Job Description

Senior L3 Network Engineer

Candidates needing to relocate will NOT be considered. Must already live in or near Pleasanton, CA



Position Overview

We are seeking an experienced Senior L3 Network Engineer to design, deploy, and maintain advanced enterprise network infrastructure across data center, cloud, and operational technology environments. This role requires deep technical expertise in Cisco routing and switching, Palo Alto firewalls, SD-WAN solutions, and cloud networking platforms.

Key Responsibilities

• Provide L3 network support for enterprise and data center environments
• Design and deploy Cisco routing and switching infrastructure, with emphasis on Catalyst 9300 platforms
• Manage advanced routing protocols including BGP (iBGP and eBGP), OSPF, EIGRP, and MPLS
• Configure and support Layer 2 technologies including VLANs, RSTP, EtherChannel, and trunk/access port configurations
• Administer Palo Alto Strata Next-Generation Firewalls, Panorama, and GlobalProtect solutions
• Implement network segmentation and Zero Trust security controls using microsegmentation technologies such as PVLANs, Trustsec/SGTs, or equivalent methods
• Design and support SD-WAN solutions including Cisco SD-WAN (Viptela) and Palo Alto Prisma SD-WAN
• Design and support cloud networking across Azure, AWS, and GCP environments, including ExpressRoute, Direct Connect, and Cloud VPN implementations
• Develop network automation solutions using Terraform and Ansible
• Perform root cause analysis and resolve major network incidents
• Create technical documentation and collaborate with security and infrastructure teams

Required Qualifications

• 10+ years of enterprise network engineering experience
• Strong understanding of Layer 2 protocols and concepts (RSTP, VLANs, trunk/access ports, Layer 2 forwarding, MAC address tables) on the Catalyst 9300 platform
• Strong understanding of BGP routing protocols (iBGP and eBGP)
• Demonstrated design experience developing solutions to solve problems and deliver new network features
• Solid fundamental understanding of Layer 3 networks and routing principles
• Hands-on experience with Cisco Catalyst routing and switching platforms
• Proficiency with Palo Alto Strata firewalls and Panorama management
• Experience designing and implementing microsegmentation technologies (PVLANs, Trustsec/SGTs, or similar)
• Required experience with Terraform and Ansible for infrastructure-as-code and network automation
• Experience with SD-WAN technologies (Cisco Viptela and/or Palo Alto Prisma SD-WAN)
• Cloud networking experience across Azure, AWS, and/or GCP
• Network monitoring and troubleshooting tools (Wireshark, SolarWinds, ThousandEyes, Splunk)
• CCNP or PCNSE certification preferred

Physical Requirements

• Ability to sit for extended periods while performing network engineering tasks
• Ability to lift and carry equipment up to 50 pounds
• Ability to work in data center environments with varying temperature and noise conditions
• Ability to travel to client sites as needed (estimated 10-15% travel)

Additional Qualifications (Preferred)

• CCIE or requivalent
• Meaningful experience with Catalyst 9800 wireless controllers
• Experience working in operational technology (OT) and manufacturing network environments

Important Notice

No artificial intelligence tools are permitted during the interview process. Candidates found using AI during interviews will be immediately disqualified and the interview will be canceled.

Job Tags

Similar Jobs