It Administrator

GMI Advisory; Johannesburg; On-site; ZAR 200 000 - 300 000; Full time

Job summary

A technology consulting firm in Johannesburg seeks an experienced IT Administrator to oversee installation, configuration, and maintenance of IT systems. Responsibilities include managing cloud and on-premises infrastructure, ensuring security and availability, and leading a team of junior administrators. Candidates should have a degree in IT and at least 5 years of relevant experience. Strong knowledge of cloud services, server management, and networking is required. The company promotes a diverse and inclusive workplace.

Qualifications

• 5+ years of experience in system administration with expertise in network infrastructure.
• Strong knowledge of virtualization technologies and cloud services.
• Ability to manage multiple tasks and projects simultaneously.

Responsibilities

• Manage and maintain Windows, Active Directory, Linux, and virtual servers.
• Configure and monitor firewalls and network infrastructure.
• Oversee the operation of cloud services and implement best practices.

Skills

Windows server environments

Networking knowledge (TCP/IP, DNS, DHCP, VPN, VLANs)

Proficiency in scripting languages (e.g., PowerShell, Bash)

Experience with cloud platforms (Azure)

Excellent problem-solving skills

Education

IT Diploma or Bachelor's Degree

MCSE or equivalent

CCNA

N+, A+

Tools

Hyper-V

Data Dog

Veeam Back-up and Replication

KASPERSKY

GLPI Helpdesk

Microsoft Active Directory

Job description

Position Overview

The IT Administrator will oversee the installation, configuration, maintenance, and reliable operation of computer systems, servers, and network infrastructure. This role is responsible for managing both on-premises and cloud-based systems while ensuring high availability and security of business applications. The Senior System Administrator will also collaborate with cross-functional teams, mentor junior administrators, and lead infrastructure improvement projects. The Sys Admin will work with service providers in resolving calls within the required timeframe.

Key Responsibilities

• System Administration : Manage and maintain Windows, Active Directory, Linux, and virtual servers (Hyper‑V), ensuring systems run smoothly with optimal performance.
• Network Management : Configure and monitor firewalls, VPNs, and network infrastructure to ensure secure and efficient data communication.
• Cloud Infrastructure : Oversee the operation of cloud services (Azure), implementing best practices for cloud architecture.
• Security Management : Implement security protocols and patches to ensure compliance with industry standards, responding proactively to emerging vulnerabilities.
• Backup & Recovery : Manage data backups, disaster recovery plans, and ensure data integrity through routine testing and verification.
• Monitoring & Performance Tuning : Use monitoring tools (e.g., Data Dog) to track system performance and resolve issues before they impact business operations.
• Documentation : Create and maintain comprehensive documentation related to systems, configurations, procedures, and troubleshooting.
• Mentorship & Training : Mentor junior system administrators, providing guidance and knowledge transfer to improve team performance and efficiency.
• Project Management : Lead infrastructure upgrade projects, system migrations, and continuous improvement initiatives.
• Compliance : Ensure all systems are compliant with regulatory requirements, company policies, and industry best practices (e.g., NIST & ISO).
• Troubleshooting : Provide advanced troubleshooting and support for complex issues, working closely with the IT support team and other departments.
• Penetration Tests and vulnerability assessments
• Back‑up and disaster recovery (Veeam Back‑up and Replication)
• Zimbra E‑Mail and Collaboration
• Microsoft Active Directory Domain Controllers
• Hyper‑V Virtualization
• Anti‑Virus System (KASPERSKY)
• Website editing and updates
• Server Rack Management
• Licensing
• Local Area Networks
• Management of existing Wide Area Network
• Cabling
• Ubiquiti Experience( Unifi, AirMax)
• Mikrotik
• VPN access and support
• VOIP
• CCTV
• Audio Visual Support
• Virtual platforms (Zoom, Teams etc.)
• GLPI Helpdesk
• Squid Proxy Server
• Fusion Inventory
• AD Audit Plus
• Microsoft Teams
• Firewalls

Qualifications

IT Diploma or Bachelors Degree

MCSE or equivalent

CCNA

N+, A+

Experience

At least 5+ years of experience in system administration with expertise in network infrastructure, server management, wireless networks and cloud services.

Technical Competencies

Proficiency in Windows server environments

Strong knowledge of virtualization technologies (Hyper‑V)

Experience with cloud platforms (Azure)

Networking knowledge (TCP / IP, DNS, DHCP, VPN, VLANs, firewalls)

Proficiency in scripting languages (e.g., PowerShell, Bash)

Knowledge of IT security standards and best practices (e.g., firewalls, intrusion detection, encryption)

Soft Skills

Excellent problem‑solving skills

Ability to manage multiple tasks and projects simultaneously

Strong communication skills, both verbal and written

Ability to work in a team‑oriented environment

High attention to detail and organizational skills

Employment Equity

GMI is an equal‑opportunity employer committed to fostering an inclusive and diverse work environment. In accordance with applicable labor and local laws, we do not discriminate on the basis of race, color, religion, gender, gender identity or expression, sexual orientation, age, national origin, ancestry, marital status, pregnancy, genetic information, physical or mental disability or any other protected characteristic under applicable law. Our hiring decisions are solely based on merit, qualifications, and the needs of the business. We are dedicated to ensuring a fair, reciprocal, and positive work experience for all employees, and we encourage applications from individuals with diverse backgrounds, perspectives, and abilities. We take our commitment to equal employment opportunity seriously and strive to create a respectful and inclusive work environment for all team members.

NB!!! CV FORMAT MUST BE PDF