFM, CMS, and call recording platforms.- Install, configure, operate, monitor, and maintain enterprise infrastructure, including web servers (e.g., IIS), application servers, and telecom hardware (e.g., Dell PowerEdge servers, Anaya J Series phones). - Install, configure, troubleshoot, and resolve issues related to telephony systems, Windows / Linux servers, network connectivity, and system integrations with Active Directory, DNS, DHCP, and LDAP.- Collaborate with cross-functional teams to implement telephony solutions that ensure high availability, call quality, and compliance with security and performance standards. - Apply regular and emergency patches to Windows / Linux Server environments to maintain security and compliance. - Perform system upgrades and migrations, including planning, testing, and execution.- Conduct regular system health checks and preventive maintenance. - Coordinate with security teams to address audit findings and implement appropriate remediations.- Other tasks as assigned. *Job-Specific Minimum Requirements:* - Active Secret security clearance. - Due to contract requirements, only US Citizens can be considered. Candidates with dual citizenship cannot be considered. - 7+ years of relevant experience in systems administrator or systems engineering. - Experience with Windows / Linux Server environments, including installation, patching, and troubleshooting. - Experience with telephony platforms, including Avaya and call recording/workforce management applications. - Experience with VMware environments, including ESXi and vCenter, for installation, upgrades, troubleshooting, and ESXi certificate management. - Networking experience includes IPv4 / IPv6, ports/protocols, and monitoring. - Familiarity with remediation and validation of security vulnerabilities in a Windows / Linux Server environment.- Proficiency with managing and monitoring infrastructure, including telephony peripherals and server systems. - Knowledge of client/server certificate management. - Experience with Active Directory and Group Policy Administration. - Candidates must reside within a commutable distance for daily onsite work and on-call requirements. - This contract supports systems that require 24x7x365 uptime. Candidates must be willing and able to meet recall requirements, including participation in a rotational on-call schedule. *Preferred/Desirable Skills:* - Prior DHS suitability - Scripting experience (PowerShell, Shell scripting) - Experience with virtualization technologies (VMWare) - Experience with Microsoft SQL Server and PostgreSQL databases - Demonstrated experience with Active Directory and Group Policy administration - Experience with security vulnerability remediation and validation Pay: $90,000.00 - $100,000.00 per year Work Location: In person