IT Systems Administrator

Sullivan Environmental Services Inc • Houston, TX

5d • Onsite

About The Position

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. The role shares responsibility for day-to-day security monitoring and response. As part of the parent-company infrastructure team, the position supports multiple affiliated companies and serves as an escalation point for the Help Desk. It combines senior-level work in design, security, and standards with hands-on administration and support, and reports directly to the IT Manager.

The administrator manages Microsoft 365 and Azure services, identity and access, endpoint management, cloud resources, SaaS platforms, on-premises systems, virtualization, networking, backups, and disaster recovery activities. The role also handles complex support escalations, assists with security alert monitoring and incident response, follows change-management practices, maintains IT assets and documentation, and trains users.

The position is onsite at the parent-company headquarters, with occasional travel to affiliated company locations a few times per year. Availability after hours is expected for urgent issues.

Requirements

• Bachelor’s degree in MIS, Computer Science, Computer Engineering, a related field, or equivalent experience.
• At least 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.
• 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, Fortinet, and Ubiquiti networking.
• Experience with PowerShell scripting and automation.
• Established customer-service skills and ability to explain technical issues to non-technical users.
• Strong troubleshooting, documentation, and prioritization skills, with the ability to work independently and as part of a small team.

Nice To Haves

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

Responsibilities

• Administer Microsoft 365 services, including Exchange Online, SharePoint, OneDrive, Teams, licensing, and tenant-level configuration and policies.
• Manage Microsoft Entra ID identity and access, including user lifecycle, groups, Conditional Access, MFA, role assignments, and hybrid identity with on-premises Active Directory.
• Manage Microsoft Intune device enrollment, compliance, configuration, application deployment, and patching for Windows and mobile devices.
• Deploy and manage Azure resources, including virtual machines, networking, storage, backup, and monitoring, with attention to cost, availability, and security.
• Automate routine administration and reporting using PowerShell and other scripting tools.
• Administer SaaS platforms such as Smartsheet and monday.com, including provisioning, permissions, integrations, single sign-on, and licensing.
• Work with business application owners and vendors on configuration changes, access requests, and issue resolution; evaluate SaaS tools for security and integration fit and assist with application rollouts.
• Manage on-premises Active Directory, Windows Server, and Hyper-V environments and maintain updates for server and desktop systems.
• Administer and troubleshoot Fortinet and Ubiquiti firewalls, switching, and wireless infrastructure, including VPN and remote access.
• Assist with managing VOIP and cellular phone systems.
• Maintain backups, monitor system performance and capacity, and participate in disaster recovery testing.
• Serve as Tier 2/3 escalation for the Help Desk and local IT staff at affiliated companies, owning complex or unresolved tickets through resolution.
• Monitor and respond to support tickets and emails in Zendesk, including after-hours response to urgent issues.
• Perform root-cause analysis on recurring issues, document fixes in the knowledge base, and coach Help Desk staff on resolution steps.
• Communicate issue status clearly to end users and stakeholders until resolution.
• Share responsibility for monitoring and responding to Microsoft Defender and Darktrace alerts; triage and investigate incidents and escalate or contain as needed.
• Help tune detections and policies and assist with vulnerability remediation, security baselines, and access reviews.
• Gather evidence and documentation for audits, assessments, and security questionnaires.
• Follow change-management practices for infrastructure and security changes, including communication and rollback planning.
• Maintain IT asset inventory, coordinate equipment ordering, prepare hardware for employee use, and ensure secure disposal of retired equipment.
• Maintain current network diagrams, runbooks, standard procedures, and configuration records.
• Train users in the proper use of hardware and software.
• Ensure systems and services are reliable and available, perform maintenance in agreed windows, and notify affected users in advance.
• Keep servers, network devices, Microsoft 365, and Intune policies patched and updated on a regular cadence; monitor backups and promptly address failures.
• Review assigned security alerts promptly and maintain accurate user access, onboarding, and offboarding processes.
• Perform other duties as assigned.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior