IT System Administrator
Job in
Irvine, Orange County, California, 92713, USA
Listed on 2026-07-26
Listing for:
CTC Global Corporation
Full Time
position Listed on 2026-07-26
Job specializations:
-
IT/Tech
Systems Administrator, Cybersecurity, Disaster Recovery IT, Windows Server
Job Description & How to Apply Below
This role bridges enterprise IT and operational technology, ensuring reliable, secure, and scalable integration between servers, networks, cloud platforms, and manufacturing systems (PLCs, SCADA, HMIs).The position is critical in supporting business operations, production uptime, cybersecurity initiatives (including Zero Trust), and IT convergence strategies.
ESSENTIAL DUTIES AND RESPONSIBILITIES:
IT Systems Administration (Enterprise)
Administer and maintain:
Windows Server environments, Active Directory, DNS, DHCPVirtual environments (VMware / Hyper-V)
Cloud services (Azure / M365)
Manage system performance, availability, and patching
Support identity and access management (IAM) and Group Policy Provide Tier 2/3 escalation support for infrastructure issues
Network & Infrastructure Support Support LAN, WAN, VPN, wireless, and cloud network connectivity
Assist with configuration and troubleshooting of network devices (switches, firewalls, APs)
Monitor infrastructure performance and availability
Collaborate with network engineering on upgrades and optimizationOT / Industrial Systems Support Support and maintain systems connected to:
PLCs, SCADA, and HMI environments
Industrial control systems (ICS) within manufacturing sites
Ensure reliable system and network communication for production equipment
Assist in troubleshooting production-impacting system issues
Coordinate with manufacturing, automation, and controls teamsIT Integration & Security Support secure integration between IT and OT environments
Implement system-level and network-level segmentation controls
Contribute to Zero Trust Architecture initiatives
Ensure secure authentication, access controls, and system hardening across environments
Backup, Recovery & Business Continuity Manage backup solutions for servers, systems, and critical OT data Develop and maintain disaster recovery procedures
Participate in DR testing and incident recovery
Monitoring, Performance & Optimization Monitor system and infrastructure performance across IT and OT environments
Identify bottlenecks, risks, and availability issues
Implement performance tuning and system improvements
Security & Compliance Apply patches, updates, and security baselines to systems
Support vulnerability remediation and audit requirements
Ensure compliance with corporate policies and regulatory standards
Documentation & Standards Maintain documentation for:
Systems configurations
Network diagrams and dependenciesOT system integrations and workflows
Follow ITIL processes (change, incident, problem management)
Cross-Functional Collaboration Work closely with:
IT Infrastructure and Security teams
Manufacturing / Production teams
Automation and Controls Engineers Provide guidance on system and infrastructure requirements for projects
Support & Continuous Improvement Support Helpdesk escalation tickets
Identify automation opportunities and improve operational efficiency
Mentor junior staff and promote best practices
Education
Bachelor’s degree in Computer Science, Information Systems, or equivalent experience
Certifications (Preferred)
Microsoft (Azure / Windows Server) certificationsCCNA or equivalent networking certification
Security+ or equivalentOT / ICS certifications (a plus)
Professional Experience7+ years of experience in:
Systems Administration Infrastructure / Network SupportOT / Manufacturing environment experience preferred
Experience supporting multi-site or global operations is a plus Technical Skills Systems & Infrastructure Windows Server, Active Directory, Group Policy Virtualization (VMware / Hyper-V)
Microsoft 365 / Azure Backup and recovery platforms
NetworkingTCP/IP, DNS, DHCP, VLANsFirewall and VPN technologies
Wireless and enterprise networkingOT / Industrial Systems (Preferred)
Experience with :
PLC-connected systemsSCADA / HMI platforms
Industrial protocols (Aveva, Modbus, OPC, Ethernet/IP)
Understanding of IT segmentation and secure ICS environments
Key Competencies Strong troubleshooting and analytical skills
Ability to operate across IT and manufacturing environments
Effective communication across technical and business teams
Strong documentation and process discipline
High sense of urgency, especially for production-impacting issues
#J-18808-Ljbffr
To View & Apply for jobs on this site that accept applications from your location or country, tap the button below to make a Search.
(If this job is in fact in your jurisdiction, then you may be using a Proxy or VPN to access this site, and to progress further, you should change your connectivity to another mobile device or PC).
(If this job is in fact in your jurisdiction, then you may be using a Proxy or VPN to access this site, and to progress further, you should change your connectivity to another mobile device or PC).
Search for further Jobs Here:
×