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 businesses.
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 setting up cloud solutions, I am able to meet your needs with confidence.
I have been passionate about IT for many years, and I always stay at the forefront of the latest technologies and industry trends. My personalized approach, attention to detail, and professional rigor enable 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
- Dalena & CoCIODIGITAL AND ITOctober 2023 - November 2025 (2 years and 1 month)Paris, France
- Definition and implementation of the technology 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 DR 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 their on-premise infrastructure to Microsoft Azure, implementing a secure hybrid architecture (dev/prod) and a complete modernization of the network & 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 high availability strategy, DRP / backups, and load scaling.
Securing IT & Network Assets- Definition and application of a Meraki SD-WAN security policy.
- Network configuration and segmentation using VLANs to isolate different environments.
- Strengthening of perimeter security on Fortigate firewalls (policies, filtering, NAT, VPN).
- Securing enterprise Wi-Fi with RADIUS authentication (802.1X, access control).
Monitoring, Logging & Observability- Centralization of network and security logs (Meraki, Fortigate) in Splunk for SIEM analysis.
- Setup of dashboards and alerting for proactive incident detection.
- Monitoring of assets (workstations, mobile devices, applications) via Workspace ONE.
Governance, Best Practices & Support- Contribution to the definition of 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, Enterprise Wi-Fi, RADIUS, Splunk (SIEM), VMware Workspace ONE, Network & Cloud Security. - Dalena & CoSystem and Network AdministratorDIGITAL AND ITOctober 2021 - October 2023 (1 year and 11 months)Paris, FranceAs a system and network administrator at Dalena, I managed and configured the IT infrastructure, ensured IT security, resolved complex technical problems, and collaborated effectively with team members and clients. I made a significant contribution to the efficiency of the company's IT infrastructure while minimizing costs.
- Management of Azure AD hybrid architecture.
- Management of Windows Server (AD, GPO, RDP, WDS).
- Virtualization with Proxmox and ESXI.
- Networking (Meraki/Unifi/Fortigate/Stormshield/Pfsense).
- Cable pulling, switchboard and camera installation.
- Implementation of high availability strategy.
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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