Network L3 Administrator / Engineer

Network L3 Administrator / Engineer Role Overview The Network L3 Administrator is responsible for advanced management, troubleshooting, and optimization of enterprise network infrastructure. This includes switches, routers, firewalls, WAN/LAN links, and related technologies. The role requires deep expertise in networking, strong problem‑solving skills, and the ability to resolve complex issues independently while supporting enterprise‑scale deployments. Key Responsibilities

• Manage and maintain enterprise network infrastructure (switches, routers, firewalls, WAN/LAN links).
• Provide L3 support for escalated incidents, ensuring timely resolution of complex network issues.
• Configure and optimize routing protocols (OSPF, BGP, EIGRP) and switching technologies (VLANs, STP, trunking).
• Administer and secure firewalls (Cisco ASA, Palo Alto, Fortinet, Check Point).
• Perform patching, upgrades, and configuration management across network devices.
• Conduct performance tuning, capacity planning, and bandwidth optimization.
• Implement network security policies, VPNs, and intrusion prevention systems.
• Automate routine tasks using Python, Ansible, or other scripting tools.
• Collaborate with infrastructure, server, and security teams to ensure seamless delivery of network services.
• Lead root cause analysis for critical incidents and document resolutions.
• Maintain knowledge base and documentation for configurations, processes, and troubleshooting guides. Required Skills & Experience
• 7–12 years of experience in network administration with strong L3 expertise.
• Hands‑on experience with Cisco, Juniper, HP, or Arista switches and routers.
• Strong knowledge of firewall administration (Cisco ASA, Palo Alto, Fortinet, Check Point).
• Expertise in routing protocols, switching technologies, and WAN optimization.
• Experience with VPNs, MPLS, SD‑WAN, and load balancers.
• Familiarity with network monitoring tools (SolarWinds, Nagios, PRTG).
• Proficiency in network automation and scripting (Python, Ansible).
• Solid understanding of network security, IDS/IPS, and compliance standards.
• Ability to lead critical incident resolution and mentor junior administrators. Preferred Qualifications
• Certifications: CCNP, CCIE, JNCIP, PCNSE, NSE, CISSP (for security focus).
• Experience with cloud networking (AWS, Azure, GCP).
• Exposure to SDN (Software‑Defined Networking) and network virtualization (NSX, ACI).
• Knowledge of ITIL processes for incident, problem, and change management.

Skills:

Incident Management, Firewalls, Network Administration, Switches