IT Systems Administrator

Sullivan Brothers Family of Companies; Houston (TX); On-site; USD 90,000 - 120,000; Full time

Job summary

Sullivan Brothers Family of Companies in Houston, TX is seeking an IT Systems Administrator to manage cloud, server and network infrastructure with emphasis on Microsoft 365 and Azure. You will support multiple affiliated companies and provide Tier 2/3 escalation for Help Desk.

The role requires hands-on administration of on‑premises and cloud environments, plus security monitoring and disaster recovery planning. This is an in‑office position with occasional travel to affiliates.

Qualifications

• Bachelor’s degree or equivalent experience in MIS/CS/CE or related field.
• 5+ years of systems administration experience including Microsoft 365 and Azure in a multi-user environment.
• Hands-on experience with Microsoft Entra ID, Intune and Exchange Online; familiarity with Defender XDR and Darktrace.
• Experience administering SaaS platforms such as Smartsheet and monday.com.
• Working knowledge of Active Directory, Windows Server, Hyper-V, Fortinet and Ubiquiti networks.
• Experience with PowerShell scripting and automation.
• Strong communication, troubleshooting and documentation skills.

Responsibilities

• Manage Microsoft 365 services, including Exchange Online, SharePoint, OneDrive, Teams and licensing.
• Handle Azure resources, cost control, security improvements and hybrid identity.
• Administer on‑premises infrastructure (AD, Windows Server, Hyper‑V) and network devices including Fortinet and Ubiquiti.
• Serve as Tier 2/3 escalation for Help Desk; monitor tickets and resolve complex issues.
• Assist with security monitoring using Defender and Darktrace; support vulnerability remediation.
• Document runbooks, diagrams and procedures; ensure change management and DR readiness.

Skills

Systems administration

Customer-service

Troubleshooting

Education

Bachelor’s Degree in MIS/CS/CE or equivalent

Tools

Microsoft Entra ID

Intune

Exchange Online

PowerShell

Microsoft Defender

Darktrace

Smartsheet

monday.com

Active Directory

Windows Server

Hyper-V

Fortinet

Ubiquiti

Job description

If you are unable to complete this application due to a disability, contact this employer to ask for an accommodation or an alternative application process.

IT Systems Administrator

830-IT Full Time Business Support Houston, TX, US

6 days ago Requisition ID: 2650

**THIS IS AN IN-OFFICE POSITION LOCATED IN HOUSTON, TX**

**NOT A REMOTE JOB**

The IT Systems Administrator monitors, secures, maintains and advances the Company’s cloud, server and network infrastructure, with a primary emphasis on Microsoft Azure and Microsoft 365, and shares responsibility for the Company’s day-to-day security monitoring and response. As a member of the parent-company infrastructure team, this position supports multiple affiliated companies and serves as the escalation point for the Help Desk. Because of the team’s size, the role blends senior-level responsibilities (design, security, standards) with hands‑on administration and support. This position reports directly to the IT Manager.

Key Roles and Responsibilities:

Microsoft 365 and Azure

• Administer Microsoft 365 services extensively, including Exchange Online, SharePoint, OneDrive, Teams, licensing, and tenant‑level configuration and policies.
• Manage Microsoft Entra ID (Azure AD) identity and access: user lifecycle, groups, Conditional Access, MFA, role assignments, and hybrid identity with on‑premises Active Directory.
• Manage Microsoft Intune for device enrollment, compliance, configuration, application deployment and patching (Windows and mobile).
• Deploy and manage Azure resources (virtual machines, networking, storage, backup, monitoring) with attention to cost, availability and security.
• Automate routine administration and reporting with PowerShell and other scripting tools.

SaaS Platform Administration

• Administer and support SaaS platforms such as Smartsheet and monday.com, including user provisioning, permissions, integrations, single sign‑on, and licensing.
• Partner with business application owners and vendors on configuration changes, access requests, and issue resolution.
• Evaluate new SaaS tools for security and integration fit, and assist with roll‑out of new applications.

On-Premises, Hyper‑V and Network Infrastructure

• Manage on‑premises environments, including Active Directory, Windows Server and Hyper‑V, and maintain updates for all server and desktop systems.
• Administer and troubleshoot firewalls, switching and wireless (Fortinet, Ubiquiti), including VPN and remote access.
• Assist with managing VOIP and cellular phone systems.
• Maintain backups, monitor system performance and capacity, and take part in disaster recovery testing.

Help Desk Escalation

• Serve as Tier 2/3 escalation for the Help Desk and for local IT staff at the affiliated companies; take ownership of complex or unresolved tickets through resolution.
• Proactively monitor and respond to support tickets and e‑mails in the ticketing systems (Zendesk), including after‑hours for urgent issues.
• Perform root‑cause analysis on recurring issues, document fixes in the knowledge base, and coach Help Desk staff on resolution steps.
• Communicate status clearly to end users and stakeholders, in plain language, until issues are closed.

Security Support

• Share responsibility with the IT Manager and team for monitoring and responding to alerts in Microsoft Defender and Darktrace; triage and investigate incidents, and elevate or contain as needed.
• Help tune detections and policies, and assist with vulnerability remediation, security baselines and access reviews to support the Company’s cyber security posture with an ITSM approach.
• Gather evidence and documentation to support audits, assessments and security questionnaires.

Operations and Documentation

• Follow change management practices for infrastructure and security changes, including communication and rollback planning.
• Maintain IT asset inventory, coordinate ordering of IT equipment, set up hardware for employee use, and ensure secure disposal of retired equipment.
• Maintain accurate documentation: network diagrams, runbooks, standard procedures and configuration records.
• Train users in the proper use of hardware and software.
• Other duties as assigned.
• Systems and services are reliable and available, with maintenance done in agreed windows and affected users notified in advance.
• Servers, network devices, and Microsoft 365 and Intune policies are patched and updated on a regular cadence.
• Backups are monitored and failures are addressed promptly.
• Escalated issues are owned through resolution, with status updates to the Help Desk and end users.
• Changes follow change management, including communication and a rollback plan.
• Assigned security alerts are reviewed and acted on promptly.
• User access, onboarding and offboarding are accurate and reviewed regularly.
• Documentation is kept current as changes are made.
• Available after-hours for urgent issues.

Working Conditions:

• Onsite at the parent-company headquarters.
• Occasional travel to affiliated company locations (a few times per year).

Job Qualifications (skills, knowledge & abilities):

• Bachelor’s Degree in MIS, Computer Science, Computer Engineering, related field, or equivalent experience.
• 5+ years of experience in systems administration, including Microsoft 365 and Azure in a multi‑user environment.
• Hands‑on experience with Microsoft Entra ID, Intune and Exchange Online; working familiarity with Microsoft Defender XDR and Darktrace (or comparable security monitoring tools).
• Experience administering SaaS platforms such as Smartsheet and monday.com.
• Working knowledge of Active Directory, Windows Server, Hyper‑V, and Fortinet, and Ubiquiti networking.
• Experience with PowerShell scripting and automation.
• Established customer‑service skills and the ability to explain technical issues to non‑technical users.
• Strong troubleshooting, documentation and prioritization skills; able to work independently and as part of a small team.

Preferred Certifications

• Microsoft: MS-102 (Microsoft 365 Administrator), AZ-104 (Azure Administrator), SC-300 (Identity and Access Administrator), or MD-102 (Endpoint Administrator).
• CompTIA Security+ or Network+, or equivalent.