Freelancer profile translated to English.
Back to original languageAbout Xavier
🦸♂️ Web Developer & Mobile Developer
Full-Stack JavaScript – SaaS and CRM (React / Next / Node) &
Hybrid Mobile Applications (React Native / Expo).
🏆 100% of reviews rated 5/5 on MALT
✅ +15 years of experience
🏅 Malt Profile SuperMalter level 2
👍 Client recurrence
What I do for you:
👨💻 CustomSaaS (customer management, back-office, subscriptions, Stripe, analytics).
🖥 PersonalizedCRMs (sales management, mission tracking, reporting).
📲 Cross-platform hybrid **mobile applications**.
📈API Integration, security, role management, and scalability.
My expertise:
🚀 FullStack JSweb and mobiledeveloper, specializing in the development of SaaS platforms, custom CRM solutions, and hybrid mobile applications (iOS and Android).
I design and manage your projectsfrom A to Z:UX/UI, front-end (React/Next.js/Vite), back-end (Node.js/Firebase/NoSQL/PostgreSQL), and mobile (React Native).
Result: performant, scalable, and user-centric applications.
My promise:
👍 Transform an idea into a reliable, scalable, and user-centric digital product, with clear guidance and proven responsiveness.
🛠️ Technical skills (in brief):
React.js, Next.js, Nest.js, Expo, React Native, Node.js, NoSQL, PostgreSQL, TailwindCSS, Web application developer, hybrid mobile developer, SaaS and CRM application developer, web developer
📦 Project types (in brief):
- SaaS/CRM creation from A to Z
- Technical refactoring to Next.js / React / Node
- Rapid MVP: scoping → mockups → development → deployment
- Hybrid mobile application with React Native
- Secure back-office/admin (roles, files, stats, PDF)
- Stripe integration (subscriptions, payments, invoices)
🔎 Do you have a SaaS, CRM, or mobile app to launch or improve?
French
Native or bilingual
English
Native or bilingual
Remote only
Primarily works remotely
Experience
- MaiDay AppReact Native Application Marketplace Developer - iOS / AndroidHOSPITALITYAugust 2025 - February 2026 (6 months)Nice, FranceContext:Marketplace mobile application with a dual objective:1/ Mobile extension of the MaiDay SaaS for concierge services (mission and provider management).2/ Direct connection platform between owners of short-term rentals (like Airbnb) and independent cleaning providers.Role:Product design, mobile technical architecture, and cross-platform iOS / Android development.Business Objectives:
- Allow providers to accept or decline missions
- Offer owners an intelligent search and matching system
- Centralize scheduling, notifications, and communication
- Synchronize data in real-time with the SaaS
- Secure payments via trusted third parties
Achievements:- Mobile architecture connected to Node.js API
- Complete development under React Native / Expo
- Implementation of a mission matching and application system
- Real-time in-app messaging setup
- Post-mission user review management
- Stripe integration with payment escrow
- Push notification management (Firebase Cloud Messaging)
- Offline-first and synchronization logic implementation
- Mobile performance optimization
- iOS and Android cross-platform development
Tech Stack:React Native, Node.js, Expo, Firebase Cloud Messaging, PostgreSQL, Stripe - M.A & EXPERTISEFullstack Developer React / React NativeREAL ESTATEApril 2025 - December 2025 (8 months)Fréjus, FranceGeneral Context:Business mobile application for real estate agents for complete management of property diagnostics (Energy Performance Certificates), quotes, and appointments, with an administrator SaaS back-office.Role:Technical design, architecture, and fullstack development from scratch (mobile + web admin).Business Objectives
- Simplify a complex technical process for agents
- Centralize all diagnostic files
- Enable reliable and fast field use (offline mode)
- Streamline the transmission of documents and quotes
Achievements- UX design and Figma mockups respecting the existing brand guidelines
- Backend and database architecture
- iOS / Android mobile application development
- Offline-first mode implementation with synchronization
- Attachment upload and secure storage management
- Web SaaS back-office development
- Production environment and store deployment
Tech Stack:React Native, PostgreSQL, React.js, Node.js, Prisma, Vercel - USA InsoliteFullstack Developer React Native / Next.js · Mobile ApplicationTRAVEL AND TOURISMNovember 2025 - February 2026 (3 months)Nice, FranceContext:Design and development of a mobile application dedicated to road trips in the USA.Role:Fullstack design and development up to production deployment on the stores.Product Objectives:
- Provide a POI database in a list with advanced filters
- POI Map (MapBox)
- Freemium business model with subscription (in-app purchase)
- Management of favorites, visited places, and advanced filters
- Manage community contributions with moderation
Achievements:- React Native mobile application development (Expo) iOS & Android
- Integration of interactive maps with Mapbox and marker clustering
- Implementation of offline-first mode with local SQLite cache (premium feature)
- Email + Password, Apple, and Google authentication system
- Backend development with secure RESTful API (Next.js API Routes) and PostgreSQL + PostGIS database (geospatial queries)
- Design and implementation of the relational data schema with Prisma ORM
- Integration of RevenueCat for managing subscriptions and in-app entitlements (iOS)
- Development of a web administration interface for moderation and POI curation, with generative AI integration (OpenAI) — structured prompt engineering for automatic generation of POI descriptions, manual validation workflow ensuring editorial quality (80% time saving in writing)
- Serverless architecture on Vercel with TurboRepo monorepo and TypeScript type sharing between apps
- CI/CD via GitHub Actions + EAS Build
- App Store and Google Play Store deployment and publication
- Analytics setup
Tech Stack:React Native · Expo · TypeScript · Next.js · Node.js · REST API · PostgreSQL · PostGIS · Prisma ORM · Mapbox · Firebase Auth · RevenueCat · In-App Purchase · NativeWind · TurboRepo · Vercel · EAS Build · SQLite · Serverless · Open API · ChatGPT · LLM · Prompt Engineering · Generative AI · CI/CD · GitHub Actions
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Education
- Mobile application designer and developerOpenClassrooms Fullstack2017iOS, Android, React Native Cross-platform frameworks
- Web designerLigne et Formations2009Web design UI/UX