Andres D.

Enterprise-grade System Administration, Network Infrastructure management, and Infrastructure Migration specialist with over 20 years of hands-on IT experience. Delivering robust, high-availability, and fully optimized Linux and Windows Server environments with zero unscheduled downtime. Core Services & Expertise - Linux System Administration: RedHat, Ubuntu, CentOS, SUSE, and Debian. Kernel tuning, Bash shell scripting, automated backups, system hardening, SELinux, and firewalls. - Windows Server & Active Directory: Windows Server (2012–2022), Active Directory (AD DS), Group Policy (GPO), DNS, DHCP, IIS, and Entra ID (Azure AD) user synchronization & access management. - Virtualization & Cloud: VMware vSphere, ESXi, vCenter administration, vMotion, Hyper-V, and Azure VM deployment. P2V (Physical to Virtual), V2V, and V2P server migrations. - Microsoft 365 & Exchange: Admin Center management, user provisioning, security policies, role-based access control (RBAC), and license management. - Storage & Database Administration: Network Attached Storage (NAS), Dell EMC Isilon, SMB/NFS share configuration, MS SQL Server, and MySQL installation, tuning, and maintenance. - L2/L3 IT Support & Remote Hands: High-priority incident resolution, Helpdesk management, Cisco router deployment, videoconferencing systems setup, and technical documentation. Available for ongoing server maintenance, infrastructure automation, complex cloud or virtual machine migrations, and emergency troubleshooting. 👉 Send me a message to discuss your system administration needs or project scope.