Freelancer profile translated to English.
Back to original languageAbout Gautier
Hello 👋🏻
I am aJavaScript/TypeScript full-stack developer**, specializing in building **iOSandAndroidmobile applications with **React Native**, as well as SaaS products with **React and Next.js**.
Alongside my freelance work, I develop and market my own mobile applications and SaaS solutions. This solopreneur experience allows me to handle all aspects of a project: product definition, technical design, development, AI integration, monetization, app store publication, and continuous improvement.
My approach combines **technical expertise, product vision, and business acumen**. I don't just develop features; I aim to create a seamless, high-performing experience tailored to real user needs.
As a freelancer, I will help you bring your digital projects to life, fromPOC/MVPto a **complete web or mobile application**, ready for production.
🛠️Specialties:
- Mobile application development withReact Native and Expo
- iOS and Android development
- Front-end development withReact and Next.js
- Creation ofSaaS, MVPs, and complete applications
- Full-stack JavaScript and TypeScript development
- Integration of artificial intelligence and OpenAI APIs
- Setup of subscriptions and in-app purchases with Stripe
- Publication on theApp Storeand **Google Play**.
- Performance and user experience optimization
- Maintenance and evolution of existing products
🤝Let's collaborate
Are you looking for a developer who can understand your vision, advise you on technical choices, and transform your idea into a concrete, high-performing, and maintainable product?
I would be delighted to discuss yourmobile application, SaaS, or MVP.
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- Editions HolamigoBlablamigo App - Practicing SpanishEDUCATION AND E-LEARNINGNovember 2025 - July 2026 (8 months)Design and development of Blablamigo, a mobile application allowing users to practice spoken Spanish with an AI-powered conversation partner.• End-to-end mobile application development: architecture, interfaces, navigation, and data management.• Integration of a fluid voice conversation experience with speech recognition and synthesis.• Implementation of a conversational AI capable of understanding context and adapting responses to the user's level.• Development of personalized corrections to help users improve their vocabulary, fluency, and oral expression.• Selection of level, conversation themes, and progress tracking.• Integration of monetization through subscriptions and lifetime in-app purchases.• Testing, performance optimization, bug fixing, and publication on the App Store and Play Store.• Collaboration with Editions Holamigo on product choices, user experience, and functional enhancements.Application available on the App Store:
- Gautier ColasseFounder & React Native Mobile Developer — No ContactApril 2025 - Today (1 year and 4 months)Design, development, and marketing of **No Contact**, an iOS and Android mobile application that has surpassed **150,000 downloads**.I created this product from scratch, from the initial idea to user acquisition, handling the entire application lifecycle.🛠️My responsibilities:
- Definition of the concept, positioning, and product strategy
- Design of the user experience and onboarding flows
- Application development withReact Native, Expo, and TypeScript
- Backend setup, authentication, and data management
- Integration of **artificial intelligence**-based features
- Creation of a conversational assistant, interactive exercises, and tracking tools
- Integration of subscriptions and in-app purchases on iOS and Android
- Publication and maintenance on theApp StoreandGoogle Play
- Monitoring of retention, conversions, performance, and user feedback
- Continuous product optimization based on usage data
- Creation of visuals, store pages, landing pages, and marketing content
- Management of ASO, user acquisition, and advertising campaigns
This project illustrates my ability to **design, develop, launch, monetize, and evolve a complete digital product**, with a holistic vision combining technology, product, user experience, marketing, and business. - Editions Holamigo
On Malt
Fullstack Next.js DeveloperJuly 2024 - September 2024 (2 months)Creation of an MVP: a platform for practicing spoken Spanish through conversations with artificial intelligence.
Reviews
V
Valéry
LEGALIX
Reviewed on 12/13/2024
Gautier was involved in an urgent mission with efficiency and speed. Available and responsive, we appreciated his work and will call on him again if needed. We highly recommend him!
Pierre
Editions Holamigo
Reviewed on 9/9/2024
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Education
- Web and Web Mobile DeveloperÉcole O'Clock - Grande École du Numérique2021Les fondamentaux : HTML/CSS, utilisation de Git, Javascript avec la syntaxe ES6, POO Coté serveur : NodeJS, Express, PostGreSQL, API REST, structure MVC. Spécialisation : React, Redux, Hooks, Middlewares, Axios, WebScokets
Certifications
- Opquast Certification - Mastery of Quality in Web ProjectsOpquast2020