Senior System Administrator

GalaxEsystems; San Antonio (TX); On-site; USD 70,000 - 90,000; Full time

Job summary

GalaxEsystems is seeking a System Administrator II to join our on-site IT team in the Northwest San Antonio area. The role focuses on maintaining high availability, security, and performance of servers and networks across multiple office sites in San Antonio, Dallas, and Houston.

The ideal candidate will have 5+ years of experience, strong Windows Server and virtualization expertise, Azure/Intune familiarity, scripting skills, and a proactive approach to incident response and documentation.

Qualifications

• 5+ years of experience as a System Administrator or in a similar role.
• Bachelor’s degree in Computer Science, Information Technology, or related field (or equivalent experience).
• Proficiency with Windows Server (2016/2019/2022) and Windows Desktop (10/11); MacOS and Linux (Ubuntu) a plus.

Responsibilities

• Install, configure, and maintain desktop OSes, servers, and virtual environments (VMware).
• Manage networks hardware such as routers, switches, firewalls, and VoIP support.
• Design, deploy, and support Azure environments; monitor system performance.
• Monitor systems, analyze logs, and tune performance to prevent downtime.
• Ensure security through access controls, AD/Azure AD, antivirus, and patching.

Skills

Windows Server

Windows Desktop

MacOS/Linux

VMware vSphere/ESXi

Azure

PowerShell

Bash

Python

Networking

Troubleshooting

VoIP

Education

Bachelor’s degree in Computer Science/IT or related field

Tools

VMware vSphere/ESXi

Azure

Active Directory

Job description

Job Description: System Administrator II

Location: Northwest San Antonio, TX 78257

Job Type: Full Time, On-Site Position

Experience Level: Mid-Level

Job Summary

We are seeking a skilled and proactive System Administrator II to aid in the management, maintenance, and upgrade of our organization’s IT infrastructure. We support three office sites in San Antonio, Dallas, and Houston. The ideal candidate will be responsible for ensuring high availability, performance, and security of our servers, networks, and systems. Good interpersonal communication skills are essential as the candidate will work with end users as well as peers and management. You will play a crucial role in preventing downtime, implementing security protocols, best practices policies, and providing technical and operational support, ensuring day‑to‑day operations run smoothly.

Key Responsibilities and Duties

• Infrastructure Management: Install, configure, and maintain desktop operating systems (Windows/Apple), servers, virtual environments (VMware) and have working knowledge of network hardware (routers, switches, firewalls, wireless). Setup and support of VoIP (Spectrum) users and phones. Experience with Palo Alto, Juniper, Dell, and Cisco a plus.
• Azure/EntraID/Microsoft 365/Intune: Have strong experience with Azure infrastructure, support and troubleshooting. Will assist in designing, deploying, and support of Azure environments to support applications and infrastructure.
• Docker/Container Experience: Have working knowledge of containerization technologies to assist in support, developing applications strategies.
• System Monitoring & Performance: Proactively monitor system performance (PRTG, Azure), analyze logs, and implement performance tuning to optimize efficiency. Ability to respond right away to critical alerts and communicate effectively.
• Security & Data Protection: Ensure system security through access controls, user account management (Active Directory/Azure AD), antivirus (Sophos) protection, and patching. Follows best practices guidelines and assists to maintain SOC and other regulatory compliance.
• Backup & Recovery: Assist in monitoring regular data backups and maintain, test, and execute disaster recovery plans to ensure business continuity. Veeam experience preferred.
• Troubleshooting: Diagnose and resolve hardware, software, and network issues promptly to minimize downtime.
• Automation & Scripting: Develop/understand scripts (e.g., PowerShell, Bash, Python) to automate routine tasks and improve efficiency.
• Documentation: Maintain/Develop comprehensive technical documentation, including network diagrams, SOPs, and system configurations.
• Collaboration & Support: Collaborate with internal IT peers to implement new technologies and provide high‑level support for end‑users.

Required Qualifications & Skills

• Experience: 5+ years of experience as a System Administrator, Network Administrator, or similar role.
• Education: Bachelor’s degree in Computer Science, Information Technology, or a related field (or equivalent experience).
• OS Knowledge: Proficiency in Windows Server (2016/2019/2022), Windows Desktop (10/11). MacOS and Linux (Ubuntu) environments a plus.
• Networking: Strong understanding of networking concepts (TCP/IP, DNS, DHCP, VLANs, VPNs, VoIP).
• Virtualization/Cloud: Experience with virtualization technologies (VMware vSphere/ESXi) and cloud platforms (Azure).
• Scripting: Proficiency in scripting languages (PowerShell, Bash, or Python) for automation.
• Soft Skills: Strong analytical, problem‑solving, and troubleshooting skills, with the ability to work independently or as part of a team.
• Communication: Excellent verbal and written communication skills.

Desired Certifications (Preferred)

• Microsoft Certified: Azure Administrator Associate or MCSE
• CompTIA Network+ or Security+
• VMware Certified Professional (VCP)

Working Conditions

• May require occasional after‑hours/weekend support to address critical system emergencies or schedule maintenance.
• Some travel might be required to remote offices.
• Ability to lift/transport server equipment (up to 40 lbs).