Network / Security Administrator - Centurion

Datafin; Pretoria; On-site; ZAR 200 000 - 300 000; Full time

Job summary

A software company focusing on digital transformation is seeking a motivated Network / Security Administrator in Pretoria. Responsibilities include configuring Cisco networks, maintaining security protocols, and monitoring performance. Required qualifications include 2–4 years of experience in network management, CCNA certification, and strong analytical skills. Join a dynamic team and grow your career in cybersecurity.

Qualifications

• 2–4 years of hands-on experience in configuring, maintaining, and securing enterprise networks.
• Adept at identifying vulnerabilities and optimizing network performance.
• Experience with compliance and best practices.

Responsibilities

• Configure and troubleshoot Cisco routers and switches in enterprise environments.
• Maintain network security through firewall rules and intrusion prevention systems.
• Manage VPN access for remote users and branch offices.
• Monitor network traffic and performance for anomalies or malicious activity.
• Implement routine security patches and firmware updates on network devices.
• Collaborate with security teams to support audits and compliance checks.
• Respond to Tier 1 and Tier 2 security incidents.

Skills

Cisco routing and switching

Firewall administration

VPN setup

Network monitoring

Vulnerability scanning

Windows Server

Linux

ITIL / Ticketing systems

Basic scripting (Python, Bash)

Education

Cisco Certified Network Associate (CCNA)

CompTIA Security+

Cisco Certified CyberOps Associate

Tools

SolarWinds

Nagios

Wireshark

Nessus

Splunk

Graylog

ELK stack

Job description

Overview

A Software Company with a focus on digital transformation is seeking a motivated and detail-oriented Network / Security Administrator with over 2–4 years of hands‑on experience in configuring, maintaining, and securing enterprise networks.

CCNA with proven expertise in LAN / WAN infrastructure, firewall policies, VPN deployment, and network monitoring.

Adept at identifying vulnerabilities, optimizing network performance, and responding to incidents in compliance with best practices and organizational policies.

Duties

• Configure and troubleshoot Cisco routers and switches in enterprise environments.
• Maintain network security through ACLs, firewall rules, and intrusion prevention systems.
• Manage VPN access for remote users and branch offices.
• Monitor network traffic and performance to detect anomalies or malicious activity.
• Implement routine security patches and firmware updates on network devices.
• Collaborate with security teams to support audits and compliance checks.
• Respond to and document Tier 1 and Tier 2 security incidents.
• Maintain up‑to‑date network diagrams and documentation.

Requirements

Technical Skills :

• Networking: Cisco routing and switching (IOS configuration, EIGRP, OSPF, VLANs, STP)
• Security: Firewall administration (Cisco ASA, Palo Alto, Fortinet); VPN setup (IPSec, SSL); IDS / IPS; Network Access Control
• Tools: Network monitoring (SolarWinds, Nagios, Wireshark); Vulnerability scanning (Nessus); SIEM tools (Splunk, Graylog, ELK stack)
• Systems: Windows Server, Active Directory; Linux
• Administrative: ITIL / Ticketing systems (e.g., ServiceNow); Basic scripting (Python, Bash)
• Certifications: Cisco Certified Network Associate (CCNA)
• Optional: CompTIA Security+; Cisco Certified CyberOps Associate

Technical Environment

• Cisco Catalyst and ISR series
• Cisco ASA or Firepower
• Windows Server, Active Directory
• Linux for monitoring / security tools
• Syslog servers, SIEM tools (Splunk, Graylog, or ELK stack)

Attributes

• Strong analytical and troubleshooting skills
• Effective communicator with cross‑functional teams
• Process‑oriented with an eye for documentation
• Continual learner with a strong interest in cybersecurity