Senior Network and Systems Administrator

We are seeking an experienced and highly skilled Senior System and Network Administrator to oversee the planning, implementation, management, and support of our IT infrastructure. This role involves administering servers, networks, cloud services, security, and related systems to ensure high availability, performance, and security of business-critical services. The ideal candidate will serve as a technical leader, mentor junior team members, and collaborate with cross-functional teams to deliver efficient IT solutions

Key Responsibilities

System Administration

• Manage, configure, and maintain Windows/Linux servers, Active Directory, DNS, DHCP, Group Policies, and related services.
• Perform OS and application patching, upgrades, and regular maintenance.
• Monitor and optimise server performance, storage, and virtualisation environments (VMware/Hyper-V).

System Administration

• Manage, configure, and maintain Windows/Linux servers, Active Directory, DNS, DHCP, Group Policies, and related services.
• Perform OS and application patching, upgrades, and regular maintenance.
• Monitor and optimise server performance, storage, and virtualisation environments (VMware/Hyper-V).

Network Administration

• Design, implement, and manage LAN/WAN, VPNs, firewalls, routers, switches, and wireless solutions.
• Ensure reliable connectivity, network performance, and redundancy.
• Troubleshoot complex network issues and optimise configurations.

Cloud & Virtualization

• Administer cloud platforms (Azure/AWS/Google Cloud), including identity management, virtual machines, backup, and security.
• Manage hybrid environments integrating on-premises and cloud resources.

Security & Compliance

• Implement and monitor security measures such as firewalls, IDS/IPS, endpoint protection, and vulnerability management.
• Enforce security policies, access controls, and compliance with industry standards (ISO, ITIL, GDPR, etc.).
• Conduct regular system audits, risk assessments, and disaster recovery drills.

Backup & Recovery

• Develop and maintain backup strategies, disaster recovery, and business continuity plans.
• Ensure data integrity, recovery testing, and compliance with retention policies.

Collaboration & Support

• Provide 3rd-level support for escalated issues across systems and networks.
• Work with vendors and service providers for hardware, software, and support contracts.
• Mentor and guide junior administrators and support staff.

Education & Experience

• Bachelors degree in Information Technology, Computer Science, or related field (or equivalent experience).
• Total 10 years of experience.
• 7+ years of proven experience in system and network administration.
• Strong knowledge of Windows Server, Linux, Active Directory, Group Policy, Exchange/Office 365.
• Proficiency in networking protocols (TCP/IP, DNS, DHCP, VPN, VLAN, Routing, Switching).
• Experience with virtualisation technologies (VMware, Hyper-V).
• Knowledge of cloud platforms (Azure, AWS, or GCP).
• Strong understanding of IT security principles, firewalls, and intrusion prevention systems.
• Hands-on experience with monitoring tools (Nagios, SolarWinds, Zabbix, etc.).
• Scripting/automation skills (PowerShell, Bash, Python) preferred.

Relevant certifications (CCNA/CCNP, MCSE, VCP, Azure/AWS Certified, Security+) are a plus.