Freelancer profile translated to English.
Back to original languageAbout Sébastien
With 18 years of experience in IT, I have worked in companies of various sizes and sectors, from IT service providers with 6 employees to large international groups (Véolia Environnement). I have honed my knowledge and skills across the entire IT infrastructure spectrum, from virtualization (VMWare, Proxmox, Hyper-V) to servers (Active Directory, Exchange / Plesk, Web, Mysql, etc.), workstations, networks (LAN / WAN), security (Firewall, vLAN, Passbolt (password manager), NTFS Permissions, awareness of best practices, etc.), VoIP (3CX, Avaya), and Cloud (AWS).
With a global IT vision, I have successfully managed all projects entrusted to me throughout my experiences, following a complete project management process, from needs assessment and writing specifications, to leading meetings with stakeholders, delivery, and training.
Curious and eager to offer the best solutions at the best costs for companies, I continuously explore solutions from major editors as well as the open-source world.
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- Median TechnologiesSystem and Security AdministratorMEDICALNovember 2023 - Today (2 years and 6 months)Sophia Antipolis, FranceRealization of a DLP POC- Encryption at rest of VMs- Sophos DLP
- ARCELOR MITTALSenior System AdministratorCIVIL ENGINEERINGApril 2023 - September 2023 (6 months)Fos-sur-Mer, France• Estimation of the migration cost of Linux servers installed on-premises to Azure cloud.• Detailed inventory and proposal of the new cloud target.• Execution of migration operations, testing, and validation.• Writing of all procedures.• Implementation of administration tools for this new architecture.• Transfer of skills to application maintenance teams.
- ViaSphèreGroup Infrastructure ManagerHUMAN RESOURCESJune 2019 - December 2022 (3 years and 6 months)Marseille, FranceReporting directly to the CIO, my role is to manage the entire infrastructure (system and network) for the group, across two headquarters (Marseille and Mulhouse) and all sites nationwide, as well as various service providers and contractors.- System: Administration of two ESX farms (vSphere 6.7) (comprising 40 Windows servers (AD DC / RDS / SQL) / 4 Linux Debian), a Proxmox farm, and also a private cloud on AWS (52 dev, pre-prod, and prod instances on Amazon Linux 2), plus an IT park of approximately 600 workstations distributed across agencies. Backup management under VEEAM.- Network: Stormshield Firewalls, connected via VPN IPsec + MPLS, LAN and VLAN management (Data + VoIP). Migration of network infrastructures to Alcatel.- Telephony:- Fixed: 3CX (4 servers) and its daily management with BERONET and BTIP gateways + SIP Trunk. Migration to an AWS VM to centralize the VoIP server with Orange BTIP SIP trunk certification (national first) with OBS technical teams.- Mobile: Smartphones (approximately 500 lines)- Implementation of GLPI and FusionInventory for park management, and Zabbix for monitoring (SNMP + agents) and TacticalRMM for the RMM part. Implementation of Passbolt.- Messaging: Migration from Exchange 2010 to Office 365 + Plesk
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Education
- Professional License, CASIR (Design and Administration of Network Information Systems)IUT 2 Pierre Mendès France2004Licence Professionnelle, C.A.S.I.R (Conception et Administration de Systèmes d'Informations en Réseaux)
- First Aid in Teams Level 1 and 2Croix Rouge Française2019Premiers Secours en Équipe niveau 1 et 2