Enterprise System Administrator

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.

• Installing, configuring, and maintaining enterprise applications and complex identity services, including multi-forest Active Directory environments, cross-forest trusts, child domains, GPOs, and Entra .
• Managing enterprise messaging, edge security, and collaboration platforms, specifically Cisco Iron Port (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 Iron Port policy controls, content filters, block lists, 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., Power Shell, 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.

• Bachelor’s degree in an IT-related field plus 4 years of progressive enterprise systems administration experience
• High School diploma/GED plus 8 years of progressive enterprise systems administration 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.

• 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.

• Mon.
  
  - Fri., 40
  
  Hrs
• 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

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

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

Harris County is an Equal Opportunity Employer. (Use the "Apply for this Job" box below). Employment Opportunity Plan .aspx. If you need special services or accommodations, please call  or email

This position is subject to a criminal history check. Only relevant convictions will be considered and, even when considered, may not automatically disqualify the candidate.

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.