Senior Network Administrator - Johannesburg South (City Deep)

Our client, a well-established group operating across multiple industries, is seeking to appoint an experienced Senior Network Administrator join their team based in City Deep, Johannesburg.

The Senior Network Administrator is responsible for the configuration, maintenance, security, and performance of the organisation’s network infrastructure. The role ensures stable connectivity, optimal system performance, and provides expert-level support for complex technical issues.

Requirements

Matric

A+ and N+ Certification

Microsoft Certification / Engineer

MCITP

Network Security+

Diploma in IT Systems Administration (NQF Level 4/5 advantageous)

Minimum 5+ years’ experience in IT administration and networking

Hands‑on experience in enterprise network environments

TCP/IP, DNS, DHCP, VLANs, routing protocols

Firewalls, switches, wireless infrastructure

Microsoft Active Directory and Microsoft 365 environments

Windows Server (2019/2022) and Windows 10/11

Hyper‑V virtualization

VPNs (site‑to‑site and client)

Mikrotik RouterOS

Network monitoring tools

VOIP systems

Cloud technologies (Azure, Exchange Online)

Responsibilities Network Operations and Connectivity

Manage LAN, WAN, VPN, VLAN, Wi‑Fi, and internet connectivity

Monitor network performance and resolve complex issues

Configure and maintain routers, switches, firewalls, and access points

Maintain documentation of network configurations and procedures

Ensure connectivity between on‑premise and cloud environments

Manage network emergencies and failover testing

Liaise with service providers and vendors

Provide mentorship to junior IT staff

Network Security

Implement and maintain firewalls and access control policies

Support vulnerability management and patching

Ensure secure remote access for users

Identify and mitigate security risks proactively

Installations, Upgrades and Maintenance

Plan and execute network upgrades and migrations

Maintain firmware updates and configuration standards

Manage server environments and user access controls

Ensure successful backups and disaster recovery processes

Monitor and optimise system performance (CPU, RAM, storage)

IT Projects

Assist with group‑wide IT projects and system improvements

Skills and Competencies

Advanced IT and networking knowledge

Strong problem‑solving and analytical ability

Excellent communication and interpersonal skills

Customer service orientation

Attention to detail and consistency

Ability to work under pressure and manage multiple priorities

Strong initiative and self‑management

Project management capability

Personal Attributes

Accountable and takes ownership

Efficient and results‑driven

Organised and systematic

Team player

Driven and proactive

Growth mindset

Please note that should you not receive a response within 2 weeks of applying, you may consider your application unsuccessful.

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