Infrastructure Network Engineer

Job Description Job Description

Infrastructure Network Engineer

Location: San Jose, CA, United States — 100% On-Site
Job Type: Full-Time
Schedule: Full-time on-site
Travel: Occasional local travel within the San Jose / Bay Area, as needed
Salary Range:$90,000–$120,000 annually (based on relevant experience, skills, and qualifications; base salary only)
Benefits: 100% Employer-Paid Medical, Dental, Vision | 401(k) Match | PTO & Holidays | Paid Lunch | Relocation Assistance | Bonus Opportunity

SK AX USA, Inc. delivers specialized IT, infrastructure, and digital transformation services across the United States. We support large-scale, mission-critical programs involving advanced infrastructure, operational technology, and next- AI environments.

Our infrastructure teams help clients design, implement, and maintain reliable technology environments that support daily operations and future growth.

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We are seeking an experienced Infrastructure Network Engineer to design, implement, and manage network infrastructure in San Jose, California.

You will support network availability, scalability, and security through hands-on configuration, monitoring, and troubleshooting across multiple vendor platforms. Your responsibilities will include network design, device administration, performance optimization, cabling coordination, and technical documentation.

Working closely with on-site teams, vendors, and global colleagues, you will resolve technical issues and maintain dependable connectivity across the supported environment.

This role requires strong technical judgment, ownership of day-to-day network operations, and clear communication. Korean proficiency is to support collaboration with our global teams.

• Design and deploy LAN/WAN solutions that meet business requirements for availability, performance, scalability, and security.
• Evaluate network requirements and recommend improvements to architecture, capacity, and connectivity.
• Plan network upgrades and validate configurations and connectivity before implementation.

• Configure and maintain routers, switches, firewalls, L4/L7 load balancers, IP PBX systems, and related network equipment.
• Maintain device configurations, configuration backups, and network inventories.
• Coordinate equipment updates and configuration changes with stakeholders to minimize operational disruption.

• Monitor network availability, utilization, and performance using appropriate monitoring tools.
• Investigate alerts and identify potential capacity, reliability, or security concerns.
• Implement automation to improve routine administration, configuration consistency, and operational efficiency.

• Coordinate UTP and fiber-optic cabling installations, testing, and troubleshooting with vendors and on-site teams.
• Maintain accurate network diagrams, IP address records, device inventories, and configuration documentation.
• Document operating procedures, technical changes, and troubleshooting guidance to support ongoing maintenance and knowledge sharing.

• Diagnose and resolve connectivity, routing, VPN, security, and network performance issues.
• Coordinate with internal teams, service providers, and equipment vendors to restore service.
• Conduct root cause analysis and implement corrective actions to reduce recurring incidents.
• Communicate issue status, operational impact, and resolution progress to relevant stakeholders.

• Maintain secure network configurations, firewall rules, access controls, and VPN connectivity.
• Follow applicable security policies, technical standards, and change…