Yoann Blossier
Senior Solution Architect | .NET Fullstack
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Paris, France
Freelance
À distance uniquement
Expertises
Langues
À propos
Introduction
Solution Architect & .NET Fullstack Expert with 10+ years delivering enterprise-scale systems for major brands like Accor, Thales, and Louvre Hotels. Specialized in API development, CI/CD implementation, and complex system migrations with proven success reducing technical debt and automating processes. Currently leading EU regulatory compliance projects while architecting scalable solutions using .NET, Azure, and modern DevOps practices.
Expérience de travail
BruneauFreelance
févr. 2025 - Présent
1 an 9 mois
91140 Villebon-sur-Yvette, France
Scrum master
avr. 2025 - Présent
1 an 7 mois
91140 Villebon-sur-Yvette, France
Senior Developer .Net
févr. 2025 - Présent
1 an 9 mois
91140 Villebon-sur-Yvette, France
Project Poséidon - Document generation (Invoices, order confirmation, notes, ...) - Put in place the process of the EU Legal obligation to generate numeric invoices and send them to PEPPOL network according to each national rules (FR, BE, ES, IT, DE, PT, ..) - Improve the punchout order process to reduce the maintenance and increase the automation for new clients Project Electronic Invoicing - Apply the new European regulation policies about invoicing for Benelux
CEO
TOENN VAOTFreelance
janv. 2018 - Présent
8 ans 10 mois
91220 Brétigny-sur-Orge, France
Solution architect
ENTORIAFreelance
mars 2024 - mars 2025
1 an 1 mois
92300 Levallois-Perret, France
Following multiple merge of insurance companies, I participate to the complete transformation of the system. Software Architecture - Put in place the good practices for development (website, api, batch, sql) - Write project models - Design technical schemas and write technical guides for project solutions - Work with IT Team to normalize the infrastructure (servers, folders, workflows, ...) - Teach to reduce technical debt at all project levels (project managers, developers, IT team, partners) CI/CD - Improve the deployment of software - Reduce human errors on deployment - Remove write access to PRODUCTION systems Migration - Study the existing software, websites, API to write a transformation guide to reduce them - Move batch to Talend - Merge APIs - Add specialized APIs to remove high and strong dependencies to frameworks
ThalesFreelance
sept. 2018 - déc. 2023
5 ans 4 mois
91220 Brétigny-sur-Orge, France
Solution architect
avr. 2020 - déc. 2023
3 ans 9 mois
91220 Brétigny-sur-Orge, France
As part of the research and development of the ticketing solution, we have developed a mobile application allowing the dematerialization of transport cards ✓ Application in ReactNative ✓ Decorate the C++ ticketing layer with a RESTful API to make it accessible ✓ Integration of bluetooth beacons for terrestrial localization in addition to GPS ✓ Development of QR Code for prepaid trips
Technical lead
sept. 2018 - mai 2020
1 an 9 mois
91220 Brétigny-sur-Orge, France
In the refactoring of the public website CWS, I design a new architecture to reflect the new expectations of our customer and the new standards. I realize the design, the development and the maintenance of the public REST API for the customer' partners
Technical Lead
Louvre Hotels GroupFreelance
févr. 2017 - oct. 2018
1 an 9 mois
La Défense
Integrated within the API Team, I am in charge of the analysis, implementation and deployment of APIs that will be used by the group's applications (ERP, CRM, Intranet, ...) and the various partners (OTA, Metasearch, ...) In charge of carrying out the tests on the Hotel4You application for the introduction of the dematerialization of room keys, I was also led to develop the system for synchronizing data and actions between Opera and the middleware. After training in Sweden on the VisionLine tool and the AssaAbloy SDK, I am in charge of setting up the new architecture for the new version of the room key dematerialization module and the guest experience in the hotel. In charge of the development of a hotel management web application allowing pricing decision-making for REVENUE MANAGERS, I am also in charge of its maintenance and participate in the brainstorming of the future version. In advising on the technologies to be used in the projects and on the architecture, I put in place technical solutions and tools in order to allow a better use of the solutions and to achieve the business needs (statistics, logs, feedback, …)
.Net Senior Developer
IDEX
nov. 2016 - janv. 2017
3 mois
Région de Boulogne-Billancourt, France
In charge of the factoring services, I develop the Back-Office interfaces for the management of the factoring aspects. I also worked on the factoring algorithm linked to the bank interface. I refactored the web project to modernize by using new technologies : ASP.Net MVC 5, HTML5, LESS(CSS3), Bootstrap
Accor
avr. 2015 - oct. 2016
1 an 7 mois
92130 Issy-les-Moulineaux, France
.Net Senior Developer
juil. 2015 - oct. 2016
1 an 4 mois
92130 Issy-les-Moulineaux, France
Following the specifications of the new projet for AccorHotels.Jobs, I put in place a new database containing many standard data to complete existing ones. For that I use many international standard data as ISO 3166-1 (countries), 3166-1 (regions/states), 639-3 (languages) or also ISO 4217 (currencies). In the aim to allow a good integration in the new system, I'm designing the new database structure, preparing the migration plan, optimizing the storage and distribution of data and also configuration of the web server environment. I also realize some mini-projects to correct existing data to prepare the migration. Alone on the project, I used my experience to develop and put in place innovative solutions for authentication, search engines, translation and many other sensitive subject in a big project like this one.
.Net Senior Developer
avr. 2015 - juil. 2015
4 mois
92130 Issy-les-Moulineaux, France
Following the head decision to rename the firm in the aim to improve the brand identity, I applied the new graphic charter and brand name of the firm on AccorHotels.Jobs. To do that, I also should work on Photoshop to apply parts on website.
Formation
Université de Rennes I
Master 2, MIAGE
2007 - 2010
4 ans
Lycée Rabelais
BTS, Informatique et Gestion
2005 - 2007
3 ans
Lycée Chaptal
Baccalauréat, Electronique
2002 - 2005
4 ans
Licences et certifications
API Beginner
Délivré le : janv. 2025
C# Certification
Délivré le : janv. 2024
Microsoft Certified: Azure Fundamentals
Délivré le : mars 2023
Maîtrisez les bases de données NoSQL
Délivré le : mars 2020
Gérer votre temps efficacement
Délivré le : mars 2020
Créez des animations CSS modernes
Délivré le : mars 2020
Communiquez et formalisez vos idées par le storytelling
Délivré le : mars 2020
Augmentez votre trafic grâce au référencement naturel (SEO)
Délivré le : mars 2020
Adoptez les API REST pour vos projets web
Délivré le : mars 2020
MCSA: Web Applications - Certified 2016
Délivré le : août 2016
70-487: Developing Windows Azure and Web Services
Délivré le : mars 2013
70-480: Programming in HTML5 with JavaScript and CSS3
Délivré le : mars 2013
MCPS: Microsoft Certified Professional
Délivré le : févr. 2013
70-486: Developing ASP.NET MVC 4 Web Applications
Délivré le : févr. 2013