Senior Systems Administrator (Microsoft Exchange)

Arlington County requires all applicants to thoroughly complete each section of the application, including prior job responsibilities, duties, and supplemental questions. While you may attach a resume, it will not replace a completed application. Incomplete applications will not be considered.

Arlington County's Department of Technology Services (DTS) is hiring an experienced Senior Systems Administrator (Microsoft Exchange) to provide high-level work as part of the Hosting and Infrastructure team. The Hosting and Infrastructure team is responsible for the administration and operational reliability of the County’s enterprise infrastructure, including server environments, Active Directory, and Microsoft Office 365 services. The Senior Systems Administrator (Microsoft Exchange) will serve as the senior technical resource for the County’s email and messaging environment, supporting a Microsoft Exchange and Azure-based platform used across all departments. The role is responsible for ensuring system availability, security, and performance and functions as the lead administrator for this service area.  

The ideal candidate will have proven experience performing advanced systems administration work, including managing Exchange environments, administering mailboxes and identity services, implementing security controls (e.g., SPF, DKIM, DMARC), monitoring system performance, and resolving complex mail flow and authentication issues. 

Specific duties include:

• Administer and maintain the County’s Microsoft Exchange and Office 365 email infrastructure, including server performance, security settings, and system monitoring;
• Manage user mailboxes, distribution lists, and access permissions while ensuring adherence to County policies and regulatory requirements;
• Configure and support email security measures and threat‑protection tools, including spam filtering, encryption, and authentication standards;

• Ability to diagnose and resolve mail flow issues, synchronization problems, and system performance concerns;

• Troubleshoot complex issues related to email delivery, synchronization, and system integrations;
• Support hybrid cloud operations, including Azure Active Directory synchronization and identity management;
• Develop and maintain technical documentation, operational procedures, and system standards; and 
• Automate administrative tasks using scripting and reporting tools, and collaborate with network, security, and application teams to ensure reliable and secure email service delivery.

Minimums:  

• Bachelor’s degree in Computer Science, Information Systems Management, or a related field; and

• Considerable experience directly related to managing and implementing information systems, operating systems, Storage Area Networks (SAN), systems analysis, and networking. 

Licenses/Certifications: Microsoft Certified: Administrator Expert (MS-102) is preferred.

Substitution: Additional qualifying experience may substitute for the education requirement on a year-for-year basis.

Working Conditions: 

• The employee must be available to work after hours and in emergency situations.

   

Desirables: Preference may be given to candidates with experience in one or more of the following:

• Hands‑on experience with Exchange and Office 365 administration, along with strong skills in Active Directory, Windows Server, PowerShell automation, and messaging/security management;

• Email security tools, threat protection, and compliance features;

• Virtualization platforms (VMware, Hyper‑V) supporting Exchange environments; and/or

• Implementing retention policies, litigation hold, eDiscovery, and compliance center features.

Special Requirements

Please note: A complete application includes an attached resume. 

A pre-employment criminal records background check will be conducted. It may include checks of the following: criminal record, driving record, education, professional licensure, and credit history. You may be required to sign a release authorizing the County to obtain your background information.

A complete application with ALL relative work history responsibilities (not just the current employer) is required to be considered for this position. Your responses to the supplemental questionnaire are considered part of the selection process and are required for this position. Please do not give "see resume" as a response to the questions. Incomplete applications will not be considered. 

Additional Information

Work hours: This is a 40-hour per week position, Monday-Friday 8:00 a.m. - 5:00 p.m. with some flexibility.  

Occasional evenings, nights and weekends may be required. 
 
Remote work (telework) is available for this position with prior supervisor approval.

The selection process may include both virtual and in-person interviews.

Location: 2100 Clarendon Blvd, Suite 700, Arlington, VA 22201.

The official title for this position is: Senior Systems Administrator

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