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.
Together, as owners, let’s turn meaningful insights into action.
Life at CGI is rooted in ownership, teamwork, respect and belonging. Here, you’ll reach your full potential because…
You are invited to be an owner from day 1 as we work together to bring our Dream to life. That’s why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our company’s strategy and direction.
Your work creates value. You’ll develop innovative solutions and build relationships with teammates and clients while accessing global capabilities to scale your ideas, embrace new opportunities, and benefit from expansive industry and technology expertise.
You’ll shape your career by joining a company built to grow and last. You’ll be supported by leaders who care about your health and well-being and provide you with opportunities to deepen your skills and broaden your horizons.
Come join our team—one of the largest IT and business consulting services firms in the world.