Senior IT Specialist - Cybersecurity & Infra Irvine Onsite

Thomas Global; Irvine (CA); On-site; USD 85,000 - 95,000; Full time

Benefits offered by this job

Competitive remuneration

Comprehensive benefits package

Aerospace/defense environment

Job summary

Thomas Global Systems in Irvine, California is seeking an IT Specialist to manage, secure, and support the company’s IT infrastructure for on‑site and remote users. You will administer Windows/Linux servers, AD/Entra ID, DNS/DHCP, cloud services, and core business applications while ensuring cybersecurity, patching, backups, and incident response are effective.

The role offers a competitive salary with benefits in a mission‑critical aerospace and defense environment, with vendor management and

Qualifications

• At least five years of hands‑on experience across IT infrastructure, networking, cybersecurity, and user support.
• Strong experience with firewalls, routing, switching, VPNs, VLANs, Wi‑Fi and network troubleshooting.
• Experience with Windows Server, Active Directory/Entra ID, Linux, virtualization and cloud services.
• Practical experience with endpoint security, MFA, patching, monitoring, backup, and recovery.
• Experience managing onboarding/offboarding, software licensing, IT assets and equipment deployment.
• Experience managing third‑party IT providers and service agreements.
• Strong troubleshooting, organizational, and communication skills, with the ability to work independently.
• Relevant certifications such as Security+, Network+, CCNA/CCNP, CISSP or CISM, preferred.

Responsibilities

• Manage and improve network infrastructure, including switches, routers, Wi‑Fi, VPNs, VLANs, and firewalls.
• Administer Windows/Linux servers, Active Directory/Entra ID, DNS, DHCP, virtualization platforms, cloud services and core business applications.
• Manage technology deployment, software licensing, equipment replacement, and IT purchasing.
• Provide day‑to‑day IT support for employees and contractors across office, remote and off‑site environments.
• Manage onboarding, access changes and offboarding, including equipment, accounts, permissions, and company data.
• Provide practical user guidance and security awareness support.
• Maintain endpoint, email, web and identity security controls, including MFA and appropriate access protections.
• Monitor systems, logs and alerts; manage vulnerabilities, patching, configuration standards, and incident response.
• Maintain backup and recovery processes, test restoration capability, and support business continuity planning.
• Evaluate and manage IT providers, service agreements, renewals, escalations and vendor performance.
• Maintain IT asset records, network diagrams, procedures, and other key system documentation.
• Support cybersecurity and compliance requirements, including CMMC/NIST controls and assessment activities.
• Provide regular management reporting and recommend improvements to IT reliability, security, efficiency, and user experience.

Job description

Thomas Global Systems in Irvine, California is seeking an IT Specialist to manage, secure, and support the company’s IT infrastructure for on‑site and remote users. You will administer Windows/Linux servers, AD/Entra ID, DNS/DHCP, cloud services, and core business applications while ensuring cybersecurity, patching, backups, and incident response are effective.

The role offers a competitive salary with benefits in a mission‑critical aerospace and defense environment, with vendor management and