Senior Network Administrator - Enterprise Infrastructure

Placements24; Sandton; Hybrid; ZAR 900,000 - 1,200,000; Full time

Benefits offered by this job

Competitive salary package

Performance-based bonus

Medical aid and retirement fund

Professional development

Career progression opportunities

Job summary

Placements24 is seeking a Senior Network Administrator in Sandton, Gauteng to design, implement, and secure complex network infrastructure. This role combines on-site and remote work for routine tasks and monitoring, supporting critical infrastructure in a financial services context.

You will oversee routers, switches, firewalls, VPNs, and wireless deployments, while coordinating with other IT teams to ensure seamless service delivery.

Qualifications

• Bachelor's degree in IT or related field, or equivalent experience.
• 6+ years of enterprise network administration experience.
• CCNA/CCNP/JNCIS or equivalent certifications desirable.
• Strong knowledge of TCP/IP, BGP, OSPF, VLANs, STP, WAN technologies.
• Experience with firewalls, VPNs, IDS/IPS.
• Experience with monitoring tools like SolarWinds or Nagios.
• Hybrid work capability and strong communication.

Responsibilities

• Design, implement, configure, and maintain network infrastructure (routers, switches, firewalls, VPNs, wireless).
• Monitor network performance and availability; resolve bottlenecks.
• Ensure network security with firewalls, IDS/IPS, and access controls.
• Perform regular maintenance, updates, and patching.
• Troubleshoot complex network problems and find root causes.
• Develop and maintain network documentation and SOPs.
• Collaborate with IT teams to integrate network services with servers and apps.
• Plan and execute network upgrades and migrations.
• Provide guidance to junior admins and IT staff.
• Stay updated on networking technologies and threats.
• Participate in on-call rotation for emergencies.
• Ensure compliance with business requirements and standards.

Skills

Network design

Troubleshooting

Security

Project planning

Communication

Education

Bachelor's degree in IT/CS

Tools

SolarWinds

Nagios

Cisco ASA

Fortinet

Job description

About the Role Our client, a well-established financial services institution, is seeking a highly competent Senior Network Administrator to enhance their enterprise infrastructure in **Sandton, Gauteng**. This role is crucial for maintaining the stability, performance, and security of the company's extensive network environment. You will be responsible for the design, implementation, management, and troubleshooting of complex network solutions, including LAN, WAN, wireless, and security infrastructure. The ideal candidate will possess expert knowledge of network protocols, hardware, and software, along with strong analytical and problem-solving skills. This position offers a hybrid work arrangement, allowing for a balance between essential on-site presence for critical infrastructure management and the flexibility of remote work for routine tasks and monitoring. You will play a key role in network upgrades, security enhancements, and ensuring seamless connectivity for all business operations. Join a professional team dedicated to upholding high standards of IT service delivery and innovation within the financial sector in **Sandton**.

Key Responsibilities

• Design, implement, configure, and maintain network infrastructure, including routers, switches, firewalls, VPNs, and wireless access points.
• Monitor network performance and availability, identifying and resolving bottlenecks or potential issues.
• Ensure the security of the network through the implementation and management of firewalls, intrusion detection/prevention systems, and access controls.
• Perform regular network maintenance, updates, and patching to ensure systems are secure and running optimally.
• Troubleshoot complex network problems, diagnosing root causes and implementing effective solutions.
• Develop and maintain network documentation, including diagrams, configurations, and standard operating procedures.
• Collaborate with other IT teams to ensure seamless integration of network services with servers, storage, and applications.
• Plan and execute network upgrades and migration projects.
• Provide technical support and guidance to junior network administrators and other IT staff.
• Stay up-to-date with the latest networking technologies, security threats, and industry best practices.
• Participate in on-call rotation for network emergencies.
• Ensure network infrastructure meets business requirements and compliance standards.

Requirements

• Bachelor's degree in Information Technology, Computer Science, or a related field, or equivalent practical experience.
• Relevant industry certifications such as CCNA, CCNP, JNCIS, or equivalent are highly desirable.
• Minimum of 6 years of experience in network administration, with a strong focus on enterprise-level environments.
• In-depth knowledge of TCP/IP, routing protocols (e.g., BGP, OSPF), switching technologies (VLANs, STP), and WAN technologies.
• Experience with network security principles and technologies, including firewalls (e.g., Cisco ASA, Fortinet), VPNs, and IDS/IPS.
• Proficiency in network monitoring tools (e.g., SolarWinds, Nagios).
• Experience with cloud networking concepts (e.g., AWS VPC, Azure VNet) is a plus.
• Strong analytical and problem-solving skills.
• Excellent communication and interpersonal skills, with the ability to explain technical concepts clearly.
• Ability to work effectively both independently and as part of a team, including in a hybrid work setting.
• Experience with network automation tools is an advantage.

Benefits

• Competitive salary package based on experience and qualifications.
• Performance-based bonus opportunities.
• Comprehensive medical aid and retirement fund contributions.
• Opportunities for professional development and certifications.
• Access to modern networking technologies and infrastructure.
• A stable and professional work environment within the financial services sector.
• Generous annual leave and other statutory benefits.
• Potential for career progression to network architect or management roles.