L3 Network Engineer

Sr. L3 Network Engineer

Position Overview

We are seeking a Sr. L3 Network Engineer to join a network infrastructure team. This role requires a highly skilled professional with deep expertise in enterprise network design, implementation, and troubleshooting. You will be responsible for architecting complex network solutions, optimizing network performance, and ensuring secure, reliable connectivity across our infrastructure.

Key Responsibilities

• Design and implement advanced Layer 2 and Layer 3 network architectures using Cisco Catalyst platforms
• Develop and deploy BGP routing strategies for both internal and external network connectivity
• Create innovative network solutions to address complex business requirements and technical challenges
• Implement and manage microsegmentation technologies to enhance network security and isolation
• Collaborate with cross-functional teams to translate business needs into scalable network designs
• Troubleshoot and resolve complex network issues in production environments
• Maintain documentation and best practices for network configurations and procedures
• Provide technical guidance and mentorship to junior network engineers

Required Qualifications

• Strong understanding of Layer 2 protocols and concepts including RSTP, VLANs, Trunk/Access ports, Layer 2 forwarding, and MAC address tables, specifically on the Cisco Catalyst 9300 platform
• Strong understanding of BGP routing protocols, including iBGP and eBGP configurations and optimization
• Proven design experience with the ability to architect solutions and deliver new network features
• Solid fundamental understanding of Layer 3 networks and routing principles
• Hands-on experience designing and implementing microsegmentation technologies such as PVLANs, Trustsec/SGTs, or equivalent security segmentation methods

Hands-on experience with Terraform and Ansible

• Bachelor's degree in Computer Science, Information Technology, or related field, or equivalent professional experience
• 8+ years of enterprise network engineering experience
• Excellent analytical and problem-solving skills
• Strong verbal and written communication abilities

Highly Preferred Qualifications

• Meaningful experience working with Cisco Catalyst 9800 wireless controllers
• Hands-on experience designing and supporting networks in Operational Technology (OT) environments

Physical Requirements

• Ability to lift and carry up to 50 pounds regularly
• Capable of standing, walking, and climbing ladders for extended periods
• Comfortable working in data center environments with varying temperatures and noise levels
• Ability to travel up to 20% for site visits, maintenance, and project deployments