Salary: Depends on Qualifications
Location : Houston, TX
Job Type: Regular Full-time
Job Number: 16800
Department: Universal Services
Opening Date: 06/16/2026
Closing Date: 7/17/2026 11:59 PM Central
Max Number of Applicants: 100

Position Description
Position Overview:

Under general supervision, the Enterprise System Administrator is responsible for installing configuring and maintaining enterprise applications such as email, active directory, and other collaborative technologies in accordance with established IT policies and procedures. Requires a thorough understanding of Active Directory including forest and trust concepts. Works with latest Microsoft technologies including O365, Skype for Business, Exchange Online, federation services, and MDM platforms. Understands and can troubleshoot and diagnose DNS and hierarchical based systems. Works well in a team environment and communicates effectively with peers and customers.
The Enterprise System Administrator will work in a team environment overseeing Infrastructure Applications and Services, including:

• Installing, configuring, and maintaining enterprise applications and complex identity services, including multi-forest Active Directory environments, cross-forest trusts, child domains, GPOs, and Entra ID.
• Managing enterprise messaging, edge security, and collaboration platforms, specifically Cisco IronPort (Secure Email Gateway), Exchange Server Subscription Edition (SE) On-Premises, Exchange 365 / Exchange Online hybrid environments, and Microsoft Teams.
• Overseeing inbound and outbound mail flow security, including Cisco IronPort policy controls, content filters, blocklists, and messaging coexistence/synchronization across hybrid cloud and cross-domain boundaries.
• Automating system administration and infrastructure tasks across multiple domains using advanced scripting (e.g., PowerShell, Python) to streamline server deployment, bulk object lifecycle management, and metadata cleanup.
• Overseeing core infrastructure services (DNS, DHCP, PKI) and the lifecycle management of enterprise servers in a distributed network architecture.
• Designing, testing, and maintaining disaster recovery, backup solutions, and high-availability server clusters.
• Monitoring system performance and capacity needs for all supported applications, databases, and core collaboration/gateway infrastructure.
• Coordinating with customers and departmental users across different domains to troubleshoot complex mail flow and cross-boundary issues, providing high-level ticket support, and driving problem resolution.
• Maintaining server and application documentation.
• Collaborating with Cybersecurity, Desktop Endpoint, and compliance teams to ensure appropriate patch management, gateway security baselines, and cross-forest access-control alignment.
• Performing other duties as assigned by the department.

Requirements
Education:

• Bachelor's degree in an IT-related field plus 4 years of progressive enterprise systems administration experience

OR

• High School diploma/GED plus 8 years of progressive enterprise systems administration experience

Experience:

• Five (5) years of IT work experience supporting servers and software applications and problem solving/troubleshooting.
• Proven advanced experience supporting servers and enterprise applications (including O365, Exchange, and Active Directory) in a large enterprise, advanced experience supporting Microsoft productivity applications.

Knowledge, Skills & Abilities (KSAs):

• Exceptional technical troubleshooting skills.
• Advanced experience supporting PC operating system and hardware.
• Excellent interpersonal and written/oral communication skills.
• The ability to interact with staff at all levels, including VIPs.
• The ability to work independently with a high level of productivity and accuracy.
• Ability to work extended hours occasionally on special projects or emergency activations.
• MUST have exceptional customer service skills.
• Ability to identify and troubleshoot complicated issues.

Applicants for this position will be subject to a criminal background check that includes being fingerprinted. This applies to any position with network access to Criminal Justice Information Services (CJIS) or access to an area where CJIS is received, maintained or stored either manually or electronically (i.e. custodian, maintenance).

Automatic Disqualification:

• Convictions, probation, or deferred adjudication for any Felony, and any Class A Misdemeanor
• Convictions, probation, or deferred adjudication for a Class B Misdemeanor, if within the previous 10 years
• Open arrest for any criminal offense (Felony or Misdemeanor)
• Family Violence conviction

NOTE: Qualifying education, experience, knowledge and skills must be documented on your job application. You may attach a resume to the application as supporting documentation but ONLY information stated on the application will be used for consideration. "See Resume" will not be accepted for qualifications.

