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I'm a developer who specializes in React-Native, React and Next.js. With a Master’s in Engineering and hands-on experience as a Tech Lead, I build fast and polished cross-platform apps (mobile, web, and Smart TV). What sets me apart: - Proven Sector Expertise: Delivered mission-critical products in Healthcare (Sanofi, APHP), Fintech (Milleis Bank), Retail (Decathlon), and Media (FranceTV, MPG/Ligue1). - Product & User Focus: Trained in product-first engineering, I act as a technical partner who prioritizes user experience, fast time-to-market, and high-impact features over unnecessary technical complexity. - Multi-Platform Engineering: Specialized in building seamless user experiences across Web (Next.js), Mobile (Expo), and Smart TV, with deep expertise in universal applications. - AI-First Velocity: Combining AI-assisted workflows (Claude) with clean engineering to ship features faster without compromising code quality…I'm a developer who specializes in React-Native, React and Next.js. With a Master’s in Engineering and hands-on experience as a Tech Lead, I build fast and polished cross-platform apps (mobile, web, and Smart TV). What sets me apart: - Proven Sector Expertise: Delivered mission-critical products in Healthcare (Sanofi, APHP), Fintech (Milleis Bank), Retail (Decathlon), and Media (FranceTV, MPG/Ligue1). - Product & User Focus: Trained in product-first engineering, I act as a technical partner who prioritizes user experience, fast time-to-market, and high-impact features over unnecessary technical complexity. - Multi-Platform Engineering: Specialized in building seamless user experiences across Web (Next.js), Mobile (Expo), and Smart TV, with deep expertise in universal applications. - AI-First Velocity: Combining AI-assisted workflows (Claude) with clean engineering to ship features faster without compromising code quality

Remi Leroy

Web Developer, Software Engineer, Back-End Developer, +2

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I'm a developer who specializes in React-Native, React and Next.js. With a Master’s in Engineering and hands-on experience as a Tech Lead, I build fast and polished cross-platform apps (mobile, web, and Smart TV). What sets me apart: - Proven Sector Expertise: Delivered mission-critical products in Healthcare (Sanofi, APHP), Fintech (Milleis Bank), Retail (Decathlon), and Media (FranceTV, MPG/Ligue1). - Product & User Focus: Trained in product-first engineering, I act as a technical partner who prioritizes user experience, fast time-to-market, and high-impact features over unnecessary technical complexity. - Multi-Platform Engineering: Specialized in building seamless user experiences across Web (Next.js), Mobile (Expo), and Smart TV, with deep expertise in universal applications. - AI-First Velocity: Combining AI-assisted workflows (Claude) with clean engineering to ship features faster without compromising code quality…I'm a developer who specializes in React-Native, React and Next.js. With a Master’s in Engineering and hands-on experience as a Tech Lead, I build fast and polished cross-platform apps (mobile, web, and Smart TV). What sets me apart: - Proven Sector Expertise: Delivered mission-critical products in Healthcare (Sanofi, APHP), Fintech (Milleis Bank), Retail (Decathlon), and Media (FranceTV, MPG/Ligue1). - Product & User Focus: Trained in product-first engineering, I act as a technical partner who prioritizes user experience, fast time-to-market, and high-impact features over unnecessary technical complexity. - Multi-Platform Engineering: Specialized in building seamless user experiences across Web (Next.js), Mobile (Expo), and Smart TV, with deep expertise in universal applications. - AI-First Velocity: Combining AI-assisted workflows (Claude) with clean engineering to ship features faster without compromising code quality

Next availability:

October 26, 2026

Lausanne, Switzerland

I’m a developer who specializes in React-Native, React and Next.js. With a Master’s in Engineering and hands-on experience as a Tech Lead, I build fast and polished cross-platform apps (mobile, web, and Smart TV).

What sets me apart:

Proven Sector Expertise: Delivered mission-critical products in Healthcare (Sanofi, APHP), Fintech (Milleis Bank), Retail (Decathlon), and Media (FranceTV, MPG/Ligue1).
Product & User Focus: Trained in product-first engineering, I act as a technical partner who prioritizes user experience, fast time-to-market, and high-impact features over unnecessary technical complexity.
Multi-Platform Engineering: Specialized in building seamless user experiences across Web (Next.js), Mobile (Expo), and Smart TV, with deep expertise in universal applications.
AI-First Velocity: Combining AI-assisted workflows (Claude) with clean engineering to ship features faster without compromising code quality

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

French

Fluent

English

Advanced

Spanish; Castilian

Beginner

Japanese

Beginner

Work Experience

React multi-brand management / Web development at Sanofi

March 1, 2023 - September 1, 2025

Built marketing websites using Next.js and performed testing/optimization. Reduced testing error logs by 70% to improve test reliability and readability.

Software Engineer / Front-End & Back-End (React / React Native) at Theodo Apps

March 1, 2023 - September 1, 2025

Contributions across multiple products and releases: Expo React Native patient tracking app (Expo + back office + Nest back-end), release of apps to stores, and development of a TV app on Vega OS. Supported react-tv-space navigation library, banking app revamp, and secure transfers (SSLPinning / SDK integration).

AI-first developer (Unity development, Theodo Apps) at Vrd development on Unity (Theodo Apps / Theodo Apps - ex-BAM)

July 1, 2022 - September 1, 2025

Revamp of a universal football app: migration to Expo (web + mobile), implementation of animations and charts (Reanimated + Skia), and development of an AI training program with Cloud Design. Worked on an Expo application with Matter private error monitoring, and contributed to the new design system for Theodo Apps.