Sr. Systems Administrator

Arena Technical Resources, LLC (ATR); Manassas (VA); On-site; USD 110,000 - 160,000; Full time

Job summary

Arena Technical Resources, LLC (ATR) is seeking a Sr. Systems Administrator in Manassas, VA to manage Windows servers, AD, GPOs, and cloud workloads. The role emphasizes security, vulnerability assessment, and compliant configurations across on‑prem and Azure environments.

Responsibilities include maintaining OS baselines, implementing security controls, supporting staff, and ensuring disaster recovery readiness. A 10+ year track record and strong collaboration skills are essential for success.

Qualifications

• Bachelor's degree or related field required; Security+ or equivalent certification preferred.
• Ten+ years of relevant Windows server, AD, GPO, and networking experience.
• Familiarity with CIS/NIST controls and zero-trust concepts preferred.
• Azure cloud and Office 365 experience is required or strongly preferred.

Responsibilities

• Maintain and secure Windows Server and workstation baselines.
• Configure, monitor, troubleshoot, and patch Windows OS and related infrastructure.
• Implement and manage AD, GPOs, and security settings.
• Develop and maintain disaster recovery and replication plans.
• Provide support to technical staff and triage complex system issues.
• Assist in vulnerability assessments and remediation efforts.
• Implement and manage endpoint security and zero-trust initiatives.

Skills

Ten+ years Windows System Admin

Security mindset

Team player

Education

Bachelor's degree in CS/MIS or related field

Security+

MSA

MCSE

Azure certifications (AZ-900, AZ-104)

Tools

Active Directory

Group Policy Objects

Windows Server (2016/2019/2022)

Office365/Office apps

Azure/Azure AD

EDR endpoint security tools

PowerShell scripting

File Clusters/Print Servers

virtualization technologies

Job description

Job Title: Sr. Systems Administrator
Job Location: Manassas, VA
Eligibility/Clearance: US Citizen or Green Card Holder

JOB DESCRIPTION
We are seeking a skilled and experienced System Administrator to join
our team. The ideal candidate will manage and maintain our Microsoft
Windows systems, endpoint security, and cloud infrastructure. Here are
the key requirements and responsibilities for this role:

Technical Skills:

• Proficient in managing and maintaining Active Directory, including creating and managing security groups.
• Experienced in implementing and troubleshooting Group Policy Objects for efficient system configuration.
• Proficient in managing Windows Server Infrastructure (2016/2019/2022).
• Experience with Microsoft Office, Office365, Active Directory, File Clusters, and Print Servers.

Vulnerability Assessment and Security Frameworks:

• Thorough knowledge of conducting vulnerability assessments to identify and mitigate potential security risks.
• Familiar with security frameworks such as CIS and NIST guidelines, ensuring compliance with industry standards.
• Previous knowledge of implementation of Zero-Trust architecture.
• Implement and administrate endpoint security tools, including EDR solutions.

Cloud Services:

• Solid understanding and practical experience in utilizing Azure services for cloud-based solutions.
• Proficient in deploying and managing resources on the Azure platform.

Virtualization:

• Skilled in virtualization technologies, including setup, configuration, and maintenance of virtual environments.
• Extensive experience in optimizing virtual resources to enhance overall system performance.

Asset Management:

• Well-versed in asset management practices, including tracking, inventory, and lifecycle management of IT assets.
• Skilled in implementing efficient asset management systems for improved organizational efficiency.

Scripting and Automation:

• Experience interpreting, writing, and debugging PowerShell scripts for automation.

Responsibilities:

System Maintenance:

• Maintain Operating System baselines for Windows Servers and Workstations.
• Implement, install, configure, monitor, troubleshoot, and evaluate Microsoft Windows operating systems.

Enhancements and Recommendations:

• Recommend and implement system enhancements to improve performance and reliability.
• Install, upgrade/patch, monitor, troubleshoot, and perform configuration management.

Security Implementation:

• Implement hardened settings to improve the security posture of endpoints.
• Restrict the use of local admin accounts and implement the least privilege principle.

Support and Diagnostics:

• Provide support to technical staff in diagnosing and correcting system related failures.
• Determine logical solutions to complex system administration and application problems.

Disaster Recovery and Replication:

• Implement and manage disaster recovery strategies.
• Configure and maintain replication processes for critical systems.

Academic QUALIFICATIONS

• Bachelor's (BS) degree in computer science, management information systems, or a related field.
• Certification in a related field (Security +, MSA, MCSE) would be considered a plus.
• Microsoft Azure certification (AZ-900, AZ104) will be considered a plus.

DESIRED SKILLS

• Good communication skills and a strong work ethic.
• Work as an adaptable team player.
• Working knowledge of CIS controls.
• General knowledge of Cloud technologies, such as Office 365

Minimum Experience

• 10 years of relevant experience with Microsoft Windows server operating systems, Active Directory, Group Policies, Cyber Security, and TCP/IP networking

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 disability.