Network/Security Administrator - Centurion

DataFin; Centurion, Pretoria; On-site; ZAR 200 000 - 300 000; Full time

Job summary

A software company in Centurion is seeking a motivated Network/Security Administrator. The ideal candidate has 2-4 years of experience, strong skills in Cisco networking, and holds a CCNA certification. Responsibilities include configuring routers, maintaining security protocols, and monitoring network performance. Join a dynamic team focused on digital transformation.

Qualifications

• 2-4 years of experience in configuring and maintaining enterprise networks.
• Proven expertise in LAN/WAN infrastructure.
• Adept at identifying vulnerabilities and optimizing network performance.

Responsibilities

• Configure and troubleshoot Cisco routers and switches.
• Maintain network security through ACLs and firewall rules.
• Manage VPN access for remote users.
• Monitor network traffic to detect anomalies.
• Implement routine security patches.

Skills

Cisco routing and switching

Firewall administration

VPN setup

Network monitoring

ITIL / Ticketing systems

Basic scripting (Python, Bash)

Education

Cisco Certified Network Associate (CCNA)

CompTIA Security+

Cisco Certified CyberOps Associate

Tools

SolarWinds

Nagios

Wireshark

Nessus

SIEM tools (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 access control lists (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 (802.1X, NAC)
• 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+
• (Optional) 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