Freelancer profile translated to English.
Back to original languageAbout Raphaël
Senior engineer and Microsoft 365 & identity cybersecurity expert, I leverage 12 years of IT experience to assist CISOs and CISOs who want to secure their Microsoft environment without hindering their teams.
My playground: Active Directory, Entra ID, Microsoft Defender XDR (MDI, MDO, MDE, MDA), Conditional Access, PIM, ADFS, PKI. My last role: security & identity referent for a media group of 3,500 users, with an ANSSI maturity level increase from 1 to 5 during that period.
What I can concretely help you with:
- Hardening Active Directory and implementing the tiering model (Harden AD, authentication silos, privileged accounts)
- Microsoft 365 cross-tenant migrations in M&A contexts (up to 3,500 users)
- Microsoft 365 security: Defender XDR, Conditional Access, PIM, identity governance
- Multi-forest identity convergence (trusts, synchronization)
- AD audits (PingCastle, Oradad), post-pentest remediation plans
- Secure administration architecture: Yubikey MFA, bastion, password vault
Certified Microsoft SC-100 (Cybersecurity Architect Expert) and SC-300 (Identity and Access Administrator) in 2026.
I undertake missions of 4 to 12 months, in hybrid mode between remote work and on-site in the Île-de-France region.
French
Native or bilingual
English
Fluent
Can work on-site
Issy-les-Moulineaux (up to 50km)
Experience
- RMC BFMSenior Engineer - Microsoft Security & IdentitiesFILM AND AVApril 2019 - Today (7 years and 2 months)Paris, FranceRole of referent security & identities engineer within the IT department of a media group with 3,500 users (hybrid Active Directory + Microsoft 365 environment, multi-entity).Key achievements:- Led the ANSSI maturity level increase from 1 to 5- Active Directory Tiering Model (Harden AD, authentication silos, privileged machines)- Secure administration architecture: Yubikey MFA, Teleport bastion, LockSelf vault- Microsoft 365 cross-tenant migrations in M&A context (up to 3,500 users)- Multi-forest identity convergence: domain trusts, account and password synchronization- AD redesign (tree, GPO, security groups), PKI redesign, ADFS and SSO deploymentMicrosoft 365 Security / Identity:- Defender XDR (MDI, MDO, MDE, MDA), Conditional Access, PIM, Microsoft Secure Score- Email security: DMARC, DKIM, SPF- Entra ID exploitation, Microsoft 365 tenant governance (Teams, Exchange Online, SharePoint Online)- AD audits via PingCastle and Oradad + post-pentest remediation plansInfrastructure & RUN:- Maintenance of identity infrastructures (AD, ADFS, PKI), security watch, version upgrades- PowerShell automation (HR sync, privileged account management)- Writing technical documentation and knowledge transfer
- OwentisMicrosoft Systems EngineerDecember 2017 - April 2019 (1 year and 4 months)Levallois-Perret, FranceAssignment within an IT consulting firm, environments Active Directory, Exchange, and Microsoft 365.Key achievements:- Migration and merger of multi-domain Active Directory- Complete Active Directory redesign (tree, GPO, security groups)- Migration from Exchange on-premise to Office 365- ADFS deployment and SSO federation- Deployment of an HPC infrastructure on Azure- Deployment of a Skype for Business 2015 infrastructureAutomation:- PowerShell scripting, script signing via PKIWriting technical documentation.
- LOCARCHIVESSystems Administrator / Operations AnalystMay 2016 - November 2017 (1 year and 6 months)Administration of Microsoft infrastructures (Active Directory, Exchange, Office 365) then evolved to an operations analyst role (administrator coordination, level 3 support).Main activities:- Active Directory, Exchange, Office 365 administration- Level 2/3 user support- VMware virtualization- Deployment of the Centreon supervision infrastructure- Installation, migration, and configuration of Windows servers- Backup management (Netvault)- PowerShell automation for Exchange and Office 365 administration- Writing technical procedures
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Education
- Master of Science (MSc) - Computer ScienceSUPINFO International University2018
- Professional Bachelor's Degree - Administration and Security of Corporate NetworksUVSQ - University of Versailles Saint-Quentin-en-Yvelines2016
Certifications
- Microsoft Certified: Cybersecurity Architect Expert (SC-100)Microsoft2026
- Microsoft Certified: Identity and Access Administrator Associate (SC-300)Microsoft2026