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SYSTEM ADMINISTRATOR
OS Labs Limited
Nairobi 🇰🇪 Kenya
Posted about 4 hours ago (22 Oct 2026) Updated about 4 hours ago
How to Apply
Submit an updated CV highlighting your system administration, network management and security experience.
Job Description
The System Administrator will manage OS Labs Limited’s IT infrastructure, ensuring the reliability, security and performance of servers, networks and user environments. Key duties include administering Windows Active Directory, Microsoft 365 services, FortiGate firewalls and end‑user computing devices. The role requires strong problem‑solving abilities and a proactive approach to IT security.
Qualifications & Requirements
- • Bachelor’s Degree in Information Technology, Computer Science, Computer Engineering or related field
- • 3–4 years of experience in system administration and IT infrastructure management
- • Hands‑on experience managing Windows Server and Active Directory
- • Proficiency in Microsoft Office 365 administration
- • Experience administering FortiGate firewalls
- • Strong knowledge of networking, switching, TCP/IP, DNS, DHCP and VPN technologies
- • Experience in end‑user computing support and IT asset management
- • Good understanding of IT security principles, vulnerability management and data protection
Required Skills
Responsibilities
- • Administer and maintain Windows servers and Active Directory environments
- • Manage user accounts, groups, access permissions and Group Policies
- • Monitor server performance, troubleshoot issues and ensure system availability
- • Perform regular updates, backups and recovery procedures
- • Manage Microsoft 365 user accounts, licenses, mailboxes and access permissions
- • Administer Exchange Online, Teams, SharePoint and OneDrive
- • Troubleshoot Microsoft 365 related issues and implement security settings
- • Configure, manage and monitor FortiGate firewalls, VPNs and network security rules
- • Monitor firewall logs, investigate security threats and resolve connectivity issues
- • Configure and maintain network devices, switches, routers and wireless access points
- • Manage VLANs, IP addressing, DHCP, DNS and routing configurations
- • Provide technical support for desktops, laptops, printers and other IT equipment
- • Install, configure, update and maintain operating systems and business applications
- • Diagnose and resolve hardware, software and user access problems
- • Maintain accurate IT asset and support records
- • Implement and maintain IT security policies, procedures and access controls
- • Monitor systems and networks for vulnerabilities and incidents
- • Ensure regular patching, antivirus protection, endpoint security and data backups
- • Support security audits, incident response and business continuity initiatives
- • Promote IT security awareness and compliance across the organization