Senior Network Engineer — Lead Infrastructure Modernization

Mitsubishi Chemical America, Inc.; United States; On-site; USD 95,000 - 125,000; Full time

Job summary

Mitsubishi Chemical America, Inc. in Irvine, California, is seeking a Senior Network Engineer to join our Digital team onsite.

You will own network infrastructure, provide hands-on support in a manufacturing environment, and lead upgrades while ensuring security and reliability. The role includes coordinating Citrix migration, overseeing equipment deployments, and delivering Level 1–2 onsite support for desktops and servers.

Qualifications

• Bachelor's degree in computer science, engineering, or related field; equivalent experience considered.
• 7+ years of experience in network administration or engineering, including senior-level responsibilities.
• 2–3 years of hands-on experience with network infrastructure (switches, routers, servers).
• Experience troubleshooting and repairing desktop and laptop hardware.
• Working knowledge of Microsoft technologies and Microsoft 365 administration in a corporate environment.
• Understanding of network architecture, protocols, and security practices.
• Experience coordinating infrastructure upgrades or migrations.
• Basic scripting skills (PowerShell or Python) and interest in automation.

Responsibilities

• Maintain and improve network infrastructure (routers, switches, firewalls, cabling, servers).
• Lead infrastructure projects, equipment upgrades, and deployments with minimal operational disruption.
• Support Citrix transition to PC-based applications, including workstation deployment and legacy server retirement.
• Coordinate connectivity, equipment installation, and PC deployments for facility expansions.
• Manage backups, file recovery, and system restoration for business continuity.
• Provide Level 1–2 onsite support for desktops and laptops.
• Support employees with Microsoft technologies and Microsoft 365 in a corporate environment.
• Troubleshoot complex infrastructure issues, monitor performance, and implement reliability/security improvements.
• Maintain network documentation and topology maps.
• Use basic scripting to automate recurring tasks and grow automation expertise.

Skills

Network administration

Project coordination

Troubleshooting

Scripting (PowerShell/Python)

Microsoft 365 administration

Communication

Education

Bachelor's degree or equivalent

Tools

PowerShell

Python

Job description

Mitsubishi Chemical America, Inc. in Irvine, California, is seeking a Senior Network Engineer to join our Digital team onsite.

You will own network infrastructure, provide hands-on support in a manufacturing environment, and lead upgrades while ensuring security and reliability. The role includes coordinating Citrix migration, overseeing equipment deployments, and delivering Level 1–2 onsite support for desktops and servers.