Freelancer profile translated to English.
Back to original languageAbout Olivier
I offer my services as a Systems and Network Engineer, with 12 years of experience in the field, primarily working independently, for missions ranging from a few moments to several months, mainly for companies with 0 to 300 employees.
The list of missions below is not exhaustive; you can find my complete resume and more information on my website: olivier-raulin.fr (copy and paste into your address bar :)
In summary, my skills are mainly focused on systems infrastructure, based on free software:
- Architecture and management of server infrastructures, on-demand or under outsourcing agreements,
- High availability / failover / redundancy,
- Infrastructure rationalization and refactoring (💸 savings!),
- Virtualization (e.g., with Proxmox),
- Task automation,
- Data and service sovereignty,
- Migration to or from the cloud,
- Consulting and audits,
- Security ...
If retaining or regaining control over your Information System is a concern that interests you, do not hesitate to contact me.
📶 I also have good knowledge in the management and security of corporate networks (routing, switching, VLANs, etc.)
👨💻 I can also read code in many languages, and even write some (Bash, Python mainly, but also JS, PHP...), but I am not a developer!
👨🔧 More generally, my broad scope of skills allows me to pragmatically diagnose many technical issues and often provide a concrete and realistic solution.
I prefer short and/or part-time missions (almost exclusively remote), but I am capable of deviating from these preferences occasionally (on-site up to 20% in Paris possible).
📨 Feel free to contact me for your infrastructure needs, hosted on physical or virtual servers, on-premises or elsewhere.
English
Native or bilingual
Spanish
Basic
Can work on-site
Le Mans (up to 50km), Paris (up to 10km), Angers (up to 10km), Tours (up to 10km), Rennes (up to 10km)
Experience
- IndépendantAll my other experiences are on my websiteApril 2020 - Today (6 years and 4 months)To view all my experiences and learn more about me, visit: olivier-raulin.fr
- PRELIGENS
On Malt
Systems and Network Engineering / ArchitectureSOFTWARE PUBLISHINGMarch 2021 - June 2022 (1 year and 3 months)Paris, FranceParticipation in the IT service's operationsProject to regain control of the company's data, using self-hosted free software.Automation, high availability... - SysdreamSystems and Network EngineerDIGITAL AND ITJanuary 2018 - April 2020 (2 years and 2 months)Levallois-Perret, FranceSysdream is an IT security services company, primarily offering audit (pentest) and offensive security training services.I was hired to manage the company's IT department.I was the sole person in this role, working completely independently.Specifically, I managed:- Physical servers / hypervisors- Virtual machines (around sixty) and a few containers (Docker)- Proposing, implementing, and maintaining internal services- Rationalizing and renewing equipment- Procuring and stocking machines, equipment, and IT consumables- User support (preparing machines, installing software, troubleshooting...)Major projects:- Automating the installation of workstations (PASSI context) for audits and report writing- Automating the installation of training workstations (complete reinstallation at the end of each training session) under Ubuntu- Complete renewal of the aging technical infrastructure (hardware, hypervisors, switches, routers): full autonomy on this projectKeywords: Support, IT, Proxmox, Debian, Gitlab, Ansible, VoIP, Zimbra, XiVO, Supermicro, ...
Reviews
Thierry
Ingénieur Devops - ITS INTEGRA
Reviewed on 7/9/2026
We had the pleasure of collaborating with Olivier and wish to highlight the quality of his work. His technical expertise was of great help to us, particularly on Linux subjects, but also on identity management and the construction of a hardened Linux workstation. His broad and solid range of skills allowed him to intervene relevantly on all the issues encountered.
Beyond the technical aspect, the collaboration was very pleasant. Olivier proved to be serious, professional, and fully invested throughout the mission.
We highly recommend Olivier and would gladly repeat the experience.
M
Matthieu
PRELIGENS
Reviewed on 6/3/2022
Olivier is a multi-talented IT professional: quick to understand client challenges, adept at proposing relevant solutions and implementing them rapidly. Dedicated to meeting the initially expressed needs, Olivier is particularly skilled at anticipating those that will arise during the life of services once they are in production. He thus ensures they are maintained functional over time, developing daily tools as needed to enable teams with more diverse skills to manage them sustainably. This realism holds real added value in my eyes.
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Education
- Expert in Information Technology and Information Systems (Bac+5 - Level I)EPSI Nantes2013Cycle d'ingénierie en informatique généraliste (développement, systèmes et réseaux) Spécialisation en systèmes / réseaux en dernière année.
- DUT in Computer Science (Bac+2)University of Nantes2010DUT Informatique avec option de gestion d'entreprise. Formation orientée principalement développement, mais avec des composantes généralistes (mathématiques, communication, économie, etc.)