About Guillaume
French
Native or bilingual
English
Fluent
Experience
- Numérique GagnantM365 & SharePoint System Administrator | PowerShell ExpertTECHJune 2023 - Today (3 years and 2 months)Maisons-Alfort, FranceAdministration and automation of a multi-site Microsoft 365 environment (~1000 Windows workstations):Infrastructure: ESXi 7.0 (Windows Server VMs), Active Directory, SoftEther VPN (L2TP/IPSec), monitoring and deployment via NinjaOne RMMMicrosoft 365 / Azure AD: tenant management, SharePoint Online, OneDrive, Teams, Exchange, compliance policies, Intune, Entra IDPowerShell 7 Automation: SharePoint audit script development (permissions, long paths, 5000 threshold), versioning cleanup, email signature deployment, AD mapping via CSV, NinjaOne API integration (OAuth2)Security & Governance: GPO hardening (NTLM, Kerberos restrictions), hybrid identity management, ITGlue documentationCross-functional projects: server migration, n8n + Microsoft Graph automation, large-scale SharePoint permission auditStack: PowerShell 7, Microsoft Graph, PnP.PowerShell, NinjaOne API, n8n, Azure AD, ESXi, Active Directory.
- ITAK ITAdministration and IT outsourcing of multi-client SME/Mid-to-Large environmentsFebruary 2022 - June 2023 (1 year and 4 months)94200 Ivry-sur-Seine, FranceClient fleet management: Active Directory, GPO, DHCP/DNS, backups (Veeam), centralized antivirusMicrosoft 365 Administration: Exchange Online, SharePoint, Teams, license management, MFA, security policiesVMware ESXi / Hyper-V Virtualization: deployment, monitoring, snapshots, restorationNetwork: firewalls (Stormshield/Fortinet), site-to-site and remote VPN, VLANs, managed switchesN2/N3 Support, escalations, procedure writing, ITGlue documentationOn-call and on-site interventions for clients in Île-de-France
- ACI TechnologyMaintenance and evolution of SME client infrastructures in outsourced ITFebruary 2021 - January 2022 (11 months)La Garenne-Colombes, FranceActive Directory, Microsoft 365, Exchange (on-prem and Online) administrationDeployment and maintenance of Windows Server 2016/2019, GPO, file servicesBackups and DR: Veeam Backup, integrity checks, restore testsLAN/WAN Network: switch configuration, firewalls, VPN, professional Wi-FiMigration of mailboxes and data to Microsoft 365N2 user support, ticket processing, client documentation writing
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Education
- Certified TechnicianNinjaOneCertified Technician
- MSPMSP