Freelancer profile translated to English.
Back to original languageAbout David
Freelance Systems Engineer specializing in Microsoft environments and Active Directory security.
I assist companies in the operation, improvement, and security of their IT infrastructures. I work on both operational maintenance (MCO) missions and security evolution or remediation projects.
English
Fluent
French
Native or bilingual
Can work on-site
Lille (up to 50km)
Experience
- JEUMONT ELECTRICSystem/Security EngineerMECHANICAL ENGINEERINGJune 2024 - December 2025 (1 year and 6 months)Jeumont, FranceJEUMONT ELECTRIC - Cyber Team RunnerTasks:System Administration:
- Maintaining the operational status of a fleet of 200 to 250 servers
- Deploying new servers according to business needs
- L3 Support, critical incident management, and troubleshooting
- Analyzing, debugging, and resolving system incidents
- Restarting services, managing partitions, migrations, and deployments
Security & Network- Analyzing and correcting Forti flows
- Opening and managing flows on Fortigate and Stormshield
- Implementing SSO and MFA
- Managing SSL certificates
- Patching and managing antivirus (deployment, whitelisting, updates, incident resolution)
- Cybersecurity awareness training
Restricted Diffusion (DR - DGA standard) Network Project- Participation in setting up a secure Restricted Diffusion environment
- Implementing an Active Directory with a Tier Model
- Certificate authentication with YubiKey
- Deploying hardened VMs
- Network segmentation via DNS zones
- LAN/WAN isolation via dedicated NICs and bonds
- Creating security rules on Fortigate
- Collaboration with Thales Group and Framatome on the project
Functional Environment: FortiGate and Stormshield flow opening, PRTG monitoring and alerting, Incident management via GLPI, Fleet management,Technical Environment: Fortigate, vSphere, Microsoft Server, Debian, FortiManager, O365, Azure, OVH – Domain and DNS management, HornetSecurity, Varonis, Bitdefender, and SentinelOne management, - JULESSystem EngineerSOCIAL NETWORKSDecember 2023 - June 2024 (6 months)Roubaix, FranceJULES – System EngineerTasks:Firewalling (Fortigate)
- Flow opening
- Setting up VPN and FSSO accounts
- Packet and flow analysis
System- Setting up RADIUS server (NPS)
- Deploying and MCO (Update, Disk space management...) of VMs on VSphere
- Managing RDS collections
- MCO of Web services, on RedHat
- Participation in the infrastructure migration to DC
Functional Environment: Network flow opening, Firewall rules, Monitoring and alerting, Incident management, TroubleshootingTechnical Environment: Fortigate, vSphere, Microsoft Server, O365, Azure, ForcePoint Proxy, FortiManager, ManageEngine, PRTG, - DECATLON BTWIN VILLAGEL3 RUNNERE-COMMERCEMay 2023 - December 2023 (7 months)Lille, FranceDECATHLON – L3 RUNNERTasks:
- Analyze connectivity and security requirements for opening flows between GCP, AWS, and the WAN
- Frame requests via SMA-X ticketing, qualify impact, prioritize, and track incidents until resolution
- Design and apply filtering rules on Zscaler,
- Implement flow openings via Squid and automate actions via Rundeck
- Deploy and operate Meraki network configurations, create VLANs, open and delete sites and stores.
- Set up VPN accounts and integrate FSSO
- Monitor and investigate via SolarWinds, Grafana, and Splunk, analyze packets and logs, apply patching, manage antivirus, and document changes
Functional Environment: Network flow opening, VPN Management, Firewall rules, Monitoring and Alerting, Incident Management, PatchingTechnical Environment: Zscaler, Squid, Rundeck, Meraki, SolarWinds, Splunk, Grafana, Wallix WAB, Fortigate, VMware vSphere, Windows NPS
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Education
- MSI (Information Systems Management) Cyber OptionCESI Arras2021MSI (Management des systèmes d'informations) option Cyber
- RISR (Systems and Networks Engineering Manager)CESI Arras2019RISR (Responsable Ingénierie Systèmes et réseaux)