Senior System Administrator

Grapevine Texas

$60-$80 per hour

Stelvio is seeking a mid-to-senior level Infrastructure Security Engineer / Systems Administrator with strong hands-on experience across enterprise production environments.

This role is ideal for an infrastructure professional who combines deep systems administration expertise with a strong understanding of cybersecurity, vulnerability remediation, and patch management best practices.

You will act as a key bridge between Infrastructure and Security, taking ownership of patching, remediation, and operational stability across a predominantly on-prem Windows / Hyper-V environment.

Work Environment

• Hybrid working model (on-site presence required)
• Participation in after-hours maintenance windows
• Flexibility provided when working outside standard hours

Environment Overview

• Primarily on-premise infrastructure across North America
• Global Azure / AWS cloud footprint in selected regions
• Highly available production environments with clustered / virtualized infrastructure
• Focus on maintaining, securing, and optimizing existing enterprise systems

Key Responsibilities

Patch Management & Vulnerability Remediation (Primary Focus)

• Own and execute enterprise patch management processes across production Windows server environments
• Lead vulnerability remediation efforts, including assessment, prioritization, testing, deployment, and validation
• Respond to urgent cybersecurity vulnerabilities / CVEs / zero-day threats and coordinate remediation plans
• Balance remediation urgency with production stability and operational risk
• Maintain remediation documentation, patch reporting, and audit/compliance records

Infrastructure & Virtualization Support

• Administer and support enterprise Windows Server infrastructure
• Manage and maintain Hyper-V environments, including clustered / high-availability hosts
• Patch and maintain Hyper-V hosts / virtual infrastructure while preserving uptime and resilience
• Troubleshoot production infrastructure issues and perform root cause analysis
• Monitor performance, health, and availability across server / virtualization environments

Security & Compliance

• Implement system hardening and secure configuration standards
• Partner with Security teams on vulnerability management, remediation, and audit readiness
• Support enterprise security tools / monitoring / endpoint security platforms
• Maintain compliance with internal security policies and external frameworks

Operational Support

• Participate in change management processes and maintenance windows
• Support incident response and remediation efforts
• Contribute to continuous improvement of patching / remediation / operational workflows

Required Experience

Must Have

• 5 years in Systems Administration / Infrastructure Engineering / Enterprise Infrastructure Support
• Strong hands-on Windows Server administration experience
• Proven ownership of patch management / patch deployment in production environments
• Experience with vulnerability remediation and cybersecurity prioritization
• Hands-on experience supporting Hyper-V environments / clustered virtualization infrastructure
• Strong troubleshooting / root cause analysis skills
• Experience supporting high-availability production environments

Preferred

• Linux administration experience (Red Hat / similar)
• Experience with security / vulnerability tools such as:
• Qualys
• Nessus
• Rapid7
• CrowdStrike
• Similar enterprise platforms
• PowerShell / scripting / automation experience
• Familiarity with security frameworks:
• NIST
• ISO 27001
• CIS

Ideal Candidate Profile

• Infrastructure-first engineer with strong cybersecurity awareness
• Understands how to prioritize vulnerabilities based on business risk and exposure
• Comfortable owning remediation in live production environments
• Strong sense of accountability and urgency
• Able to communicate effectively across Infrastructure and Security teams