Senior Systems Administrator: Azure & Security Focus

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

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.