Description Why join GBRA? · Competitive salary · Medical, Dental, Vision, and Life Insurance at no cost to employee · Texas County & District Retirement system matched 2:1 at retirement · Vacation and sick leave · Paid Holidays · 100% company-paid training · License incentive program · Educational assistance program · Safety boot program · Employee wellness program with gym reimbursement · Employee recognition events · Exclusive employee perks & discounts
FLSA STATUS: Exempt
PAY RANGE: $74,121.00 - $123,534.00
REPORTS TO: IT Operations Manager
WORK LOCATION: 2225 E. Common Street, New Braunfels, Texas 78130.
SUMMARY:
The Senior System Administrator manages GBRA's on-premises data center and cloud infrastructure, including servers, virtualization, storage, core services, hybrid identity, Azure, and Microsoft 365. The position maintains secure, reliable, and recoverable operations and independently determines technical methods to complete work within management-established priorities.
ESSENTIAL DUTIES AND RESPONSIBILITIES:
ON-PREMISES INFRASTRUCTURE & DATA CENTER SYSTEMS
- Administer physical and virtual servers, Windows Server, virtualization platforms, storage, and related data center infrastructure throughout their lifecycle, including provisioning, upgrades, migrations, and retirement.
- Maintain core services including Active Directory Domain Services, Group Policy, file and print services, certificates, and service accounts.
- Coordinate data center installation, cabling, power, cooling, firmware, and warranty support; troubleshoot host connectivity, virtual switching, VLANs, and firewall dependencies.
AZURE, MICROSOFT 365 & CLOUD SERVICES
- Administer Azure infrastructure, including virtual machines, storage, resource groups, Application Gateway, backups, monitoring, networking, and hybrid connectivity; implement infrastructure integrations, migrations, and modernization.
- Manage Azure subscriptions, role-based access, resource governance, usage, budgets, and cost optimization.
- Administer Microsoft 365 tenant health, core service configuration, and infrastructure dependencies for Exchange Online, Teams, OneDrive, and SharePoint Online.
HYBRID IDENTITY, ACCESS & AUTOMATION
- Administer hybrid identity across Active Directory and Microsoft Entra ID, including synchronization, authentication, groups, service identities, application registrations, SSO, MFA, Conditional Access, and administrative roles.
- Monitor sign-in activity and identity risks; investigate authentication, access, and identity protection alerts and implement remediation.
- Develop and maintain identity and infrastructure automation using Adaxes, PowerShell, Microsoft Graph, and scheduled tools, including provisioning, offboarding, group changes, and delegated administration.
SYSTEM RELIABILITY, SECURITY & RECOVERY
- Monitor server, storage, virtualization, and cloud service health; investigate alerts and troubleshoot complex performance and availability issues.
- Maintain system patching, configuration baselines, security hardening, vulnerability remediation, privileged access controls, and audit logging.
- Administer backups, replication, high availability, and recovery capabilities; regularly test restores and disaster recovery procedures.
- Support enterprise application infrastructure, including Windows services, SQL Server, certificates, file shares, and integrations; implement approved changes with testing and rollback plans.
PLANNING, DOCUMENTATION & COLLABORATION
- Maintain infrastructure inventories, architecture diagrams, configurations, service dependencies, operating procedures, and recovery documentation.
- Assess capacity, performance, technology lifecycles, and business requirements; recommend infrastructure improvements, standardization, upgrades, and retirement.
- Coordinate infrastructure implementations, maintenance, and vendor escalations; serve as the escalation point for complex infrastructure incidents and service requests.
- Perform other duties as assigned.
Requirements
KNOWLEDGE, SKILLS/ABILITIES:
- Strong knowledge of Windows Server, Active Directory, virtualization, enterprise storage, data center infrastructure, and core network services.
- Proficiency with Azure, Microsoft 365 applications, Entra ID, hybrid identity, and associated access and security controls.
- Knowledge of server and cloud networking, system monitoring, patching, hardening, high availability, backup and recovery, and infrastructure lifecycle management.
- Experience with PowerShell and identity/infrastructure automation; familiarity with Adaxes, Microsoft Graph, and Azure automation tools preferred.
- Ability to troubleshoot complex systems, select technical approaches independently, and manage assignments according to established priorities.
- Strong documentation, communication, customer service, and collaboration skills.
EDUCATION/CERTIFICATIONS:
Education:
- Associate's Degree in Information Technology, Computer Science, Information Systems, or a related field preferred. Qualifying experience may substitute for formal education.
Certifications/Licenses:
- Relevant Microsoft Azure, Microsoft 365, Windows Server, or virtualization certifications preferred.
- Valid Class "C" Texas Driver's License with acceptable M.V.R.
EXPERIENCE:
Minimum of five years of increasingly responsible experience administering enterprise servers, virtualization, storage, Microsoft cloud services, or comparable hybrid infrastructure environments.
MANAGERIAL RESPONSIBILITIES
None.
PHYSICAL DEMANDS
The physical demands described here are representative of those required of an employee to successfully perform the essential functions of this job. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions. Standard physical activity, including sitting, standing, walking, and use of standard computer equipment.
WORK ENVIRONMENT
The work environment characteristics described here are representative of those an employee encounters while performing the essential functions of this job. Work is performed in a combination of office, field, and industrial environments across GBRA's 10-county service area and may involve heat, cold, humidity, dust, and noise. Occasional travel and work outside standard business hours may be required to support projects, outages, commissioning, maintenance windows, conferences, or training.