Preferences
Education:

• Advanced degree or certifications

Experience:

• Five (5) years of experience managing Active Directory and DNS systems.
• Knowledge of ITIL, change management, active directory and group policy concepts is a plus.

Knowledge, Skill & Abilities (KSAs):

• Certifications including Azure experience.

General Information
Work Schedule:

• Mon. - Fri., 40Hrs
• Hybrid Schedule: Minimum 2 Days In-Office (Non- Negotiable)
• May be required to work more than forty hours during the workweek and/or weekends or on-call 24 hours a day to meet special projects or deadlines
• Subject to performing other duties as assigned

Location:

• 406 Caroline St., Houston, Tx. 77002
• Must live or plan to live in the Houston Texas metropolitan area

Salary:

• Depends on Qualifications.
• Based on 26-Pay Periods
• Due to a high volume of applications positions may close prior to the advertised closing date.

Employment may be contingent on passing a drug screen and meeting other standards.

Due to a high volume of applications positions may close prior to the advertised closing date or at the discretion of the Hiring Department.

HARRIS COUNTY EMPLOYEE BENEFITS

Harris County offers a highly competitive benefits program, featuring a comprehensive group health plan and defined benefit retirement plan.
The following benefits are offered only to Harris County employees in regular (full-time) positions:
Health & Wellness Benefits

• Medical Coverage
• Dental Coverage
• Vision Coverage
• Wellness Plan
• Life Insurance
• Long-Term Disability (LTD) Insurance
• Employee Assistance Program (EAP)
• Healthcare Flexible Spending Account
• Dependent Care Flexible Spending Account

Paid Time Off (PTO)

• Ten (10) days of vacation leave per year (accrual rate increases after 5 years of service)
• Eleven (11) County-observed holidays
• One (1) floating holiday per year
• Paid Parental Leave*
• Sick Leave

Retirement Savings Benefit

• 457 Deferred Compensation Plan

The following benefits are available to Harris County employees in full-time and select part-time positions:

• Professional learning & development opportunities
• Retirement pension (TCDRS defined benefit plan)
• Flexible work schedule*
• METRO RideSponsor Program*

* Participation may vary by County department. The employee benefits plans of Harris County are extended to all eligible participants across various departments with the exception of the Harris County Community Supervision and Corrections Department, for which the cited Health & Wellness Benefits are administered through the State of Texas.
In accordance with the Harris County Personnel Regulations, group health and related benefits are subject to amendment or discontinuance at any time. Harris County Commissioners Court reserves the right to make benefit modifications on the County's behalf as needed.
For plan details, visit the Harris County Benefits & Wellness website:
01

Which of the following best describes your highest level of education completed as it relates to this position?Qualifying information must be documented in the Education section of your application.

• High School or GED diploma
• Associate Degree
• Bachelor's Degree
• Master's Degree or higher
• None of the above

02

If you selected a college degree in response to the previous question, which of the following best describes your major?

• Information Technology (IT) Related Field
• Other Related Field
• Unrelated Field
• N/A; No Degree

03

Please describe your educational background including level of education completed, area of study and completed major and minor programs.
04

Which of the following best describes your verifiable progressive enterprise systems administration experience?(To be considered, qualifying experience must be documented in your application's employment history)

• Less than four (4) years
• Four (4) years but less than six (6) years
• Six (6) years but less than eight (8) years
• Eight (8) years or more
• I do not have this experience

05

Please provide the dates of employment during which you obtained experience working in progressive enterprise systems administration. Provide the month and year that began and ended the experience ( Example: "January 2020 - December 2025" ) If this experience is not clearly documented in the Work Experience section, your application will be disqualified. If you do not have this experience, type "N/A" in the space provided.
06

Do you have five (5) years of IT work experience supporting servers and software applications and problem solving/troubleshooting?

• Yes
• No

07

Please provide the dates of employment during which you obtained experience working in IT supporting servers and software applications and problem solving/troubleshooting. Provide the month and year that began and ended the experience ( Example: "January 2020 - December 2025" ) If this experience is not clearly documented in the Work Experience section, your application will be disqualified. If you do not have this experience, type "N/A" in the space provided.
08

Do you have five (5) years of experience managing Active Directory and DNS systems?

• Yes
• No

Required Question