Senior Systems Administrator

Jobtailor

Arlington (TX)

On-site

USD 90,000 - 130,000

Full time

3 days ago

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Job summary

Jobtailor in Arlington, Texas, seeks a senior IT Infrastructure Engineer to design, implement, and maintain core enterprise services across virtualization, cloud, identity, and collaboration platforms.

You will lead technical initiatives, optimize for high availability and disaster recovery, manage Active Directory and server/DB environments, and provide Tier-3 support in a 24x7 on-call rotation.

Qualifications

Bachelor's degree or equivalent experience in a computer-related field.
Minimum 5 years designing and operating enterprise IT infrastructure.
Experience with Windows/Linux server environments and cloud services.

Responsibilities

Design, implement, and maintain core infrastructure services.
Provide technical leadership across virtualization, AI, identity, cloud, and collaboration.
Administer and monitor operating systems, applications, and services.
Ensure SLAs with redundancy, high availability, and DR planning.
Troubleshoot complex problems and design robust resolutions.
Lead planning and support of computer systems, networks, and cloud platforms.
Support business initiatives through system design and planning.
Champion digital transformation including AI and hybrid cloud adoption.
Manage IT projects with independent planning and reporting.
Operate Help Desk ticketing for incident management and user interactions.
Create and maintain runbooks, SOPs, and architecture diagrams.
Maintain downtime and disaster recovery reports.
Contribute to cross-training and growth opportunities for junior staff.
Manage Active Directory, Group Policies, users, and computers.
Provide Tier-3 escalation and coordinate emergency responses.
Interface with end users and other departments to resolve IT issues.
Participate in on-call rotation for production support and change management.
Provide continuous monitoring of on-prem, remote, and cloud infrastructure.

Skills

Virtualization Platforms Management

Cloud Environment Implementation

Active Directory Administration

Disaster Recovery Planning

Technical Leadership

Education

Bachelor’s degree in Computer Science or related field

AA degree with 6+ years of related experience

Tools

VMware

Hyper-V

Azure

PRTG

SolarWinds

Nagios

IIS

Apache

Exchange Online

Office 365 Admin

Job description

Design, implement, and maintain core infrastructure services critical to enterprise operations
Provide technical leadership across virtualization platforms, artificial intelligence, identity systems, cloud environments, and enterprise collaboration services
Administer, maintain, monitor, report on, and support operating systems, applications, and services
Apply best practices for SLAs, redundancy, high availability, and disaster recovery
Analyze problems routinely, troubleshoot complex issues, and design resolutions for systems and applications
Lead the design, planning, installation, and support of computer systems, network hardware, software applications, cloud platforms, and peripherals
Support business-driven initiatives through planning and system design
Champion business and digital transformation, including AI, identity federation, and hybrid cloud adoption
Exercise independent judgment in planning, scheduling, organizing, controlling, reporting, and monitoring IT projects
Use the Help Desk ticketing system for incident and problem management, customer interaction, and follow-up
Create and maintain system configuration documentation, standard operating procedures, runbooks, and architecture diagrams
Maintain reports on system downtime, preventative maintenance plans, and disaster recovery
Contribute to cross-training and task/role planning to create growth and education opportunities for junior staff
Assist with management of Active Directory, Group Policies, users, and computers
Provide Tier-3 escalation support and coordinate or elevate unresolved issues and emergencies according to continuity and disaster recovery plans
Liaise with end users, management, and systems departments to resolve IT support issues
Participate in the on-call rotation for production support and support change management processes
Provide shift-based continuous monitoring of on-premises, remote, and cloud compute, platforms, and storage performance for a global network infrastructure

Requirements

Bachelor’s degree in a computer-related curriculum and 5 years of networking and operating system experience, or AA degree and 6+ years in networking and operating system design, test, and maintenance, or equivalent related experience
Experience managing/implementing VPS Windows and Linux server technologies, including RHEL, CentOS, Alma Linux, Rocky, and Ubuntu, on-premises and in the cloud
Strong understanding of Active Directory, DFS, DNS, DHCP, and Group Policy management
Experience with Microsoft Office 365/Azure, including Exchange Online, Teams, SharePoint Online, InTune, Purview, Copilot Studios/Microsoft Foundry, BLOB storage, NSG, Azure Firewall, and Conditional Access Policies
Experience with hypervisor technologies such as Broadcom/VMware, Hyper-V, and Azure Local
Experience with virtual desktop technologies such as Azure Virtual Desktop, Omnissa Horizon, and Citrix Virtual Desktop
Experience with database technologies including Microsoft SQL, Postgres, and mySQL
Experience with web servers including IIS, Apache/Tomcat, and Nginx
Experience with mail security gateways including IronPort, ProofPoint, and Exchange Online Protection
Experience with identity management and federation services including Microsoft ADFS/Entra, Identity Federation, and Cisco DUO
Experience with platform configuration/monitoring tools such as PRTG, SolarWinds, and Nagios
Knowledge of TCP/IP networking and related network services, including DNS, ARP, VLANs, SMTP, DHCP, and load balancers
Must be self-motivated and able to work in a team environment
Well-refined troubleshooting skills and ability to determine root cause and resolve systemic problems
Ability to manage multiple tasks and prioritize issues effectively
Ability to create, document, and follow processes and procedures
Must be eligible for DoD Personal Security Clearance
Must hold one or more of: VMware Certified Professional (VCP), CompTIA Network+, Microsoft Certified Solutions Associate (MCSA), Cisco Certified Network Associate (CCNA), or CISSP
Must be a U.S. citizen due to U.S. Government contract requirements
Preferred: experience with SAN, NAS, virtual storage, backup technologies, Copilot licensing and Copilot Studio AI apps/bots, Microsoft Enterprise CA, Azure Local, Amazon Kubernetes Services, Azure Virtual Desktop, MFA/federation services, enterprise backup and replication, and Microsoft PowerShell scripting
Must be able to work overtime and on/off shifts as required
On call 24x7 for problem and issue resolution
Able to support rack-mounted equipment up to 7 feet off the ground

Core Competencies

Demonstrates expertise in managing and implementing virtualization platforms, cloud environments, and identity management systems while ensuring high availability and disaster recovery. Proficient in troubleshooting complex IT issues and providing technical leadership across enterprise operations.

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