Windows​/Linux System Administrator

Windows / Linux Systems Administrator - Telephony Infrastructure

Location: Annapolis Junction, MD

Schedule: Full-time | Onsite

Clearance: Active Secret clearance required

Salary Range: $90,000-$100,000 annually

We 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
.

• Manage and support enterprise telephony environments, including hardware, software, peripherals, and applications such as WFO/WFM, CMS, and call recording platforms
  .
• Install, configure, operate, monitor, and maintain enterprise infrastructure, including IIS web servers, application servers, telecom hardware, Dell Power Edge servers, and Avaya J Series phones
  .
• Troubleshoot and resolve issues involving telephony platforms, Windows and Linux servers, network connectivity, and system integrations
  .
• Support 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 migrations.
• Conduct system health checks and preventive maintenance.
• Coordinate with security teams to address audit findings and implement appropriate remediation.
• Perform other assigned responsibilities as needed.

• An 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 applications
  .
• Experience 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 Administration
  .
• Ability 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
  .

• Prior DHS suitability
  .
• Scripting experience with Power Shell and/or Shell scripting
  .
• Experience with VMware virtualization technologies
  .
• Experience with Microsoft SQL Server and PostgreSQL databases.
• Demonstrated experience administering Active Directory and Group Policy
  .
• Experience with security vulnerability remediation and validation
  .

The annual salary range for this position is $90,000-$100,000
.