Windows / Linux System Administrator

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.