Senior Unix Systems Administrator

About the role

Vanilla Networks is seeking a Senior Unix Systems Administrator to join its Cape Town team. You will be responsible for the operation, security and performance of FreeBSD and Linux servers that power the ISP’s core services.

Key responsibilities

• Install, configure, patch and tune FreeBSD and Linux servers.
• Monitor system health, ensure high‑availability and optimise performance.
• Manage backups, disaster‑recovery procedures and security controls such as firewalls and access policies.
• Diagnose and resolve complex technical incidents in a production environment.
• Provide advanced support to internal teams and collaborate with network engineers.
• Document systems, procedures and contribute to infrastructure design improvements.

Required profile

• 10+ years of Unix/Linux system administration experience.
• Proven ability to work in high‑availability, production environments.
• Strong troubleshooting and technical support skills.
• Relevant technical certification or equivalent practical experience.
• Methodical work style with clear documentation and teamwork orientation.

Required skills

• FreeBSD and Linux operating systems.
• System monitoring, performance tuning and backup management.
• Networking fundamentals: TCP/IP, DNS, DHCP, routing and firewalls.
• Scripting and automation: Bash, Python and configuration‑management tools.
• Virtualisation, containers and cloud/hybrid infrastructure concepts.