Windows / Linux System Administrator

Mount Indie; Maryland; On-site; USD 90,000 - 100,000; Full time

Job summary

Mount Indie is seeking a Windows/Linux Systems Administrator to support internal enterprise telephony systems for a Homeland Security mission. The role requires hands-on administration across Windows and Linux servers, virtualization, networking, and security to ensure 24x7x365 availability onsite in Annapolis Junction, MD.

You will manage telephony environments, including WFO/WFM, CMS, call recording platforms, and Avaya/J Series phones, while coordinating with security teams to address audit

Qualifications

• 7+ years of relevant experience in systems administration or systems engineering.
• Experience administering Windows and Linux Server environments.

Responsibilities

• Manage and support enterprise telephony environments and related platforms.
• Install, configure, operate, monitor, and maintain enterprise infrastructure including servers and telecom hardware.
• Troubleshoot telephony platforms, Windows and Linux servers, and network connectivity.

Skills

Windows Server

Linux Server

VMware ESXi

Active Directory

Networking

Security patching

Tools

IIS

Dell PowerEdge

Avaya J Series

vCenter

PowerShell

Job description

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

The Opportunity

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.

What You’ll Do

• 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 PowerEdge 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.

What You’ll Bring

• 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.

Preferred Qualifications

• Prior DHS suitability.
• Scripting experience with PowerShell 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.

Compensation

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