Performance Windows Jobs in Helotes, TX (NOW HIRING)

About the Role

We’re looking for a System Administrator who enjoys solving complex problems, strengthening infrastructure, and keeping missioncritical systems running at peak performance. In this role, you’ll work with minimal supervision to provision, configure, maintain, and continuously improve our IT environment while ensuring reliability, security, and scalability.

You’ll play a handson role across Windows, Microsoft 365, virtualization, and Linux systems, collaborating closely with IT teammates and business partners. If you’re proactive, technically curious, and driven by best practices, this is an opportunity to make a meaningful impact.

What You’ll Do

• Ensure maximum availability, performance, and stability of systems, infrastructure, and applications using proactive monitoring
• Provide Tier 2/3 support for escalated and unresolved issues
• Perform root cause analysis and partner with incident response teams to implement corrective actions
• Maintain thorough documentation and ensure complete followthrough on projects
• Advise on and implement efficiency and performance improvements
• Manage and test backup, disaster recovery, and business continuity plans
• Respond to data loss incidents and restore systems as needed
• Collaborate with Network Administrators, System Administrators, and other IT staff on system design and implementation
• Provide guidance and technical support to internal departments
• Configure, maintain, and troubleshoot:
• Windows Server Failover Clusters
• Microsoft 365 (Azure, Intune, Exchange Online, Teams)
• Broadcom (VMware) vSphere environments (vCenter, ESXi, vSAN)
• Omnissa Horizon environments
• SQL operations and performance
• Participate in oncall rotation, including after hours and weekends
• Perform other duties as assigned

Required Qualifications

• Intermediate expertise in Windows Server administration, including:
• Active Directory & Group Policy
• SMB shares and NTFS permissions
• Windows Server Failover Clusters
• Intermediate expertise with Microsoft 365, including Azure, Intune, Exchange Online, and Teams
• Intermediate experience with Broadcom (VMware) technologies (vCenter, ESXi, vSAN)
• Intermediate experience with Omnissa Horizon administration
• Intermediate expertise in Linux server administration, including:
• Package management
• LVM/block device management
• SELinux
• Solid understanding of backup concepts, including incremental/reverse incremental chains and GFS backups
• Familiarity with:
• SCCM and patch management
• Windows imaging and WIM file maintenance
• macOS administration
• Networking concepts (ARP, DHCP, DNS, subnetting)
• SQL administration
• Ability to explain technical solutions to nontechnical stakeholders in a professional, approachable manner

Preferred Qualifications

• Strong desire to learn, grow, and take on new challenges
• Detailoriented mindset with a commitment to best practices
• Intermediate PowerShell scripting skills
• Relevant certifications, such as:
• Microsoft Certified: Windows Server Hybrid Administrator Associate
• Microsoft Certified: Azure Fundamentals (or higher)
• Microsoft 365 Certified: Fundamentals (or higher)
• Omnissa Certified Administrator – Horizon (or higher)
• Bachelor’s degree in Information Technology or a related field, or at least 2 years of consecutive experience in a related role

Work Environment & Additional Information

• Oncall support and flexible hours may be required, including early mornings, late nights, and weekends
• Occasional overtime may be necessary
• Ability to lift and move equipment up to approximately 40 lbs.
• Occasional travel to financial centers may be required

Building tomorrow starts with you!

At Firstmark Credit Union, we’re working together with our members to build their tomorrow — and we do the same for our employees. From your first day, you’ll enjoy comprehensive medical, dental, and vision coverage, a dollar for dollar 401(k) match, and up to four weeks of paid time off to rest and recharge. We invest in your growth through education assistance, support your well-being with our Employee Assistance Program, and encourage you to make a difference with paid and unpaid volunteer opportunities.

Here, you’ll find more than a career — you’ll find purpose, belonging, and a community that cares.