Freelancer profile translated to English.
Back to original languageAbout Thierry
You manage an infrastructure that must hold up: critical legacy or new AI agent stack, without incident, without compromise.
In France, a data breach costs an average of €3.59 million (IBM, 2025).
When AI is involved, the bill climbs to $4.63 million, $670,000 more than a standard incident (IBM, 2025).
AI agent infrastructures are no longer experimental. They are becoming real targets for compromise, particularly through attacks targeting the software supply chain of LLM components. This is not speculative. These are documented incidents.
I am a systems engineer, with 10 years of experience in system administration and IT support, including 8 years on critical infrastructures within the Ministry of Defence, where unavailability is never a theoretical option. Since 2024, I have been applying this same rigor to a new field: securing AI agents, with HILLAA (Hardening and Isolation Layer for Local AI Agents), my open-source hardening architecture (zero-trust, isolation, secrets management). Building local AI agents without execution control means accepting not mastering the system.
I intervene in particular on:
auditing and security analysis of existing infrastructures,
design of resilient and secure architectures,
isolation of components, secrets management, and access control,
support for the deployment of secure local AI agents,
design and development of secure MCP servers,
evaluation of risks related to software dependencies and AI supply chains.
Available for your classic infrastructure or AI agent security missions. Together, let's build the future of your systems. Let's discuss possible architectures, isolation models, and approaches that will make these systems truly safe in production.
English
Fluent
Can work on-site
Cergy (up to 30km)
Experience
- OPEN GroupSystem EngineerCONSULTING AND AUDITSJanuary 2025 - March 2025 (2 months)92300 Levallois-Perret, FranceDesign and lead a practical workshop on enterprise system monitoring, including demonstrations and role-playing for the teams.
- Ministère de la DéfenseSystem EngineerDEFENSE AND MILITARYSeptember 2022 - January 2025 (2 years and 4 months)Maisons-Laffitte, FranceOperation and Operational Maintenance of a critical system, analysis and remediation of system and network incidents. Management of the backlog and tracking of operational tickets. Integration and administration of an MECM platform for upskilling technicians. Design and deployment of scripting tools for log anonymization. Automation of backups and synchronization of KeePass databases on LAN. Implementation of an operational documentation base to centralize procedures.
- Ministère de la Défense Maisons-LaffitteNOC System Administrator (RDP)DEFENSE AND MILITARYDecember 2019 - September 2022 (2 years and 9 months)Administration, account and internal tool management. Installation, configuration, and maintenance of servers and client workstations. Analysis and resolution of Level 2 system incidents. Updating and managing technical documentation. Training employees. Maintenance and updating of application tools (ticketing, patch deployment). Renewal and updating of IT equipment and network devices. Integration of servers at remote sites and configuration of associated services. Deployment and evolution of routing and filtering rules (e.g., Splunk, firewalls).
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Education
- RNCP | Higher Technician in Computer Networks and TelecommunicationsCefiac Sarcelles2014RNCP | Technicien Supérieur Réseau Informatique et Télécommunication
- Linux Server, Windows Server 2008 R2, Cisco CCNALinux Server, Windows Server 2008 R2, Cisco CCNA