Windows / Linux System 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

Job Title: Windows / Linux System Administrator
Job Location: Annapolis Junction, MD
Eligibility/Clearance: Active Secret

Job Description: Seeking a Windows / Linux System Administrator to
manage and support internal-use telephony systems for our Homeland
Security customer. This role provides technical leadership for the
configuration, maintenance, and troubleshooting of enterprise telephony
infrastructure, with responsibilities spanning operating systems,
networking, security, and application support.

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

Arena Technical Resources, LLC, (ATR) is an Equal Opportunity Employer
(EOE) who will provide equal employment opportunity to employees and
applicants for employment without regard to race, ethnicity, religion,
color, sex, pregnancy, national origin, age, veteran status, ancestry,
sexual orientation, gender identity or expression, marital status,
family structure, genetic information, or mental or physical disability.