Freelancer profile translated to English.
Back to original languageAbout Arnaud
React.js, Node.js, and React Native Developer with +20 years of experience.
I design complete web and mobile applications in TypeScript: React interfaces, React Native iOS/Android apps, and robust APIs with Node.js (Koa, Express, Fastify).
What I deliver:
→ Cross-platform mobile apps (React Native, Expo)
→ Performant React.js / Next.js frontends
→ REST & real-time APIs (Node.js, WebSocket)
→ Stripe, Firebase, RevenueCat, AWS integrations
Recent achievements:
- Backend + back-office for e-learning app (7 months) - Node.js, TypeScript, React, Stripe
- Marketplace with Stripe Connect payments - Firebase, real-time geolocation
- Algorithmic trading platform - React, Node.js, WebSocket, MongoDB
Stack:TypeScript, React.js, React Native, Next.js, Node.js, Koa, PostgreSQL, MongoDB, Redis, Firebase, Stripe, Docker, AWS
Contact me to discuss, I respond within the day!
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km), Lyon (up to 50km), Marseille (up to 50km), Bordeaux (up to 50km), Lille (up to 50km)
Experience
- Client anonymeS&P Sniper - Development of a trading botPRIVATE EQUITYOctober 2025 - December 2025 (2 months)Aix-en-Provence, France
Objectives
Develop the full-stack S&P Sniper platform, a professional algorithmic trading tool for the US markets (S&P 500), combining real-time execution, advanced backtesting, and an interactive user interface for strategy configuration and monitoring.Achievements
- Design of a unified trading engine in Node.js/TypeScript, managing real-time data, high-fidelity backtesting, risk management, and multi-broker integration (Alpaca, Interactive Brokers).
- Development of the React 19 frontend with a dynamic dashboard, graphical visualization (Lightweight Charts), and live strategy management via WebSocket.
- Implementation of a modular and type-safe architecture (100% TypeScript), with automated tests (Jest/Vitest), continuous monitoring, and automatic service recovery for production reliability.
Technical Stack
Node.js, TypeScript, Koa, MongoDB, Mongoose, WebSocket, React 19, Vite, Material UI, Lightweight Charts, Jest, Vitest, Alpaca Markets API, Interactive Brokers API, Docker - Les FondatricesDevelopment of the backend and back-office for the mobile application Les FondatricesEDUCATION AND E-LEARNINGMarch 2025 - October 2025 (7 months)Lyon, France
Objectives
Design and develop a complete backend infrastructure and a custom admin back-office for the Les Fondatrices mobile platform, combining robustness, security, and scalability.Achievements
- Development of a high-performance Node.js/TypeScript API with Koa and TypeORM, ensuring a scalable architecture, optimized response time, and advanced security (JWT, OAuth 2.0, rate limiting).
- Creation of a user-friendly React + Vite back-office with Material UI and TailwindCSS, allowing centralized management of content, users, and Stripe/RevenueCat transactions.
- Complete integration of third-party services (Mux, Firebase, Brevo, Mapbox, France Travail) to provide a seamless experience, accurate analytical tracking, and business process automation.
Technical Stack
Node.js, TypeScript, Koa, TypeORM, MariaDB, Redis, React, Vite, Material UI, TailwindCSS, Stripe, RevenueCat, Mux, Firebase, Brevo, Mapbox - Nos Chiens et NousDevelopment of the backend and back-office for the mobile application Nos Chiens et NousSOCIAL NETWORKSSeptember 2024 - March 2025 (6 months)Paris, France
Objectives
Design and develop the complete backend and back-office for the Nos Chiens et Nous platform, a social and canine marketplace application combining owner meetups, dog-sitting services, and integrated payments.Achievements
- Node.js/TypeScript backend architecture (Koa, TypeORM) on MariaDB and Redis, ensuring performance, scalability, and advanced security (JWT, Helmet, rate limiting).
- Integration of a complete marketplace system with Stripe Connect payments (KYC, SEPA payouts), Apple/Google subscriptions, and an automated booking and quote workflow.
- Implementation of real-time and geolocation features: Firestore chat, Firebase push notifications, GPS tracking, and management of interactions between users and dog sitters.
Technical Stack
Node.js, TypeScript, Koa, TypeORM, MariaDB, Redis, Firebase (Auth, Firestore, Storage, FCM), Stripe Connect, Apple Store, Google Play Billing, Docker, Mapbox, Mailjet
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Education
- SI Project Manager, Computer EngineeringInstitut G42015