Zaheer M.

Enterprise Systems & Network Architect | 12+ Years Enterprise Experience High-stakes infrastructure requires zero-downtime execution and airtight security. I help mid-sized businesses, datacenters, and enterprise teams design, secure, and migrate critical hybrid environments without unexpected outages or security backdoors. Whether you need emergency server recovery, complex firewall architecture, cloud migration, or enterprise Office 365 tenant setup, I deliver reliable, enterprise-grade engineering. Core Specializations & Tested Deliverables: 1. Network Security & Firewall Engineering Deployment, policy auditing, and hardening for Fortinet (FortiGate), Sophos (XG/UTM), SonicWall, and pfSense. Firewall migration (e.g., SonicWall to pfSense, Sophos deployment, and router isolation). Site-to-Site VPNs (IPsec/GRE), SSL VPN, FortiClient, and OpenVPN remote access with RADIUS/MFA. Layer 2/3 network design, VLAN segmentation, ACLs, and UniFi enterprise deployment. 2. Server Virtualization & Cloud Systems (Azure, AWS, M365) Enterprise virtualization management: VMware ESXi performance tuning, crash recovery, Hyper-V, and Citrix Xen. Windows Server environment management: Active Directory migrations, Group Policy (GPO) security rules, DNS, DHCP, and IIS. Microsoft 365 tenant setup, Entra ID (Azure AD) sync, Exchange Online, and Azure VM hosting. Linux administration (Ubuntu, Debian, CentOS, Red Hat) for production web & database workloads. 3. Unified Communications & VoIP Administration Enterprise VoIP deployment: FreePBX, Asterisk, 3CX, and Grandstream HT813 integration. Asterisk PBX migrations, SIP trunking configuration, and web interface troubleshooting. Why Clients Hire Me: 100% Job Success Rate: 90+ completed enterprise contracts with zero tolerance for critical errors. Datacenter Background: Hands-on datacenter engineering experience ensuring physical and virtual reliability. Rapid Incident Response: Fast triage for down firewalls, broken VPNs, and unresponsive servers.