Network Engineer (L2/L3 Cisco & Palo Alto Focus) Northfield, IL 60093 (Onsite)

Role: Network Engineer (L2/L3 Cisco & Palo Alto Focus)

Location: Northfield, IL 60093 (Onsite)

Mandatory Skills:

Cisco Switching & Routing (Catalyst & Nexus)

Job Summary:

The Network Engineer is responsible for the support of enterprise and datacenter network infrastructure, with a strong focus on Cisco switching and routing, Cisco ACI SpineLeaf architectures, and Palo Alto firewalls managed via Panorama. The role involves advanced troubleshooting, change implementation, and collaboration across infrastructure, security, and application teams to ensure secure, highavailability network services.

Key Responsibilities

Cisco ACI (Spine & Leaf)

• Deploy, configure, and maintain Cisco ACI SpineLeaf fabric
• Manage ACI components:
• APIC
• Tenants, VRFs, Bridge Domains, EPGs
• Contracts, policies, and microsegmentation
• Troubleshoot ACI fabric, endpoints, and policy issues
• Support ACI integrations with firewalls, load balancers, and external L3 networks

Network Security Palo Alto

• Configure and manage Palo Alto firewalls
• Centralized management using Panorama
• Implement and maintain:
• Security policies and NAT rules
• IPSec and SSL VPNs
• Threat prevention, URL filtering, and application control
• Troubleshoot firewall and security traffic flows
• Collaborate with security teams on incident response and compliance

Operations & Support

• Act as L2/L3 escalation point for network incidents
• Perform deeplevel troubleshooting and root cause analysis
• Support change management, maintenance windows, and oncall rotations
• Ensure high availability, performance, and resilience of network services

Documentation & Improvement

• Maintain network documentation, diagrams, and SOPs
• Contribute to automation and standardization initiatives
• Assist with audits and operational best practices
• Mentor junior engineers as required

Required Skills & Experience

Technical Skills

• Strong handson experience with:
• Cisco Catalyst & Nexus
• Cisco ACI SpineLeaf architecture
• Palo Alto firewalls and Panorama
• Solid understanding of:
• TCP/IP, DNS, DHCP
• Routing and switching fundamentals
• Network security principles
• Experience with monitoring and troubleshooting tools

Experience

• 4 to 8+ years of network engineering experience
• Experience supporting enterprise or datacenter environments
• Proven experience handling complex network changes and incidents

Certifications (Preferred)

• CCNP Enterprise / Data Center
• Cisco ACI certification
• PCNSE
• ITIL Foundation (nice to have)

Soft Skills

• Strong analytical and troubleshooting skills
• Clear communication and documentation ability
• Ability to work under pressure during outages
• Teamoriented with a proactive mindset