Freelancer profile translated to English.

Description

My name is Nathan Guerin, currently working at the General Directorate for Armament (DGA), and a specialist in systems and network administration.

I help companies implement reliable, tested, and documented IT services. My goal is to save you time and secure your deployments through approved solutions and clear, complete, and directly usable technical documentation.

Specifically, I can help you with:

Implementing and testing newIT services

*Designing and configuringvirtualized environments and virtual networks

Writing comprehensivetechnical documentation (DAT, DET)(installation, configuration, operation)
Performingtechnical comparisonsbetween several solutions to help you choose the one that best meets your needs
Before any documentation is written, I reproduce and test the solution in a virtualized environment, taking your constraints into account. This ensures reliable, reproducible procedures adapted to your infrastructure.

Once the tests are validated, you will receive:

Variousstructured technical documentations(prerequisites, installation, configuration, best practices)
A document presenting the advantages and limitations of the solution
Ready-to-use virtual machines (VMs) to facilitate and accelerate deployment

I can also virtualize your IT network to simulate the target infrastructure and validate different solutions before they go into production.

Feel free to contact me to discuss your needs and get a quote.

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent

Workplace preferences

Remote only

Primarily works remotely

DGA MI
System and Network Administrator
TECH
September 2025 - Today (9 months)
Bruz, France
Main responsibilities:
Install, configure, and administer servers (Linux/Windows) and network equipment.
Monitor system operation and ensure their availability.
Manage user accounts, access rights, and security policies.
Implement backup, virtualization, and monitoring solutions.
Diagnose and resolve technical incidents.
Perform updates, security patches, and performance optimization.
Participate in the deployment of new services and infrastructures.
Write and maintain technical documentation.
Advise teams on best practices and IT infrastructure evolution.
Creation of automation scripts
Technical Documentation Writing IT Security Network Administration System Administration Virtualization: VMware, Hyper-V, Proxmox, VirtualBox, Gns3
Préfecture SGCD 35
System and Network Administrator
TECH
January 2024 - April 2025 (1 year and 3 months)
Rennes, France
Main responsibilities:
Configuration and administration of network infrastructures.
Deployment and management of an Alcazar captive portal for user access control.
Implementation of web and network filtering solutions for connection security.
Management of data, access rights, and authentication policies.
Administration and security of network services.
Writing technical documentation (installation, configuration, and operation procedures).
Operational support and maintenance of network services.
GDPR Network Configuration Technical Documentation Project Management Incident Management
DYNAMIPS PACÉ
Intern System and Network Administrator
TECH
March 2023 - June 2023 (3 months)
Pacé, France
Main responsibilities:
Configuration and setup of firewalls to ensure security and control network traffic.
Installation, configuration, and maintenance of servers and workstations.
Administration and management of Windows Server environments.
Creation, management, and deletion of user accounts in Active Directory (AD).
Management of access rights, security groups, and user policies.
Performing preventive site visits to external locations for the inspection and maintenance of IT infrastructures.
Diagnosis, analysis, and resolution of hardware and software incidents.
Technical support and user assistance (remote and on-site).
Migration of Gmail email services to Microsoft 365 (M365).
Configuration of email accounts, Outlook clients, and Microsoft 365 services.
Verification and optimization of the proper functioning of IT equipment.
Participation in maintaining the IT infrastructure in operational condition.
Network Administration System Administration Data Migration IT Support IT Security