Industrial Network Security Engineer: OT/IT Onsite

Hithium Tech USA Inc HQ; Forney (TX); On-site; USD 120,000 - 160,000; Full time

Job summary

Hithium Tech USA Inc HQ seeks a Network Security Engineer to design, implement, and secure Cisco-based LAN/WAN and OT networks in a fast-paced manufacturing environment.

The role requires hands-on expertise, strong documentation, and collaboration with IT and operations teams. Onsite work in Forney, TX is required, with no remote option.

Candidates should have 5+ years networking and 3–5 years cybersecurity, plus Cisco and firewall/VPN experience; Mandarin proficiency is a plus.

Qualifications

• Bachelor's degree in Computer Science, Information Technology, Cybersecurity, or a related field.
• Minimum 5 years of professional networking experience.
• Minimum 3–5 years of cybersecurity experience.
• Strong hands-on expertise with Cisco networking technologies.
• Experience with firewalls, VPNs, IDS/IPS, network segmentation, authentication technologies, and access controls.
• Manufacturing environment experience preferred with OT network requirements.
• Excellent troubleshooting, documentation, and communication skills.
• Ability to work onsite with cross-functional teams in a manufacturing environment (no remote work).
• Proficiency in Mandarin.

Responsibilities

• Design, implement, and maintain Cisco-based LAN/WAN infrastructure across enterprise and manufacturing environments.
• Configure, manage, and troubleshoot Cisco routers, switches, wireless infrastructure, and network appliances.
• Monitor and analyze network performance to ensure high availability and reliability.
• Support OT and IT network segmentation initiatives to maintain security and uptime.
• Perform network upgrades, capacity planning, and infrastructure optimization.
• Maintain accurate network documentation, diagrams, and SOPs.
• Assist with day-to-day break/fix network incidents and escalated support requests.
• Administer and support firewalls, VPNs, and other network security technologies.
• Monitor security alerts and investigate suspicious activity across enterprise and OT environments.
• Assist with vulnerability management, remediation, and patch management processes.
• Participate in security incident response activities and security audits.

Skills

Cisco networking

Network security

Troubleshooting

Documentation

Communication

Mandarin

Onsite work

Education

Bachelor's degree in CS/IT/Cybersecurity or related field

Tools

Cisco networking devices

Firewalls/VPNs/IDS/IPS

VPNs

IDS/IPS

Network monitoring

Job description

Hithium Tech USA Inc HQ seeks a Network Security Engineer to design, implement, and secure Cisco-based LAN/WAN and OT networks in a fast-paced manufacturing environment.

The role requires hands-on expertise, strong documentation, and collaboration with IT and operations teams. Onsite work in Forney, TX is required, with no remote option.

Candidates should have 5+ years networking and 3–5 years cybersecurity, plus Cisco and firewall/VPN experience; Mandarin proficiency is a plus.