Xavier Lemaire

Infrastructure, network, and telecom architect, specializing in VoIP and operational cybersecurity. Over 40 years of IT practice, including over 30 years of professional experience, with two decades serving a VoIP operator (W3tel) where I manage the architecture, monitoring, and security of a multi-system network infrastructure. I handle concrete production issues: re-architecting poorly documented networks, BGP/pfSense/Juniper architecture, firewall/VPN security and access management, SIP/VoIP and RTP incident diagnostics, MySQL/MariaDB/MSSQL database operation, storage and virtualization architecture (VMware, TrueNAS, ZFS), operational task automation with Python and n8n, and integration of AI voice assistants into business workflows. I work with SMEs, telecom operators, and companies with technical debt, in France and from Spain where I am based, remotely or on-site depending on the mission. Contact me for an audit, a re-architecture, or security of critical infrastructure.