System Administrator

Prophecy Technologies; Chicago (IL); On-site; USD 85,000 - 115,000; Full time

Job summary

A leading technology firm in Chicago seeks a Mid-Senior level Senior System Administrator to architect, implement, and maintain enterprise systems. You will oversee virtualization, systems management, and assist in driving modernization through automation and standardization. Strong experience with VMware, Windows Server, and networking security is required. Join a collaborative team committed to optimizing IT infrastructure.

Qualifications

• 5+ years of experience in systems administration.
• Strong understanding of virtualization, storage, and network security.
• Experience with disaster recovery and backup solutions.

Responsibilities

• Architect and maintain enterprise systems and infrastructure.
• Lead monitoring and observability initiatives.
• Mentor junior team members.

Tools

VMware vSphere, ESXi, and vCenter

Windows Server (2016/2019/2022)

Linux (RHEL, Ubuntu, CentOS)

Active Directory

PowerShell

Bash

Ansible

SolarWinds

Grafana

Splunk

Job description

Senior System Administrator (Prophecy Technologies)

Job Title: Senior System Administrator

Department: IT Infrastructure & Operations

Location: Joliet, IL

PURPOSE

The Senior System Administrator is responsible for architecting, implementing, and maintaining the organization’s enterprise systems and infrastructure to ensure optimal performance, scalability, and security. This role provides leadership across virtualization, systems, and storage management, supporting mission‑critical workloads and driving modernization through automation, observability, and standardization. The Senior System Administrator serves as a senior technical escalation point, mentors junior team members, and ensures adherence to corporate cybersecurity and compliance standards.

Infrastructure & Systems Management

• Design, configure, and maintain VMware vSphere, ESXi, and vCenter environments.
• Administer Windows Server (2016/2019/2022) and Linux (RHEL, Ubuntu, CentOS) systems, including patching, configuration, and security hardening.
• Manage Active Directory, Group Policy, DNS, and DHCP for secure identity and network operations.
• Implement and maintain Veeam Backup & Replication for enterprise‑class backup and disaster recovery.
• Support enterprise SAN/NAS storage systems, ensuring high availability and lifecycle optimization.

Network & Security

• Configure and maintain firewalls, VPNs, and network appliances (Cisco, Fortinet, Palo Alto).
• Work with the Cybersecurity team to ensure system patching, endpoint protection, and compliance with DMARC/SPF/DKIM standards.
• Monitor system and network performance proactively and perform capacity planning.
• Maintain strict system hardening, access control, and audit compliance.

Automation, Monitoring & Reliability

• Develop automation scripts using PowerShell, Bash, or Ansible to streamline system operations.
• Implement and maintain monitoring and observability tools such as SolarWinds, Dynatrace, Grafana, or Splunk.
• Lead root cause analysis and implement preventive and corrective actions for high‑impact incidents.
• Participate in continuous improvement initiatives for infrastructure automation and operational resilience.
• Serve as Tier‑3 escalation for complex infrastructure and system issues.
• Collaborate with IT leadership to define infrastructure strategy, capacity planning, and modernization initiatives.
• Mentor junior administrators and ensure operational standards and documentation are maintained.
• Participate in on‑call rotation and perform after‑hours maintenance as required.

Seniority Level

Mid‑Senior level

Employment Type

Contract

Job Function

Administrative, Business Development, and Customer Service

Industries

Software Development, Motor Vehicle Manufacturing, and IT Services and IT Consulting