Windows / Linux System Administrator

Windows / Linux Systems Administrator — Telephony InfrastructureLocation: Annapolis Junction, MDSchedule: Full-time | OnsiteClearance: Active Secret clearance requiredSalary Range: $90,000–$100,000 annuallyThe OpportunityWe are hiring an experienced Windows / Linux Systems Administrator to support internal enterprise telephony systems for a Homeland Security mission.This role combines systems administration, telephony, virtualization, networking, and security. You'll provide hands-on technical expertise across Windows and Linux servers while supporting the infrastructure behind critical voice and call-management services.This position is onsite in Annapolis Junction, Maryland and supports systems requiring 24x7x365 availability.What You'll DoManage and support enterprise telephony environments, including hardware, software, peripherals, and applications such as WFO/WFM, CMS, and call recording , configure, operate, monitor, and maintain enterprise infrastructure, including IIS web servers, application servers, telecom hardware, Dell PowerEdge servers, and Avaya J Series phones.Troubleshoot and resolve issues involving telephony platforms, Windows and Linux servers, network connectivity, and system integrations with Active Directory, DNS, DHCP, and LDAP.Work across technical teams to implement telephony solutions supporting high availability, call quality, security, and performance requirements.Apply scheduled and emergency patches to Windows and Linux Server environments to maintain security and compliance.Plan, test, and execute system upgrades and system health checks and preventive maintenance.Coordinate with security teams to address audit findings and implement appropriate other assigned responsibilities as needed.What You'll BringAn active Secret security clearance.U.S. citizenship. Due to contract requirements, candidates with dual citizenship cannot be considered.7+ years of relevant experience in systems administration or systems engineering.Experience administering Windows and Linux Server environments, including installation, patching, troubleshooting, and ongoing support.Experience with telephony platforms, including Avaya and call recording/workforce management with VMware environments, including ESXi and vCenter, covering installation, upgrades, troubleshooting, and ESXi certificate management.Networking experience involving IPv4/IPv6, ports and protocols, and monitoring.Familiarity with the remediation and validation of security vulnerabilities in Windows and Linux Server environments.Proficiency managing and monitoring infrastructure, including telephony peripherals and server systems.Knowledge of client/server certificate management.Experience with Active Directory and Group Policy to reside within a commutable distance of Annapolis Junction, MD for daily onsite work and on-call responsibilities.Willingness and ability to meet recall requirements for systems requiring 24x7x365 uptime, including participation in a rotational on-call schedule.Preferred QualificationsPrior DHS suitability.Scripting experience with PowerShell and/or Shell scripting.Experience with VMware virtualization technologies.Experience with Microsoft SQL Server and PostgreSQL experience administering Active Directory and Group Policy.Experience with security vulnerability remediation and : The annual salary range for this position is $90,000–$100,000.