Senior System Administrator

Intone Inc; Houston (TX); Hybrid; USD 90,000 - 130,000; Full time

Job summary

Intone Inc in Houston is seeking a Senior System Administrator for a 12-month contract to manage enterprise infrastructure across both on-premises and cloud platforms. The role requires deep expertise in Windows/Linux servers, AD, virtualization (VMware), networking, storage, and firewall management, with hands-on cloud experience (AWS/GCP/Azure).

Responsibilities include implementing IaC, automating tasks, patching, monitoring, and collaborating with teams to ensure reliability, security, and

Qualifications

• 7+ years of experience as a System Administrator or in a similar infrastructure role.
• Experience administering Windows Server and Linux, AD, and group policies.
• Experience with virtualization, networking, storage, and firewall management.

Responsibilities

• Administer and troubleshoot on-premises server infrastructure (Windows and Linux).
• Manage network components for performance, reliability, and security.
• Implement and manage firewall rules for secure networks.
• Design, deploy, and maintain VMware-based virtualized environments.
• Support hybrid cloud environments (AWS, GCP, Azure) and IaC automation.
• Plan and execute vendor patching and OS upgrades.
• Document configurations, diagrams, and project updates.

Skills

Cloud experience

VMware

Active Directory

Infrastructure as Code

Hybrid cloud

Networking & security

Tools

VMware

Active Directory

SonicWall

Palo Alto

Isilon

Vblock

VxRail

Data Domain

Avamar

Windows Server

Linux

Job description

We are seeking a Senior System Administrator for a 12-month contract position based in Houston, Texas. This role manages, maintains, and modernizes enterprise infrastructure across both on-premises and cloud environments. The ideal candidate will possess deep expertise in traditional systems administration, including servers, virtualization, networking, storage, Active Directory, and firewall management, while also demonstrating hands‑on experience with public cloud platforms such as AWS, Google Cloud Platform (GCP), Microsoft Azure, or equivalent cloud technologies.

This position is responsible for ensuring the reliability, security, scalability, and performance of enterprise infrastructure supporting critical business operations. The successful candidate will have experience designing, implementing, and supporting hybrid infrastructure solutions that integrate on‑premises systems with cloud services. Strong expertise in VMware, infrastructure automation, Infrastructure as Code (IaC), vendor management, and project delivery is highly desirable.

Responsibilities

• Administer, maintain, and troubleshoot on‑premise server infrastructure, including Windows and Linux servers.
• Manage and configure network components, ensuring optimal performance, reliability, and security.
• Implement and manage firewall rule configurations to maintain a secure network environment.
• Monitor and maintain system health, ensuring high availability and performance of critical resources.
• Perform server operating system upgrades and manage vendor patching.
• Collaborate with the IT team to design, implement, and maintain virtualized environments using VMware.
• Administer and support hybrid cloud environments, including AWS, GCP, Azure, and related cloud services.
• Design, deploy, and maintain cloud infrastructure, networking, security controls, and monitoring solutions.
• Develop and implement automation scripts and Infrastructure as Code (IaC) solutions to streamline system administration and provisioning tasks.
• Perform routine system audits, updates, and patches to ensure systems remain compliant with security and operational standards.
• Respond to and resolve technical issues in a timely manner, providing excellent user support.
• Document system configurations, procedures, architecture diagrams, and operational changes accurately.
• Administer and manage Active Directory (AD) and domain controllers, ensuring proper configuration and maintenance.
• Create and manage Group Policies (GPOs) to enforce security and compliance requirements.
• Administer and manage firewalls, including SonicWall and Palo Alto firewalls.
• Manage enterprise storage solutions including Isilon, Vblock, VxRail, Data Domain, and Avamar.
• Manage relationships with vendors, ensuring the timely procurement of IT resources and services.
• Lead and participate in infrastructure and cloud migration projects, ensuring project milestones and deliverables are met.
• Communicate effectively with team members, stakeholders, and users to provide clear updates and technical support.
• Prepare and maintain comprehensive documentation, reports, architecture diagrams, and project updates.

Qualifications

• Required
  • 7+ years of experience as a System Administrator, Infrastructure Administrator, Network Administrator, or similar role.
  • Strong expertise supporting enterprise on‑premises infrastructure, including Windows Server, Linux, and Active Directory.