Senior Network Engineer

Advantest America; San Jose (CA); On-site; USD 120,000 - 180,000; Full time

Job summary

Advantest America is seeking a Senior Network Engineer to design, support, and maintain our enterprise network. You will own day‑to‑day operations and drive architecture for deployments, with hands‑on expertise in switching, firewalls, VPNs, and multi‑vendor environments.

The role includes on‑call rotation, change management, and collaboration with security and systems teams. You will design and implement scalable LAN/WAN solutions, develop routing designs, manage IPsec VPNs, and ensure secure,

Qualifications

• Design scalable, resilient LAN, WAN, and remote-access solutions to support business growth.
• Lead network components of infrastructure projects, including site build-outs and migrations.
• Configure and maintain Layer 2/Layer 3 switches, VLANs, trunking, and inter-VLAN routing.

Responsibilities

• Serve as an escalation point for complex network incidents, performing root cause analysis and driving issues to resolution within SLA
• Monitor network health, capacity, and performance; proactively identify and remediate bottlenecks before they impact users
• Troubleshoot connectivity issues across VLANs, routing, switching, DNS, DHCP, TCP/IP, and WAN/ISP links
• Use packet capture and network monitoring tools to diagnose latency, packet loss, and application performance problems
• Manage firmware upgrades, patching, and configuration backups following established change management procedures
• Participate in an on‑call rotation and support scheduled maintenance windows
• Design scalable, resilient LAN, WAN, and remote‑access solutions that support business growth
• Develop network diagrams, IP addressing schemes, VLAN plans, and routing designs
• Evaluate and recommend hardware, software, and circuits; participate in vendor selection and technical evaluations
• Lead network components of infrastructure projects - site build‑outs, migrations, refreshes, and cloud connectivity
• Define and maintain network standards, baseline configurations, and technical documentation
• Configure and maintain Layer 2/Layer 3 switches, including VLANs, trunking, spanning tree, port security, link aggregation, and inter‑VLAN routing
• Configure and maintain routing protocols (OSPF, BGP, EIGRP, static routing) across the enterprise WAN
• Administer enterprise firewalls: security policies, NAT, application control, and access control rules
• Build and maintain site‑to‑site IPsec VPN tunnels between offices, data centers, and third‑party partners, including troubleshooting Phase 1/Phase 2 negotiation, rekeying, and tunnel stability issues
• Deploy and support remote‑access VPN (SSL/IPsec) for end users, including authentication integration and client troubleshooting
• Implement network segmentation and access control between environments
• Maintain accurate network documentation, runbooks, and as‑built diagrams
• Provide technical mentorship to junior engineers and help‑desk staff
• Work with systems, application, and security teams on cross‑functional initiatives
• Communicate clearly with non‑technical stakeholders during outages and project planning

Skills

L2/L3 switching

Enterprise firewalls

VPN technologies

Network troubleshooting

VLANs & routing

OSPF/BGP/EIGRP

IPsec VPN

Job description

Job Description:

We are seeking a Senior Network Engineer to support, design, and maintain our enterprise network infrastructure. This role owns day-to-day network operations while also driving architecture and configuration work for new deployments and upgrades. The ideal candidate has deep hands‑on expertise with Layer 2/Layer 3 switching, enterprise firewalls, and VPN technologies, and can troubleshoot complex issues across multi‑vendor environments with minimal supervision. Security experience is a strong plus.

Responsibilities include:

Network Operations & Support

• Serve as an escalation point for complex network incidents, performing root cause analysis and driving issues to resolution within SLA
• Monitor network health, capacity, and performance; proactively identify and remediate bottlenecks before they impact users
• Troubleshoot connectivity issues across VLANs, routing, switching, DNS, DHCP, TCP/IP, and WAN/ISP links
• Use packet capture and network monitoring tools to diagnose latency, packet loss, and application performance problems
• Manage firmware upgrades, patching, and configuration backups following established change management procedures
• Participate in an on‑call rotation and support scheduled maintenance windows

Network Design & Architecture

• Design scalable, resilient LAN, WAN, and remote‑access solutions that support business growth
• Develop network diagrams, IP addressing schemes, VLAN plans, and routing designs
• Evaluate and recommend hardware, software, and circuits; participate in vendor selection and technical evaluations
• Lead network components of infrastructure projects - site build‑outs, migrations, refreshes, and cloud connectivity
• Define and maintain network standards, baseline configurations, and technical documentation

Configuration & Implementation

• Configure and maintain Layer 2/Layer 3 switches, including VLANs, trunking, spanning tree, port security, link aggregation, and inter‑VLAN routing
• Configure and maintain routing protocols (OSPF, BGP, EIGRP, static routing) across the enterprise WAN
• Administer enterprise firewalls: security policies, NAT, application control, and access control rules
• Build and maintain site‑to‑site IPsec VPN tunnels between offices, data centers, and third‑party partners, including troubleshooting Phase 1/Phase 2 negotiation, rekeying, and tunnel stability issues
• Deploy and support remote‑access VPN (SSL/IPsec) for end users, including authentication integration and client troubleshooting
• Implement network segmentation and access control between environments

Collaboration & Documentation

• Maintain accurate network documentation, runbooks, and as‑built diagrams
• Provide technical mentorship to junior engineers and help‑desk staff
• Work with systems, application, and security teams on cross‑functional initiatives
• Communicate clearly with non‑technical stakeholders during outages and project planning