System Administrator II​/System Administrator III – Hybrid – Chesterfield, MO; St. Louis

System Administrator II / III – Hybrid – Chesterfield, MO (St. Louis)

Location:

1 Headquarters, Experitec, Inc. St. Louis, MO

Job Code: 791

# of Openings: 1

At Experitec, you will maintain and enhance enterprise infrastructure, serving as a senior technical resource, leading initiatives, and ensuring secure and reliable operations.

• Trusted technical resource and advanced escalation point for complex IT infrastructure issues across the organization.
• Administer and maintain Windows Server and Linux environments to ensure reliability and performance.
• Manage Active Directory, Azure Active Directory, and Office 365 with advanced policy and compliance configurations.
• Diagnose and resolve complex networking issues, including VPN, VLAN, subnetting, and firewall policies.
• Leverage virtualization platforms to deploy, manage, and decommission virtual servers.
• Write Power Shell scripts and automations to eliminate manual, repetitive tasks.
• Monitor system health, respond to alerts, and proactively maintain enterprise security and uptime.
• Bridge the technical gap between Tier 1/2 helpdesk and senior IT leadership.
• Mentor junior IT team members and contribute to technical documentation and SOPs.
• Participate in infrastructure upgrade, migration, and deployment projects.

• Advanced troubleshooting expertise as primary escalation point between Tier 1/2 support and senior IT staff.
• Hands‑on management of enterprise servers, storage (SAN/NAS), and virtualization platforms.
• Automation of routine processes using Power Shell, Bash, or similar scripting tools.
• Secure, reliable administration of cloud environments (Microsoft Azure) and on‑premises systems.
• Implementation of security best practices, vulnerability remediation, and patch management.
• Technical leadership on infrastructure projects, including migrations, upgrades, and deployments.
• High‑availability and disaster recovery testing to protect business continuity.
• Documentation of technical procedures and knowledge transfer to empower the broader IT team.
• Collaboration with network, security, cloud, and application teams on cross‑functional initiatives.

• Technical Support & Infrastructure Management
  • Administer and maintain Windows and Linux server environments.
  • Manage and support Active Directory, Group Policy, DNS, and DHCP.
  • Design, implement, and maintain enterprise infrastructure solutions.
  • Administer virtualization platforms.
  • Manage cloud environments (Microsoft Azure).
  • Configure and maintain backup, disaster recovery, and business continuity solutions.
  • Monitor system performance, capacity, and availability while proactively identifying and mitigating risks.
• Handling Escalations and Root Cause Analysis
  • Act as escalation point on complex tickets from Tier 1 and 2.
  • Diagnose underlying root causes.
  • Investigate deep system logs, network architecture, and application configurations.
  • Bridge the IT gap to other business units.
  • Lead root cause analysis efforts for critical incidents and recurring problems.
• Managing Infrastructure and High Availability
  • Proactively monitor and optimize enterprise systems.
  • Manage virtualized servers and configure network load balancing.
  • Test disaster recovery and backup systems routinely to ensure maximum uptime.
  • Support high‑availability and failover solutions for critical business systems.
  • Perform capacity planning and infrastructure optimization to support business growth.
• Scripting and Automation
  • Identify ways to eliminate repetitive and manual work.
  • Write complex scripts, such as Power Shell, for Microsoft Entra environments.
  • Automate routine diagnostics, patch management, desktop imaging, and application delivery.
  • Develop and maintain automation scripts using Power Shell, Bash, Python, or similar tools.
• Security and Network Maintenance
  • Implement and enforce overarching security strategies on the ground.
  • Troubleshoot advanced connectivity issues and system outages.
  • Audit directory structures and elevated permissions to maintain a secure environment.
  • Implement security best practices, vulnerability remediation, and system hardening.
  • Monitor and manage patching, updates, and lifecycle maintenance of…