Freelancer profile translated to English.
Back to original languageAbout Lionel
With a solid background in IT administration, I support companies in managing, optimizing, and securing their infrastructures. My role: to ensure the availability, performance, and security of network and system environments, while anticipating risks and ensuring business continuity.
My areas of expertise include:
Networks: configuration, VLAN segmentation, routing, firewalling, SD-WAN, enterprise Wi-Fi
Systems: Windows & Linux, Active Directory, virtualization (VMware, Hyper-V), backup management
Security: environment hardening, monitoring, access management, compliance (ISO, GDPR, ANSSI)
My goal: to provide companies with a high-performing, secure, and scalable infrastructure, adapted to their business challenges.
Available for one-off or long-term assignments, on-site or remote, I will be your trusted partner to strengthen your IT teams or successfully complete your strategic projects.
French
Native or bilingual
Can work on-site
Paris (up to 50km)
Experience
- LimagrainNetwork and Security AdministratorAGRICULTUREOctober 2024 - June 2025 (8 months)Clermont-Ferrand, France• Project for network filtering and segmentation across 230 global sites• Securing internet traffic for all devices• Reduction of broadcast domain and access filtering via VLAN segmentation• Traffic mapping, segregation, and blocking of unwanted traffic• Filtering via SD-WAN or Palo-Alto FW depending on site data criticality• VLAN, filtering, LAN and inter-VLAN routing on Meraki appliance• WAN connectivity via VeloCloud appliance• Zscaler nodes, dedicated SD-WAN Orchestrator• VLAN deployment on SD-WAN and micro-segmentation• Training of local IT teams• Inventory and sorting of on-site devices in the appropriate VLAN• Project for securing and automating sequencing data to dedicated GPFS• IP addressing plan, VLAN plan, traffic matrix• Script for automation and management of copies upon data availability
- Ministère des ArméesPalo Alto Network and Systems AdministratorDEFENSE AND MILITARYJuly 2022 - July 2024 (2 years)Maisons-Laffitte, France• Definition of a secure solution meeting ANSSI's PDIS requirements• Definition of an inter-zone traffic matrix according to ANSSI recommendations• Definition of network architecture and system configurations• Technical integration of the platform in LAB• Configuration of HPE Network Switches (Updates, Interfaces, VLANs, link aggregations, ...)• Configuration of infrastructure network services (NTP, DNS, DHCP, ...)• Installation and preparation of Palo Alto Networks Firewalls (Updates, management, administration, HA, ...)• Configuration of network interfaces (L3) and Palo Alto security zones (Service zones, DMZ, ...)• Creation and implementation of security policies (tags, inbound/outbound rules, NAT, App-ID, ...)• Optimization of the system and network infrastructure• Validation tests and documentation of configuration and policies with the Project Management Coordinator
- 1001 Vies HabitatSystems and Network AdministratorREAL ESTATEJuly 2021 - June 2022 (11 months)Paris, France• Configuration and update of Cisco routers within the End Client's lodges• Deployment of configurations via Console cable or remotely via SSH connection• Monitoring of MPLS to SD-WAN migration with internet operators• Monitoring and support for field support teams• Opening permissions on Palo-Alto Firewall (adding and modifying rules, address groups)• Creation of DHCP scopes and failover configuration• Administration of Cisco Meraki Dashboard Security & SD-WAN (Appliance Status, VPN Status)• Troubleshooting (Cisco switches, OSI model layers, incident tracking with internet operators)• Ticketing and Level 2 support• Remote control, switch control via Cisco Catalyst rebound
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Education
- BAC STI Electronic Engineering, Production OptionGustave Eiffel Scientific and Industrial High School – ENS Cachan (94)2001
- BTS in Management IT, Option Local Area Network Administrator - ARLEIFOPI - Paris 202010