Software Engineer with 3+ years of commercial experience designing, building, and deploying full-stack web applications. Proven ability to own features end-to-end, from API architecture and database design through to responsive UI and CI/CD pipelines. Currently building SurplusFlow — an AI-powered B2B marketplace for industrial surplus materials — handling product design, full-stack development (Next.js, Supabase, Stripe Connect), AI integration (GPT-4 Vision, embeddings, matching algorithms), and go-to-market strategy. Looking for a software engineering role or startup environment where I can bring both strong technical execution and product thinking.…

Yoann Chelin

Software Engineer with 3+ years of commercial experience designing, building, and deploying full-stack web applications. Proven ability to own features end-to-end, from API architecture and database design through to responsive UI and CI/CD pipelines. Currently building SurplusFlow — an AI-powered B2B marketplace for industrial surplus materials — handling product design, full-stack development (Next.js, Supabase, Stripe Connect), AI integration (GPT-4 Vision, embeddings, matching algorithms), and go-to-market strategy. Looking for a software engineering role or startup environment where I can bring both strong technical execution and product thinking.…

Available to hire

Software Engineer with 3+ years of commercial experience designing, building, and deploying full-stack web applications.
Proven ability to own features end-to-end, from API architecture and database design through to responsive UI and
CI/CD pipelines. Currently building SurplusFlow — an AI-powered B2B marketplace for industrial surplus materials —
handling product design, full-stack development (Next.js, Supabase, Stripe Connect), AI integration (GPT-4 Vision,
embeddings, matching algorithms), and go-to-market strategy. Looking for a software engineering role or startup
environment where I can bring both strong technical execution and product thinking.

See more

Skills

Experience Level

React JS
Expert
TypeScript
Expert
JavaScript
Expert
Node.js
Expert
Express
Expert
PostgreSQL
Expert
Docker
Expert
MongoDB
Expert
Tailwind
Expert
Socket.IO
Intermediate
Stripe
Intermediate
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Language

French
Fluent
English
Fluent

Work Experience

Founder & Lead Developer at SurplusFlow
April 1, 2026 - Present
Founded SurplusFlow and designed and built a complete AI-powered B2B marketplace for industrial surplus materials from scratch using Next.js 14, TypeScript, Supabase, and Stripe Connect. Implemented three AI agents: Cataloguer (GPT-4 Vision) for photo-to-material identification and dynamic pricing, Matcher (embeddings + relevance scoring) for buyer-seller pairing, and Compliance (automated waste-tracking documents + carbon footprint reports). Built multi-layered anti-fraud systems (EXIF verification, reverse image detection, SIRET validation via INSEE API, Stripe escrow with buyer confirmation). Architected PostgreSQL with PostGIS for geo-matching, French full-text search, Row-Level Security, and custom PL/pgSQL functions for trust scoring. Led go-to-market efforts with LinkedIn outreach and a lean pilot pipeline targeting 100+ companies.
Full-Stack Developer at Ty Bugale
March 1, 2025 - January 1, 2026
Designed and built a stock management web application using React, Node.js, and MongoDB. Architected RESTful APIs with Express.js and implemented responsive front-end features, reducing manual data entry by automating key workflows. Managed the MongoDB schema and queries for growing datasets and set up CI/CD pipelines.
Full-Stack Developer at EOR Consultants
September 1, 2024 - January 1, 2025
Led the end-to-end redevelopment of a client management platform for a retirement consulting firm (Laravel, PHP, JavaScript), improving usability and maintainability. Delivered new features and internal tools that reduced onboarding time and refactored legacy code to enable easier future development.
Full-Stack Developer at Kaiman
February 1, 2023 - September 1, 2023
Developed a custom CMS from scratch using the MERN stack (MongoDB, Express, React, Node.js) for content and administrative workflows. Designed and documented RESTful APIs and managed the full database architecture across the platform development lifecycle.
Software Developer at APC Info Service
July 1, 2021 - January 1, 2022
Developed point-of-sale and sales management desktop software for retail environments, supporting logistics and daily operations.

Education

MSc in Computer Science Engineering at Epitech
January 1, 2020 - January 1, 2025
Exchange Year at AGH University of Science and Technology
January 1, 2023 - January 1, 2024

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Professional Services, Manufacturing, Retail, Media & Entertainment
    paper Marketplace B2B surplusflow

    SurplusFlow — AI-Powered B2B Industrial Marketplace (in progress)
    Next.js 14 · TypeScript · Supabase · Stripe Connect · OpenAI GPT-4 Vision · PostGIS · Vercel
    Marketplace connecting manufacturers with surplus raw materials (metals, plastics, construction) to buyers. AI agents for
    photo verification, automatic matching, and regulatory compliance. Multi-layered anti-fraud system with trust scoring.