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Guillaume LavernheGL

Guillaume Lavernhe

M365 & SharePoint System Administrator | Expert

€550/day
Maisons-Alfort, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Guillaume

System & Network Administrator with 8+ years of experience, specializing in Microsoft 365, SharePoint environments, and PowerShell automation.

I assist SMEs and Mid-to-Large enterprises with:
🔹 M365 / SharePoint Audit & Governance: permissions, external sharing, compliance, tenant cleanup

🔹 PowerShell Automation: AD administration scripts, M365, reporting, API integration (Microsoft Graph, NinjaOne, etc.)

🔹 IT Outsourcing & Infrastructure: Active Directory, ESXi, Windows Server, VPN, RMM

🔹 Internal Tool Development: PowerShell WinForms / GUI interfaces for IT teams

In parallel, I publish SORATECH (soratech.fr), a suite of Windows tools for M365/SharePoint administrators used by MSPs and IT departments. This means I understand the real pain points of the job — not just theory.

What you get by working with me:

✅ Clean, documented, maintainable deliverables

✅ Real PowerShell expertise (not Stack Overflow copy-paste)

✅ Direct communication.

✅ Code that your teams can take over
Available for one-off missions (audit, scripting, migration) or recurring ones. Remote or Île-de-France as needed.
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Maisons-Alfort (up to 50km)

Experience

  • Numérique Gagnant
    M365 & SharePoint System Administrator | PowerShell Expert
    TECH
    June 2023 - Today (3 years and 2 months)
    Maisons-Alfort, France
    Administration 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 RMM

    Microsoft 365 / Azure AD: tenant management, SharePoint Online, OneDrive, Teams, Exchange, compliance policies, Intune, Entra ID

    PowerShell 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 documentation

    Cross-functional projects: server migration, n8n + Microsoft Graph automation, large-scale SharePoint permission audit

    Stack: PowerShell 7, Microsoft Graph, PnP.PowerShell, NinjaOne API, n8n, Azure AD, ESXi, Active Directory.
    Powershell Microsoft Entra ID n8n Automation artificial intelligence
  • ITAK IT
    Administration and IT outsourcing of multi-client SME/Mid-to-Large environments
    February 2022 - June 2023 (1 year and 4 months)
    94200 Ivry-sur-Seine, France
    Client fleet management: Active Directory, GPO, DHCP/DNS, backups (Veeam), centralized antivirus

    Microsoft 365 Administration: Exchange Online, SharePoint, Teams, license management, MFA, security policies

    VMware ESXi / Hyper-V Virtualization: deployment, monitoring, snapshots, restoration

    Network: firewalls (Stormshield/Fortinet), site-to-site and remote VPN, VLANs, managed switches

    N2/N3 Support, escalations, procedure writing, ITGlue documentation
    On-call and on-site interventions for clients in Île-de-France
  • ACI Technology
    Maintenance and evolution of SME client infrastructures in outsourced IT
    February 2021 - January 2022 (11 months)
    La Garenne-Colombes, France
    Active Directory, Microsoft 365, Exchange (on-prem and Online) administration

    Deployment and maintenance of Windows Server 2016/2019, GPO, file services

    Backups and DR: Veeam Backup, integrity checks, restore tests

    LAN/WAN Network: switch configuration, firewalls, VPN, professional Wi-Fi

    Migration of mailboxes and data to Microsoft 365

    N2 user support, ticket processing, client documentation writing

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Education

  • Certified Technician
    NinjaOne
    Certified Technician
  • MSP
    MSP

Skill set

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