Freelancer profile translated to English.
Back to original languageAbout Guillaume
You have a clear business vision but your tech projects are dragging, going off the rails, or your vendors are disappearing mid-project?
I build tailor-made digital + AI ecosystems that genuinely save your teams time and money.
15 years of experience, 30+ projects delivered, 0 empty promises.
I'm the right person:
- CTO of Gymlib from v1 (sold for €50M to eGym, then raised €200M)
- €200K warehouse management platform for Homeperf, 40 branches, acquired by Sapio Group
- Cylande mobile POS app deployed at IKEA, Castorama, Leroy Merlin (contributed to acquisition by Cegid)
- Donation platform for Obole Digitale: €2M raised, 12,500 downloads
- Automated platform for Cliple: 10 hrs/week saved per project manager
- 15 years coding .NET, Azure, React — 30+ projects without a hitch
- OpenClassrooms Mentor: 300+ students coached over 2,500 hrs
What I can do for you:
- Complete technical audit of an existing project (free during the first exchange)
- Architecture & build of a digital ecosystem from scratch (web + mobile + API + cloud)
- Integration of custom AI agents into your business processes (n8n, OpenAI, Claude, Make & Zapier automations)
- Taking over a project abandoned by a vendor (the famous "rescue mission")
- Fractional CTO: tech roadmap, recruitment, code review, team management
- Cloud migration & legacy modernization (.NET, Azure, MAUI, React)
Stack I master daily:
.NET / C# · ASP.NET · Azure (SQL, Blob, Service Bus, DevOps) ·React · MAUI · Blazor · SharePoint · n8n · OpenAI · Claude · Make · Zapier
Contact me now to discuss your needs.
PS: If you've had a vendor disappear on you, let's talk about it first. It's 50% of my work and I know exactly how to get a project back on track.
English
Fluent
French
Native or bilingual
Spanish
Basic
Portuguese
Basic
Thai
Basic
Remote only
Primarily works remotely
Experience
- TIMAAAssociate and C# / ASP.NET ExpertHUMAN RESOURCESSeptember 2021 - Today (4 years and 8 months)Nantes, FranceTimaa allows you to find the perfect assistant and office manager for your company.- Development of a platform connecting companies with freelance virtual assistants.
- EpsonASP.Net ExpertTELECOMMUNICATIONSJune 2020 - Today (6 years)Levallois-Perret, France- Development of an application for large corporations for ordering consumables (cartridges/paper) and managing their printer fleet (repair requests, changes, orders...)
- ARPILABE Services
On Malt
ASP.NET ExpertMEDICALOctober 2018 - Today (7 years and 8 months)Boulogne-Billancourt- Development of a legal and financial application to list all of Arpilabe's and its subsidiaries' holdings in partner pharmacies. Also to list all financial transactions within establishments linked to the group.- Development of a web-crawling application to retrieve information on pharmacists, pharmacies, and drugstores in France.- Writing functional specifications for a cash register and safe management application for pharmacies.- Support for a technology change for the arrival of a new team.
Reviews
Laurent
TIMAA
Reviewed on 9/9/2021
We are delighted to have called on Guillaume to support the IT team in the development of our new platform. Beyond his IT expertise, Guillaume also has a keen understanding of the business, which allows him to interact with all departments of the company and thus have a global vision of the project. I recommend him without hesitation.
AD
Account deleted
Reviewed on 10/17/2018
Guillaume has responded quickly and effectively to all our exchanges, perfectly meeting our expectations and even helping us make better decisions for the project's progress.
Recommendations
LB
+2
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Education
- Software Architect and Application Developer EngineerETNA Alternance2014
- Management Information Systems BTS (Associate's Degree)EPSI2011
Certifications
- MCTS: Microsoft .NET Framework 4, Windows ApplicationsDemos2010