Hi, I'm Sébastien — a Senior Software Engineer based in Hong Kong, shipping React and Next.js products end-to-end. Currently at Société Générale on FX trading systems, and co-founder & CTO of Symphone, a music-tech startup.
Internal full-stack tooling for global FX and post-trade trading systems. Backend in Java/Spring Boot, UI in React/Tailwind. Cross-timezone collaboration across HK ↔ Paris ↔ APAC.
Co-founded a music-tech startup. Sole engineer end-to-end: custom-PCB hardware, firmware, iOS/Android apps, Firebase backend, and Shopify e-commerce. Successful Kickstarter and product launch.
End-to-end frontend ownership across multiple side engagements. Flagship: PassCE — web app + Expo mobile app for a corporate benefits platform reaching 10,000+ daily users.
Software engineering inside the bank's internal technology division. Backend and frontend work on banking applications.
Software Engineering — MSc
Paris, France
Image Processing & Artificial Intelligence — Exchange
Barcelona, Spain
Software & Data Engineering — Exchange
Montreal, CanadaI build AI-powered products end-to-end — integrating LLMs and retrieval-augmented generation into real apps, plus hands-on work in reinforcement learning and image processing.
Building retrieval-augmented generation into full-stack products — grounding language models in real data.
Agents that learn from interaction, improving their policy through reward and feedback over time.
Image processing and applied AI — from classical pipelines to learned models.
A scripted, front-end demo assistant — no live model, just a quick way to explore my work.
2019 – 2020
Exchange · Concordia University
2020 – Present
Co-founder & CTO · Symphone
2021 – 2022
Exchange · Universitat Politècnica de Catalunya
2023 – Present
Hardware manufacturing · Symphone
2024 – Present
Senior Software Engineer · Société Générale
Co-founded a music-tech startup that helps beginners learn piano with a connected light bar. Built the iOS/Android apps, custom-PCB hardware integration, Firebase backend, and Shopify storefront. Successful Kickstarter, 10,000+ active musicians.
A consumer mobile app that helps people pick the most impactful photo of themselves — for LinkedIn, dating profiles, anywhere. Solo product: concept, UX, mobile (Expo), and companion site. Available on App Store and Google Play.
A two-sided mobile marketplace connecting users with photographers — like "Uber for photo sessions." Solo product: concept, UX, Expo mobile app, and Next.js companion site. Shipped on the App Store.
Web app + Expo mobile app for a French corporate benefits platform. Built the entire frontend as a freelance engagement, reaching 10,000+ daily active users. Backend (PHP) maintained by the client team.
I'm always open to interesting projects and conversations. Reach out and let's build something.