Sr. L3 Network Engineer

About This Opportunity

CTI Staffing is partnering with a leading global consumer products organization to find a Senior Network Engineer III for their network infrastructure team, based in Pleasanton, CA.

This team owns enterprise network design and security across a large, complex environment. You'll be the engineer other teams come to when a routing problem or a segmentation project needs real expertise, not a quick patch. This role has room to shape how the network is architected going forward, not just maintain what's already built.

What You'll Do

• Design and implement Layer 2 and Layer 3 network architectures on enterprise Cisco Catalyst platforms
  
• Develop and deploy BGP routing strategies for internal and external connectivity
  
• Build microsegmentation solutions to strengthen network security and isolation
  
• Automate network configuration and deployment using Terraform and Ansible
  
• Translate business requirements into scalable network designs alongside cross-functional teams
  
• Troubleshoot complex network issues in live production environments
  
• Maintain documentation and configuration standards for the network team
  
• Mentor junior network engineers on design and troubleshooting practices
  

Requirements

What You Bring

Must-Have:

• 8+ years of enterprise network engineering experience
  
• Strong hands-on knowledge of Layer 2 protocols (RSTP, VLANs, trunk/access ports, MAC address tables), specifically on Cisco Catalyst 9300 platforms
  
• Proven hands-on experience with BGP routing (iBGP and eBGP configuration and optimization)
  
• Genuine hands-on experience with Terraform and Ansible for network automation
  
• Hands-on experience implementing microsegmentation (PVLANs, TrustSec/SGTs, or equivalent)
  
• Demonstrated ability to architect network solutions independently, not just maintain existing designs
  
• Bachelor's degree in Computer Science, IT, or related field, or equivalent professional experience
  
• Strong analytical, troubleshooting, and communication skills
  

Nice-to-Have:

• Experience with Cisco Catalyst 9800 wireless controllers
  
• Experience designing or supporting networks in Operational Technology (OT) environments
  

Technical Environment:

• Cisco Catalyst 9300/9800
  
• BGP (iBGP/eBGP)
  
• Terraform, Ansible
  
• PVLANs, TrustSec/SGT
  

What Success Looks Like:

• Independently owns network design decisions within the first 6 months
  
• Has delivered at least one complete routing or microsegmentation project
  
• Is mentoring junior engineers without needing to be prompted