Freelancer profile translated to English.

Description

Systems and network administrator at an MSP in the Paris region, I solve infrastructure problems for SMEs every day, sometimes in a project format (setting up a new firewall, migrating an email system), sometimes in an emergency (VPN not connecting, server crashing on a Friday evening). The common thread: solving problems, making sure things keep running.

I am a graduate engineer from CY TECH (formerly EISTI) with a specialization in cybersecurity. I had the opportunity to work with numerous technologies at Thalès as an automatic test tool developer, and now as a systems/networks and cybersecurity administrator. Specifically, I work with Sophos XGS (certified), OPNsense, Active Directory, Entra ID, Intune, Exchange Online, Hyper-V, Veeam, and 3CX. I script in PowerShell and Python when a repetitive task warrants automation.

On the cybersecurity side, I have both an offensive and defensive approach. Defensively, I manage SME environments daily: firewall hardening, EDR policies, MFA, backups, network segmentation. Offensively, I worked on AD pentesting in school (Kerberoasting, AS-REP Roasting, Pass-the-Ticket, DCSync, ACL and GPO abuse) and I am self-teaching web pentesting. This dual perspective helps me when I audit an infrastructure: I see what an attacker would try to exploit and what is reasonable to fix with an SME budget.

Recent projects:

An internal dashboard that centralizes alerts from our agent tool. As well as automation between our monitoring system and our ERP (ticket creation + automatic provisioning according to a preference algorithm).

Available for various missions: AD/M365 audits, infrastructure security audits, troubleshooting, automation, etc. If you have a specific problem and want a profile accustomed to finding solutions in complex environments, I am at your disposal.

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent
Chinese
Basic

Workplace preferences

Can work on-site

Cergy (up to 50km)

Add-On
Systems, Networks & Cybersecurity Administrator
CONSULTING AND AUDITS
January 2026 - Today (5 months)
Within an MSP managing end-to-end IT infrastructure for SME/ETI clients, I work across a broad scope covering cybersecurity, systems and network administration, as well as internal tool development.

Initiatives & Development
> Development of a dashboard with webhook integration for ticket management and communication with the internal ERP.
Deployment of Ansible for automating workstation preparation in the workshop (Windows updates, software installation/uninstallation, Office/Teams clean install).
Design of a web application (PowerShell/PODE) interfaced with the Exchange API for OWA rule management.

Cybersecurity
> Administration of Sophos Firewall (log monitoring, MFA/TTL rules) and Sophos Endpoint (DLP policies: device blocking, webmail, data exfiltration) — 5 Sophos certifications obtained (3 Firewall, 2 Endpoint).
Configuration of OPNsense and pfSense (NAT/firewall rules, VPN, SFTP).
Implementation of Entra ID MFA with token management in Vaultwarden (self-hosted).
Active Directory audit (password policies, GPO, security).
Drafting of a cybersecurity compliance project (sectoral directive).
Monitoring and patching of vulnerabilities based on CERT advisories (e.g., Veeam).

Systems & Network Administration
> Intune deployments (Win32 packages, PowerShell detection rules). Setup and support for 3CX telephony. DNS management, server/NAS infrastructure review, hardware quotations. Complete client onboarding (AD, Microsoft 365, domain, drivers, printers). Direct client technical support (phone and on-site).

Cross-functional Project
> Implementation of a complete BI pipeline (Apache Hop, SQL, Metabase) for business data visualization.
Cybersecurity Network Administration System Administration
Thales
Apprenticeship in Automatic Test Tool Developer
September 2024 - September 2025 (1 year)
95520 Osny, France
• Development of numerous Python scripts for an automatic test tool project, this project primarily allowed me to work on my computer vision and software development skills.
• Three GUIs: video player, audio player, and configuration file creation interface offering highly customized functions.
• Development of PowerShell scripts to launch tasks on the domain, connect Python scripts, etc.
• Presentations of results to the managers of the company's various departments.
• Capture and replay of user inputs, implementation of a video comparator with OpenCV.
Python
M2M Factory
Developer Intern
June 2022 - August 2022 (2 months)
Vigny, France
• Working with surveillance camera APIs.
• Development of a Node.js server to receive information sent by cameras.
• Development of APIs with Strapi