AG
About
Full-stack web developer with 10+ years of experience, from PHP/Symfony agencies to the react-admin core team at marmelab 👨💻. I build and maintain open-source libraries ⚛️, design backends (Node.js, PostgreSQL, Supabase) and frontends (React, react-admin), and have recently shipped LLM-powered products integrating GPT and Claude 🤖. Also a teacher at heart: 5 years training aspiring web developers 🎓. I love music and sport 🤘💪
Work Experience
marmelab
2023-05 - Present
Full-Stack Web Developer
Core team member on react-admin (open-source) and consultant on client projects.
- - React-admin core team: developed new features, maintained the codebase, triaged issues, reviewed pull requests, maintained the premium edition, handled premium support and Discord community, contributed to documentation
- - Media streaming platform: built a backend-for-frontend layer with Express.js aggregating internal services for TV, smartphone and web clients; built a scheduling tool for broadcast lineups
- - International banking platform: backend services on PostgreSQL, frontend with react-admin, direct collaboration with English-speaking stakeholders
- - Health insurance chatbot: integrated GPT and Claude, backend on Supabase (edge functions, PostgreSQL), token usage monitoring, prompt evaluation with Promptfoo
Freelance
2020-10 - 2023-05
Freelance Web Developer
Independent developer building e-commerce modules and SaaS features for various clients.
- - Built PrestaShop 1.7 modules for generating quotes, with a Symfony-friendly backend and Preact frontend
- - Freelancer-marketplace platform: payment and subscription modules using the Stripe API, plus a custom CMS module in Symfony
- - Continued feature development and maintenance of a notary-office SaaS platform
CCI Campus Alsace
2018-09 - 2023-05
Web Development Instructor
Taught multiple cohorts of aspiring web developers.
- - HTML/CSS and Bootstrap
- - Git and version control workflows
- - Symfony and PrestaShop
- - API and web service fundamentals
Aradev Sarl
2019-10 - 2021-10
Co-founder & Tech Lead
Co-founded the agency, leading technical delivery across client projects.
- - Notary-office SaaS platform: REST API (Slim) and a Jotform-style form builder in Preact and PHP with configurable field types and conditional logic
- - B2B platform: new features with Symfony 4 and Twig, mobile-first, BEM methodology on a customized Bootstrap 5 base
- - Multiple custom PrestaShop modules, including a bulk EAN-13 label printing tool
La Boîte à Balises
2017-06 - 2019-09
Full-Stack Web Developer
Agency role, rotating across client projects.
- - Migrated a notary-office SaaS platform from single-tenant to multi-tenant architecture; shipped drag-and-drop task management, automated client email notifications and workload tracking (PHP 7, JavaScript/jQuery, MySQL)
- - Built and launched PrestaShop e-commerce stores, including custom module development
- - Developed an after-sales service module for a B2B bike distribution platform (Symfony 4)
- - Taught technical training courses at a vocational training center: Git, HTML/CSS, PrestaShop
Versusmind
2017-04 - 2017-06
PHP Developer
Contributed to the redesign of a stock market information platform.
- - CSS/JS integration from design mockups, API consumption with Symfony
- - Support ticket handling and bug fixing
Farvest
2016-06 - 2017-03
Junior Web Developer
Built and maintained websites for a Luxembourg-based media and events company.
- - Developed and integrated showcase websites with Drupal 7
- - Developed community sites (blogs and news portals) with Drupal 8
- - Created WordPress modules and themes, maintained existing solutions
La Boîte à Balises
2014-06 - 2015-08
Web Developer (apprenticeship)
Work-study apprenticeship in a web agency, contributing to several client projects.
- - CSS/JS integration from design mockups with a mobile-first approach
- - Front-end features for a travel planning application (PHP 5, Smarty, jQuery)
- - WordPress showcase websites, PrestaShop stores and custom modules
- - Front-end of a PrestaShop point-of-sale module; jQuery plugins (virtual keyboard, mega menu)
itslearning AS
2013-11 - 2014-05
Web Developer (apprenticeship)
First work-study apprenticeship, at an e-learning software company.
- - Built modules for a SaaS learning platform (jQuery, AJAX)
Education
CCI Campus Alsace
2013 - 2015
Web Developer & Integrator (Intranet / Internet solutions), Computer Science
École MJM Graphic Design
2012 - 2013
Multimedia Designer, Web and Print
Skills
Frontend:
React
Next.js
react-admin
Preact
TypeScript
JavaScript
HTML / JSX
Tailwind CSS
Bootstrap
jQuery
Backend:
Node.js
Deno
Express.js
REST APIs
PHP
Symfony
Slim
Python
PostgreSQL
MySQL
Supabase
AI / LLM:
GPT & Claude integration
Vercel AI SDK
OpenAI API
Tool Calling
Structured Outputs
AI Agents
Model Context Protocol (MCP)
Claude Code Skills
Prompt Engineering
LLM Reranking & Evals (Promptfoo)
Token usage optimization
CMS & E-commerce:
PrestaShop
WordPress
Drupal
Practices:
Open-source maintenance
Git
GitHub Actions
CI/CD Pipelines
Agile methods
Scrum
Remote work
Teaching & training
Projects
CuraBot
github.comadguernier/summarizor
AI-powered Discord bot that summarizes IT articles using OpenAI GPT models: automatic tag generation, "why it's interesting" explanations, interactive edit/regenerate flows.
TypeScript
OpenAI API
Express
Discord Interactions
Cheerio
Frequentito
github.comadguernier/frequentito
Office attendance app to let teammates know who is at the office and receive updates.
Next.js
TypeScript
Supabase
Tailwind CSS
HeroUI
Ethical Calc
github.comadguernier/le-cahier
Self-hosted household expense splitter: each member contributes according to income, with two calculation methods compared side by side. Deployable on a Raspberry Pi.
TypeScript
SQLite
Raspberry Pi
Self-hosting
Languages
French — Native
English — Professional proficiency
Interests
Music 🎸
Guitar
Drums
Metal lover 🤘
Recording
Home studio (DAW)
Sport 💪
Strength training
Ergonomics
Open source ⚛️
Books and movies 📚🎬
Comics
Science fiction
Heroic fantasy
Arts and culture 🎨
Environment 🌱