Windows & Linux Telephony Systems Administrator

Arena Technical Resources, LLC (ATR); Maryland; On-site; USD 95,000 - 125,000; Full time

Job summary

Arena Technical Resources, LLC (ATR) seeks a Windows/Linux System Administrator to manage and support internal telephony systems for Homeland Security, with strong emphasis on security, reliability, and cross-system integrations. The role requires active Secret clearance and US citizenship due to contract requirements.

The candidate will handle installation, configuration, monitoring, and maintenance of Windows and Linux servers, virtualization, and telephony platforms, while coordinating with

Qualifications

• Active Secret security clearance.
• US citizenship required by contract; dual citizenship not eligible.
• 7+ years of systems administration/engineering experience.
• Experience with Windows and Linux server environments, including patching and troubleshooting.
• Experience with telephony platforms (Avaya) and call recording/workforce management.
• VMware ESXi and vCenter administration for installs, upgrades, and certificates.
• Networking experience including IPv4/IPv6 and monitoring.
• Active Directory and Group Policy administration experience.
• Ability to reside within commutable distance for daily onsite work and on-call recall.

Responsibilities

• Manage and support enterprise telephony systems across programs and platforms.
• Install, configure, operate, monitor, and maintain enterprise infrastructure (web servers, app servers, telecom hardware).
• Install, configure, troubleshoot telephony systems, Windows/Linux servers, and network integrations with AD/DNS/DHCP/LDAP.
• Collaborate with cross-functional teams to ensure high availability and security.
• Apply regular and emergency patches to Windows/Linux servers.
• Plan, test, and execute system upgrades and migrations.
• Conduct regular health checks and preventive maintenance.
• Coordinate with security teams to address audit findings and remediations.
• Perform other tasks as assigned.

Skills

Windows Server

Linux Server

VMware ESXi

vCenter

Active Directory

Group Policy

Networking IPv4/IPv6

Security patching

Scripting PowerShell

On-call rotation

IIS

Telephony platforms

Audit remediation

Education

Bachelor's degree or equivalent experience

Tools

Dell PowerEdge servers

Anaya J Series phones

DNS

DHCP

LDAP

Job description

Arena Technical Resources, LLC (ATR) seeks a Windows/Linux System Administrator to manage and support internal telephony systems for Homeland Security, with strong emphasis on security, reliability, and cross-system integrations. The role requires active Secret clearance and US citizenship due to contract requirements.

The candidate will handle installation, configuration, monitoring, and maintenance of Windows and Linux servers, virtualization, and telephony platforms, while coordinating with