Systems Administrator - Chesterfield, MO

Systems Administrator

The Systems Administrator is responsible for the administration, maintenance, support, and continuous improvement of the organization's enterprise infrastructure. This role provides technical expertise across servers, virtualization, storage, identity management, and Microsoft cloud technologies while ensuring the stability, security, and performance of critical business systems.

Key Responsibilities

• Infrastructure Administration
• Administer and support Microsoft Windows Server environments.
• Manage Active Directory, Group Policy, DNS, DHCP, and related domain services.
• Maintain enterprise virtualization platforms, including VMware vSphere and associated technologies.
• Monitor and optimize server performance, availability, and capacity planning.
• Implement and maintain disaster recovery and business continuity solutions.
• Perform system upgrades, patch management, and technology lifecycle management.

• Microsoft 365 G Cloud Administration
• Administer Microsoft 365 services, including Exchange Online, Teams, SharePoint, and One Drive.
• Support Microsoft Entra , identity governance, conditional access, and authentication technologies.
• Participate in cloud adoption and modernization initiatives.
• Manage user provisioning, licensing, security policies, and role-based access controls.

• Storage Administration
• Administer and support enterprise storage environments including Pure Storage platforms.
• Monitor storage health, performance, replication, and capacity utilization.
• Develop and execute storage improvement and optimization strategies.

• Security G Compliance
• Maintain system security configurations and assist with cybersecurity initiatives.
• Support vulnerability remediation efforts and security hardening activities.
• Participate in security audits, compliance assessments, and incident response efforts.
• Ensure adherence to established IT governance, policies, and standards.

• Project Delivery G Continuous Improvement
• Lead or participate in infrastructure projects such as migrations, upgrades, consolidations, and system deployments.
• Evaluate emerging technologies and recommend improvements that increase reliability, security, efficiency, and business value.
• Identify opportunities for automation and process optimization.
• Document technical procedures, architecture, standards, and support knowledge.

• Operational Support
• Serve as a Tier III escalation point for complex infrastructure issues.
• Collaborate with help desk, network, security, and application teams to resolve incidents and prevent recurring issues.
• Participate in on-call support and after-hours maintenance activities as required.
• Maintain a strong customer-service orientation while supporting end users and business stakeholders.