Senior System Administrator

6 months ago

Johannesburg, South Africa Level-Up Full time

**_Purpose of Job_**

Senior System Administrator will be responsible for ensuring the stability, security, and efficient operation of our company's IT infrastructure. This role requires strong technical knowledge of Linux and Windows administration, networking, and proficiency in managing hypervisors such as VMware or Hyper-V and Proxmox, along with experience in managing Azure cloud environments.

**_ Key Responsibilities_**

1. Linux and Windows System Administration:

- Install, configure, and maintain Linux and Windows servers and workstations.
- Manage user accounts, permissions, and file systems on both platforms.
- Perform regular system monitoring, troubleshooting, and performance

tuning.
- Conduct security audits and implement necessary measures to protect

systems and data.
- Create and maintain system documentation, including configuration and

troubleshooting guides.

2. Azure Cloud Management:

- Deploy, configure, and manage virtual machines and other resources in Azure.
- Monitor cloud infrastructure for availability, performance, and security.
- Implement and manage virtual networks, subnets, and network security

groups.
- Develop and maintain Azure Resource Manager (ARM) templates for

infrastructure automation.
- Ensure proper backup, disaster recovery, and business continuity plans for

cloud-based systems.

3. Hypervisor Management:

- Install, configure, and maintain hypervisor platforms, preferably Proxmox.
- Manage virtual machines, templates, snapshots, and virtual networks.
- Optimize and monitor hypervisor performance and resource allocation.
- Implement and manage high availability and fault tolerance features.

4. Network Administration:

- Configure and maintain network devices, such as routers, switches, and

firewalls.
- Troubleshoot network connectivity issues and optimize network

performance.
- Implement and maintain VPN connections and remote access solutions.
- Monitor and manage network security, including intrusion detection and

prevention systems.

5. System Monitoring and Performance:

- Deploy and maintain monitoring tools for proactive system monitoring and

alerting.
- Analyse system performance data, identify bottlenecks, and optimize system

resources.
- Conduct capacity planning to ensure system scalability and meet business

requirements.

the infrastructure.

6. Documentation and Collaboration:

- Create and maintain technical documentation, including system

configurations, procedures, and troubleshooting guides.
- Collaborate with cross-functional teams to provide technical support and

solutions.
- Participate in on-call rotations and respond to system emergencies promptly.
- Stay up to date with industry trends, emerging technologies, and best

practices in system administration, cloud computing, and virtualization.
**_ Qualifications_**
- Bachelor’s degree in computer science, Information Technology, or a related field

(or equivalent work experience).
- Relevant certifications, such as Linux Professional Institute (LPIC), Microsoft

Certified: Azure Administrator Associate advantageous.
**_ Experience & Systems_**
- Minimum 8 years’ experience in an Enterprise IT environment
- Strong experience in Linux and Windows system administration, including

installation, configuration, and troubleshooting.
- Proficiency in managing Azure cloud services and resources, including VMs,

storage, networking, and security.
- Hands-on experience with hypervisor technologies such as VMware or Hyper-V

and Proxmox.
- Solid understanding of networking concepts and protocols (TCP/IP, DNS, DHCP,

VPN, etc.).
- Familiarity with scripting languages (e.g., Bash, PowerShell, Python) for

automation and infrastructure management.
- Experience with configuration management tools (e.g., Ansible, Puppet, Chef) is a

plus.
- Knowledge of containerization technologies (e.g., Docker, Kubernetes) is

desirable.
**_ Skills & Competencies (Personal & interpersonal)_**
- _Excellent problem-solving skills and the ability to work independently and in a _
- team environment._
- _Strong communication and interpersonal skills to effectively collaborate with _
- stakeholders at all levels._

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