Freelancer profile translated to English.
Back to original languageAbout Sebastien
Independent Systems & Network Administrator, 25 years of experience in SMEs. I assist your teams with L2/L3 support and Windows Server, Active Directory, and Microsoft 365 administration.
Specifically, I handle:
• Level 2 and 3 user support (complex incidents, escalations, workstations, permissions)
• Active Directory Administration: GPOs, accounts, security, directory cleanup
• Microsoft 365: Exchange Online, Teams, SharePoint, Intune, license management
• Windows Server: AD/DNS/DHCP roles, updates, monitoring
• Backup and security (3-2-1 rule, MFA, hardening)
Autonomous, reliable, accustomed to managing in an SME environment where you need to be able to do everything. Available for remote work, one-off or regular assignments. Quick response
French
Native or bilingual
Can work on-site
Voiron (up to 50km)
Experience
- Sincrone / AtralTechSystems & Network AdministratorJanuary 2026 - April 2026 (3 months)Crolles, FranceCloud Administration: Entra, Intune, Exchange, Teams, SharePoint. Infrastructure: VM creation and network management (patching, switch, VLAN, firewall). Support: Installation of IT lines and user support.
- AtralTechSystems & Network Administrator TechnicianOctober 2025 - December 2025 (2 months)Administration of client infrastructures (M365, AD). Local technical support and incident resolution.
- Koesio Managed ServicesSystems & Network AdministratorNovember 2024 - April 2025 (5 months)Saint-Martin-d'Hères, FranceManagement of AD, DNS, DFS, Hyper-V, and multi-site environments. Security: Acronis, WatchGuard backups and monitoring. Network: HPE Aruba segmentation.
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Education
- BTS Network and Telecommunications TechnicianAFPA1998BTS Technicien Réseau Informatique & Télécom
- BTS Industrial MaintenanceMFR de1997BTS Maintenance Industrielle