Sr. Network Security Engineer

Yoh has an exciting opportunity for a Senior Network Security Engineer to join our advanced technology client. This is a hands‑on senior engineering role focused on securing and scaling complex enterprise network environments, with a strong emphasis on Palo Alto Networks, firewall architecture, network segmentation, VPN/security connectivity, and network automation.

The team is primarily targeting candidates in the San Mateo, CA area, with Washington, D.C. also a strong preferred location. Candidates near Santa Clarita or San Diego, CA, and Frisco, TX may also be considered. The position offers some flexibility in work arrangement depending on location and business needs, with occasional travel potentially required.

Senior Network Security Engineer

San Mateo, CA preferred;
Washington, D.C. also strongly considered; additional locations may include Santa Clarita, CA;
San Diego, CA; and Frisco, TX

Contract

$70-105/hr DOE

Must be a U.S. Citizen or Green Card Holder (ITAR / CUI environment)

$66.50

$95.00

• Engineer and support secure network infrastructure across corporate offices, data centers, remote locations, and cloud-connected environments.
• Configure, administer, and enhance Palo Alto Networks technologies, including PAN-OS, Panorama, Global Protect, threat protection, application controls, and related security capabilities.
• Manage firewall rules, network segmentation, NAT, site-to-site and remote‑access VPNs, and secure connectivity solutions.
• Support network access controls, authentication technologies, and Zero Trust/SASE initiatives.
• Investigate network traffic, security events, connectivity issues, and vulnerabilities while assisting with remediation and incident response.
• Perform firewall upgrades, configuration hardening, lifecycle maintenance, and production changes.
• Troubleshoot complex routing, switching, WAN, wireless, firewall, application‑access, and performance issues.
• Support secure network connectivity between enterprise infrastructure and cloud environments, including AWS and Azure.
• Collaborate with network, cloud, infrastructure, and cybersecurity teams on architecture and technical implementations.
• Develop automation for network and security operations using tools such as Terraform, Ansible, Python, or Bash.
• Create and maintain technical documentation, network diagrams, configuration standards, and operational runbooks.
• Provide senior‑level escalation support for critical network and security incidents.
• Participate in planned maintenance, on‑call support, and technical knowledge sharing with other engineers.

• 6+ years of professional experience supporting network security within complex enterprise or production environments.
• Advanced hands‑on experience with Palo Alto Networks
  , particularly PAN-OS and Panorama.
• Strong understanding of firewalls, segmentation, NAT, VPN technologies, threat prevention, routing, switching, and network troubleshooting.
• Experience working with enterprise networking platforms such as Juniper, Cisco, or Arista
  .
• Hands‑on experience with network automation or infrastructure‑as‑code tools such as Terraform, Ansible, Python, or Bash
  .
• Ability to independently lead technical initiatives and resolve complex, business‑critical network and security problems.
• Strong written and verbal communication skills with the ability to work effectively across technical teams.
• Bachelor's degree in a technical field or equivalent combination of education and professional experience.

• Experience with Palo Alto Global Protect, Prisma Access, Cloud NGFW, SASE, and/or Zero Trust architectures.
• Experience administering Juniper routing and switching…