Freelancer profile translated to English.
Back to original languageAbout Etienne
Do you have a project for aweb application**, a **business toolto build, or aSaaSto launch, and are you looking for aweb developercapable ofrapidly transformingthis project into a concrete and usable product?
Full-stack**web developer** with10 years of experience**, I design and develop custom **web applications**, primarily with **.NET/C#for the backend, andVue.js/TypeScriptfor the frontend. I am involved in the entire product lifecycle: technical design, development, deployment, and continuous improvement.
My areas of intervention:
- .NET/C# web backend development (REST API)
- Vue.js/TypeScript web frontend development
- Business web applications
- Custom internal tools
- SaaS platform
- Takeover and refactoring of existing web applications
I have worked on different types of projects:MVP creationforstartups**, development of **business web applicationsforSMEs**, or **development of complete SaaS platformsfor **large groups like FLOA (BNP Subsidiary)**. These experiences have allowed me to understand product challenges: delivering a reliable first version quickly and preparing for the future evolution of the application.
This diversity has taught me to ask the right questions before coding: understand the real need, identify constraints, deliver only what is useful.
My process: short sprints, regular deliveries, a single point of contact from scoping to go-live.
Need a **competent web developer**?
Let's talk.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km), Bordeaux (up to 50km), Reims (up to 50km), Marseille (up to 50km), Lyon (up to 50km)
Experience
- KarotteWeb DeveloperHEALTH AND WELLNESSOctober 2025 - December 2025 (2 months)Bordeaux, France-> Client: Karotte, HealthTech Startup, FrenchTechTremplin 2025 Winner-> Position: Web Developer-> Objective: Develop a high-performance back office to efficiently centralize and manage business data-> Achievements:
- Backend web development of a BFF (Back For Front)APIwith.NETto map business logic withFirebase/Firestore
- Frontend web development ofinterfaceswithVue.jsandTailwind CSSallowing consultation, addition, and editing of exercise and activity data subsequently used in the mobile application
-> Technical Stack: C#, .NET, Vue.js, Tailwind CSS, Firebase, FireStore - FLOALead Tech | Web DeveloperBANKING AND INSURANCEApril 2023 - March 2026 (2 years and 11 months)Bordeaux, France-> Client: Floa, BNP Paribas FinTech, French leader in installment payments, 800k+ B2C users, 100+ B2B partners-> Position: Lead Tech | Web Developer-> Objective: Design and evolve.NET APIsand digital journeys for installment payment and device trade-in solutions, while leading the development team and ensuring delivery quality-> Achievements:
- Design and development of critical.NET APIs(installment payments, Cdiscount partnership, email/SMS/notification communications) and migration of existingAPIsinC#**, **.NET**, **SQL Server**, and **Azure Storageto enhance **reliability**, **performance**, and **partner integration**.
- Leadership of a team (4 developers, QA, PO) and structuring of practices aroundC#**, **.NET**, **API**, **SQL Server**, and **RabbitMQto improve delivery **performance**, code **quality**, and service **scalability**.
- Development of the Circle Pay As A ServiceSaaS**: partner **.NET APIs(Back Market, Nestgreen), merchantAPIs(Pixmania, Cdiscount), back office, and customer journeys in **Vue.js**, **TypeScript**, and **Tailwind CSS**, improving product visibility, user experience, and integration capabilities.
-> Key Figures:- €1M+ per day on the subscription journey, migrated without interruption
- 50k+ communications (email + SMS) per month
-> Technical Stack: C#, .NET, API, Vue.js, Tailwind CSS, TypeScript, SQL Server, Node.js, Nuxt.js, RabbitMQ, Azure Storage - uku.wtfMobile Application Developer | Web DeveloperSOCIAL NETWORKSFebruary 2022 - March 2023 (1 year and 1 month)Paris, France-> Client: uKu, GenZTech Startup, +€2M raised-> Position: Mobile Application Developer | Web Developer-> Objective: Design a real-time social platform for teenagers with a multiplayer 3D game, voice chat, and screen sharing, optimizing performance and user experience-> Achievements:
- Development of a real-time multiplayer 3D game usingUnity**, **C#**, and **.NET**, with a **Node.js matchmakingsystem (Colyseus SDK) to automatically connect players into rooms → improved engagement, fluidity, and product visibility.
- Design of avoice chatmobile app inReact Native**, **TypeScript**, **JavaScript**, and **Expo(EAS), with a scalable architecture compatible with theReact.js/Next.jsecosystem → fluid social experience and performance gains on mobile.
- Implementation ofnative iOS screen sharingusingSwift**, **SwiftUI**, and **Objective-C**, interfaced with **Expoand global performance optimizations → improved perceived quality and more stable real-time interactions.
-> Key Figures:- 1000+ users in early access
- Less than 1 second to reach the app's home screen
-> Technical Stack: C#, .NET, Unity, Node.js, Next.js, React.js, React Native, Swift, SwiftUI, TypeScript, JavaScript, Expo (EAS), Objective-C, iOS
Reviews
Louise
Développeur Web - Sway
Reviewed on 4/9/2026
I had the chance to work with Etienne and he is definitely the kind of profile you're happy to have on your side.
Technically solid (expertise in .NET + Vue.js for this mission), he covers a broad spectrum without being superficial on any aspect.
Responsive and rigorous in his deliveries, with real added value in what he builds.
You can feel the FinTech experience behind him, and it elevates the level of discussions.
I recommend him without hesitation.
H
Harmony
Nous referons appel à ses services ! - TIA
Reviewed on 4/7/2026
Etienne integrated seamlessly into our team to bring his expertise at a key moment in our development (especially on deployment) and understand our specific business needs. He was professional, rigorous, and most importantly, he responded very quickly to our needs, taking a significant burden off our shoulders! We will use his services again!
Recommendations
JA
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Education
- Engineering degreeTroyes University of Technology2017
- University Technology Diploma (DUT)University of Reims Champagne-Ardenne2014