Freelancer profile translated to English.

Description

Fullstack developer for 9 years. In recent months, I built a medical dictation pipeline in production at Gleamer: real-time ASR transcription, template matching, and structured report generation by LLM. Before that, Apple Pay integration and native iOS/Android modules at Wigl. I also spent 2.5 years as Tech Lead at Retreeb, where I managed architecture, team standards, and onboarding. I work with React Native, React, Next.js, and backend NestJS or Spring Boot as needed.

Industry field of expertise

Languages

French
Native or bilingual
English
Native or bilingual

Workplace preferences

Can work on-site

Bordeaux (up to 10km), Paris (up to 10km)

Gleamer
Senior Fullstack Engineer — AI Medical Application (Gleamer Voice)
MEDICAL
January 2026 - May 2026 (4 months)
Paris, France
Gleamer is a scale-up specializing in medical AI for radiology. I contributed to the development of Gleamer Voice, their new SaaS product: an AI-assisted medical dictation web application, enabling radiologists to automatically generate structured reports from voice.

Features developed:
Voice-to-report pipeline: real-time ASR transcription (WebSocket streaming) → transcript correction by LLM → structured report generation
Automatic template matching by LLM (Google Gemini) during dictation
Health observability and compliance (GCP Cloud Logging, Pino, Sentry, audit logs)
CI/CD infrastructure: GitHub Actions, Docker, release-please, main/next channels

**Stack**: TypeScript · React (TanStack Start/Router/Query) · NestJS · PostgreSQL · WebSocket · Auth0 · GCP · Turborepo · Vitest · Playwright
NestJs React.js PostgreSQL LLM Gemini
Wigl
Senior React Native Engineer — Fintech & Apple Pay / Google Wallet
BANKING AND INSURANCE
January 2025 - October 2025 (9 months)
Grenoble, France
Wigl is a mobile banking application integrating cryptocurrency investment and card management. I joined the team for the launch of bank cards, a critical product feature.

Contributions:

Development of complete card management: ordering, activation, limit modification, blocking
Apple Pay and Google Wallet integration via native modules (in-app verification, in-app provisioning)
Integration of Xpollens BaaS for banking flows
Development in React Native / TypeScript on a high-stakes regulatory production codebase
React Native Typescript Xpollens Apple Pay Google Pay
Dune Health
React Native Engineer — High Performance UI & HealthTech
MEDICAL
October 2024 - January 2026 (1 year and 3 months)
Dune Health is an American healthtech startup developing an integrative health mobile application: medical tracking, AI coaching, wearable data, and personalized patient support.
I contributed mainly to the React Native mobile application (Expo SDK 54), with a strong focus on animations, performance, and custom graphical components.

Animations & graphic rendering:
Complex animated components with Reanimated 4 (shared values, layout animations, physics gestures)
Custom 2D rendering with Skia: dynamic lava lamp backgrounds (blur + color matrix), challenge discs, curved text path, blend modes
Dynamically driven Lottie animations and Rive animations for micro-interactions

UI & experience:
Complete design system in NativeWind, Skia canvas health widgets (heartbeat, sleep, breathing)
Multi-step onboarding, permissions management, legal consent
Performant lists with Flash List, Gesture Handler gestures

Product features:
Real-time AI chat, voice-to-voice (Pipecat + Daily.co / native WebRTC)
Wearable metrics via Terra, push notifications Notifee + Firebase
Analytics with native session replay (PostHog)
React Native Expo Skia Reanimated Gesture handler

Check out Romain's experience

Marie-Julie

Marie-Julie Simon

Reviewed on 10/15/2025

Mission perfectly executed. Romain developed the requested feature with professionalism and responsiveness. Very good understanding of the need, fast delivery, and quality code. I will not hesitate to call on him again later! Thanks again Romain :-))