Freelancer profile translated to English.
Back to original languageAbout Yannis
Hello and welcome! I am a freelance system and network architect, specializing in the management and optimization of IT infrastructures for companies.
My expertise in the field of information technology allows me to offer superior quality services in the design, installation, configuration, maintenance, and upgrade of computer networks. Whether for server management, IT security, virtualization, or the implementation of cloud solutions, I am able to meet your needs with confidence.
I have been passionate about IT for many years, and I am always at the forefront of the latest technologies and industry trends. My personalized approach, attention to detail, and professional rigor allow me to provide high-quality services to my clients.
If you are looking for a competent, reliable, and dedicated freelance system and network administrator, I am your man. Do not hesitate to contact me to learn more about my services and to discuss your IT management needs. I look forward to working with you and helping you achieve your IT goals.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km)
Experience
- IPSSICyber and Infrastructure InstructorEDUCATION AND E-LEARNINGJanuary 2026 - Today (7 months)Paris 12 Reuilly, FranceI teach students in Master's degrees in Cybersecurity and Cloud Computing. My teaching approach is based on my experience as an infrastructure architect, IT manager, and CTO consultant, to connect theoretical concepts to the operational realities of businesses.Topics taught:
- Low-level Development & Offensive Security: C programming, memory management, analysis and pedagogical design of malwares.
- Windows System Administration: Windows Server, Active Directory, GPO, RDS, WDS, identity management and environment hardening.
- Scripting & Automation: Bash, PowerShell, Python, Ansible and infrastructure automation.
- Networks & Architecture: Cisco/CCNA, routing, switching, VLANs, VPNs, network protocols and segmentation.
- Applied Cryptography: Symmetric and asymmetric encryption, PKI, certificates, digital signatures and key management.
- CI/CD & DevSecOps: Jenkins, Git, Ansible, deployment automation and security integration in pipelines.
- Reverse Engineering: Binary analysis with Ghidra and dnSpy, memory exploitation and CTF-type exercises.
- SOC & SIEM: Splunk, Wazuh, Suricata, Fail2ban, monitoring, event correlation and security indicators.
- Digital Forensics: Post-incident investigation, memory analysis with Volatility and exploitation of system artifacts.
- Hardening & System Security: Linux/Windows hardening, vulnerability management and attack surface reduction.
- Cloud & Infrastructure as Code: AWS, Azure, hybrid architectures, Terraform, CloudFormation and infrastructure automation.
- Governance & Resilience: BCP/DRP, risk management, GDPR compliance and cybersecurity best practices.
My teaching emphasizes practical work, technical labs, and real-world use cases to prepare students for the demands of the professional world. - Dalena & CoCTODIGITAL AND ITOctober 2023 - November 2025 (2 years and 1 month)Paris, France
- Definition and implementation of the technological strategy aligned with client needs.
- Management of technical teams, recruitment and talent development.
- Design of scalable and secure architectures, infrastructure optimization.
- IT security and compliance management (GDPR).
- Improvement of development processes (CI/CD, agile).
- Development and application of DRP strategies (BCP/DRP).
- Technological watch and adoption of new innovations (cloud, security, automation).
- RepossiChief Technical OfficerLUXURY GOODSJanuary 2022 - November 2025 (3 years and 10 months)Paris, FranceAssisted Repossi in transforming its on-premise infrastructure to Microsoft Azure, implementing a secure hybrid architecture (dev/prod) and completely modernizing the network and security foundation.Key achievements:Migration to Azure & Hybrid Architecture
- Design and deployment of the on-premise / Azure hybrid architecture (dev and prod environments)
- Implementation of secure interconnections between sites and the cloud (VPN, peering, routing)
- Participation in the high availability, DRP/backup, and scaling strategy
IT and Network Security- Definition and application of a Meraki SD-WAN security policy
- Network configuration and segmentation via VLAN to isolate different environments
- Strengthening of perimeter security on Fortigate firewalls (policies, filtering, NAT, VPN)
- Securing corporate Wi-Fi with RADIUS authentication (802.1X, access control)
Monitoring, Logging & Observability- Centralization of network and security logs (Meraki, Fortigate) in Splunk for SIEM use
- Setup of dashboards and alerts for proactive incident detection
- Monitoring of the park (workstations, mobiles, applications) via Workspace ONE
Governance, Best Practices & Support- Contribution to defining Cloud & Security best practices (standards, templates, naming, rules)
- Writing technical documentation and operational procedures
- Support for internal teams (run/support) and knowledge transfer
Stack & Environment:Azure, Azure hybrid, Meraki SD-WAN, VLAN, Fortigate, Corporate Wi-Fi, RADIUS, Splunk (SIEM), VMware Workspace ONE, Network & Cloud Security.
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Education
- Master Cloud & CybersecurityIPSSI20244e année Sécurité serveurs & Cyber défense Python Linux Panorama du Cloud English (Global Exam) Cryptographie Écriture d’un malware en Python La relation du droit avec le numérique RGPD théorie et application – Gouvernance et Sécurité data – DATA MAPPING, PIA Intégration et Sécurité des bases de données (PostgreSQL, MS SQL Server & MariaDB) PenTest, OWASP Architectures Cloud avec Microsoft Azure / Amazon AWS / Google Cloud Platform Systèmes de conteneurisation LXC et Docker Gestion des configurations et Infrastructure as Code avec Terraform Hardening système Amazon AWS : CI / CD et Automatisation des tâches avec Ansible et Jenkins Gestion de projet : Agile / Master Class SCRUM Projet annuel Challenge CTF, PenTest 5e année Ethical Hacking & Cybersécurité Ethical Hacking, PenTest et standard PTES Sécurité appliquée à l’IoT Base du langage C Écriture d’un malware en C Reverse Engineering / Détournement mémoire Majeure entrepreneuriale Intelligence économique – Veille stratégique Sécurité appliquée au Cloud Coordination des opérations de sécurités, conception et intégration d’un SoC et SIEM Amazon AWS : ECS et EKS Analyse Forensics Organisation de la sécurité (Schéma directeur, gestion de crise PCA/PRA, ATAWAD et BYOD) Réglementations et cadre normatif (ISO 2700x, PSSI, Standards industriels) Projet annuel / Challenge CTF, PenTest Mémoire de Recherche Soutenance Mémoire Préparation au TOEIC
- Bachelor's Degree in Systems and Network AdministrationUPEC2022
Certifications
- AWS CLOUD PRACTITIONER CLF-C02Amazon Web Services2025