Senior Network Specialist

Ntt Data; Johannesburg; On-site; ZAR 300,000 - 540,000; Full time

Job summary

NTT Data in Johannesburg is seeking a Network Administrator to oversee the day-to-day operation, performance, availability, and documentation of our network infrastructure across sites. You will ensure stable and secure services to support business operations.

The role focuses on WAN/LAN, routers and switches, firewall and VPN management, documentation, and collaboration with vendors and service providers to meet SLAs and drive continuous improvement.

Qualifications

• Matric and a national IT diploma or degree are required.
• Professional networking certifications (CCNP, Network+) are preferred.
• Certifications in Fortinet or Palo Alto firewalls are advantageous.
• ITIL Foundation is an asset for service management.

Responsibilities

• Oversee day-to-day administration of network infrastructure across sites.
• Manage routers, switches, wireless, WAN/LAN, DMZ, VPN, and firewall services.
• Maintain documentation, diagrams, and SOPs for networks.
• Coordinate with partners for incident resolution, upgrades, and changes.
• Monitor performance, ensure SLAs, and drive improvements.

Skills

Enterprise networking

LAN/WAN

Firewall & VPN security

Network troubleshooting

Documentation

Vendor coordination

Education

Matric and National Diploma or Bachelor's Degree in IT

CCNP

CompTIA Network+

Fortinet / Palo Alto firewall certs

ITIL Foundation

Job description

The Network Administrator is responsible for the day-to-day operational administration, availability, performance, and documentation of the network infrastructure across all sites. This role ensures stable, secure, and efficient network services while meeting agreed service levels and supporting business operations.

Responsibilities

Network Infrastructure Operations

• Perform day-to-day operational administration of network infrastructure, including:


• Routers, switches, and wireless infrastructure


• Internet access services


• Wide Area Network (WAN) infrastructure and services


• Local Area Network (LAN) infrastructure and services


• Manage and support:


• DMZ, firewall, VPN, APN, and proxy infrastructure and services


• Fixed infrastructure, including fibre and Ethernet cabling


• Maintain and oversee network patch rooms and network-related areas across all Clover sites

Performance & Monitoring

• Ensure system performance and availability targets are met in line with agreed Service Level Agreements (SLAs)


• Monitor network infrastructure through the outsourced Network Operations Centre (NOC)


• Proactively identify and resolve network performance, availability, and security issues


• Work closely with third-party service providers to ensure efficient operations and service delivery


• Coordinate with vendors for incident resolution, maintenance, and upgrades


• Liaise daily with users and resolve network-related calls and incidents

Documentation & Standards

• Create, maintain, and update:


• Network architecture diagrams for all Clover installations


• Logical network diagrams within the assigned area of responsibility


• Standard Operating Procedures (SOPs) within area of responsibility


• Accurate and up-to-date documentation for network configurations and processes

Projects & Continuous Improvement

• Manage and participate in small network-related projects within area of responsibility


• Assist with network upgrades, changes, and optimisation initiatives


• Identify opportunities to improve network reliability, performance, and operational efficiency

Qualifications

• Matric and National Diploma or Bachelor's Degree in Information Technology


• Cisco Certified Network Professional (CCNP)


• CompTIA Network+


• Fortinet / Palo Alto / firewall-related certifications


• ITIL Foundation

Skills

• Strong knowledge of enterprise networking (LAN, WAN, wireless)


• Understanding of firewalls, VPNs, DMZs, and security best practices


• Experience working with ISPs and managed service providers


• Strong troubleshooting and problem-solving skills


• Ability to document technical environments clearly and accurately


• Good communication skills with both technical and non-technical users