Senior Network Support Engineer – L3 (Firewalls & SD-WAN)

HCLTech; Johannesburg; On-site; ZAR 700,000 - 950,000; Full time

Job summary

HCLTech is seeking a Network Support Engineer – L3 in Johannesburg to own complex incidents, perform RCA, and drive continuous network improvements. You will design and review intricate network and firewall changes, mentor L2 engineers, and contribute to runbooks and SOPs.

The role requires 7–12 years of experience with Cisco Fortinet firewalls, SDWAN, and proactive monitoring using SolarWinds and Cisco DNA Center. On-call shifts and business hours are expected.

Qualifications

• 7–12 years of network engineering experience.
• Expertise in Cisco LAN/WAN, Wireless, and Fortinet FortiGate firewalls.
• Strong SDWAN and VPN troubleshooting experience.
• Excellent documentation and stakeholder management skills.

Responsibilities

• Lead L3 incident resolution and perform Root Cause Analysis (RCA).
• Design, review, and implement complex network and firewall changes.
• Act as SME for Cisco LAN/WAN, Wireless, SDWAN issues and configurations.
• Perform advanced firewall troubleshooting—Policy optimization, NAT, VPN, and traffic analysis.
• Use SolarWinds and Cisco DNA Center for proactive monitoring and assurance.
• Drive problem management and preventive initiatives.
• Maintain runbooks, SOPs, and network documentation.
• Support security audits and customer reviews; coordinate with TAC teams.
• Mentor L2 engineers and provide technical guidance.
• Participate in architecture reviews and network optimization discussions.

Skills

Root Cause Analysis

Incident management

Network design

SDWAN

Firewalls

Cisco devices

Fortinet FortiGate

Documentation

Mentoring

Stakeholder management

Tools

SolarWinds

Cisco DNA Center

Job description

HCLTech is seeking a Network Support Engineer – L3 in Johannesburg to own complex incidents, perform RCA, and drive continuous network improvements. You will design and review intricate network and firewall changes, mentor L2 engineers, and contribute to runbooks and SOPs.

The role requires 7–12 years of experience with Cisco Fortinet firewalls, SDWAN, and proactive monitoring using SolarWinds and Cisco DNA Center. On-call shifts and business hours are expected.