We are hiring a Senior System Administrator. Key responsibilities include installing, configuring, and maintaining Windows and/or Linux servers; managing and supporting Active Directory, Group Policies, DNS, DHCP, and file services; monitoring server performance, system availability, and network health; performing regular system backups and recovery testing; managing virtualization platforms such as VMware or Hyper-V; configuring and maintaining network devices including switches, firewalls, and wireless access points; implementing and maintaining cybersecurity measures including antivirus, patch management, and security policies; troubleshooting hardware, software, network, and system-related issues; managing user accounts, permissions, and access controls; documenting system configurations, procedures, and IT assets; coordinating with vendors and service providers for support and maintenance; managing and supporting biometric and access control systems including fingerprint devices; managing and maintaining CCTV surveillance systems including NVR/DVR devices. Required qualifications include a Bachelor's degree in computer science, Information Technology, or a related field; 3-5+ years of experience in system administration; strong knowledge of Windows Server environments and Active Directory; experience with virtualization technologies; understanding of networking concepts including TCP/IP, VLANs, VPNs, DNS, and firewalls; experience with backup and disaster recovery solutions; strong troubleshooting and problem-solving skills; excellent communication and documentation abilities; good command of English language (written and spoken) is mandatory.