About me

I create eco-friendly websites with a real eco-design approach, not marketing greenwashing. Based in Rennes, I also work for clients in Quimper, Paris, Berlin or remotely.

My vision

Digital technology now represents a growing part of our carbon footprint. As a web developer, I'm committed to designing websites and applications that minimize their environmental impact without compromising user experience.

Josselin HANEL - About me

Technical skills

Frontend

Astro

Framework-agnostic web builder generating mostly static HTML, excellent natural SEO and optimal performance.

A tool that creates fast websites easily found on Google, without forcing any particular technology.

Tailwind

Utility CSS framework facilitating collaborative work and responsive design. CSS purging guarantees ultra-optimized stylesheets.

System that quickly creates designs adapted to all screens, while keeping the site lightweight.

CSS Pro

Advanced CSS techniques for responsive design and smooth animations, reducing reliance on resource-intensive JavaScript.

Techniques for creating websites that adapt to all screens with smooth, lightweight animations.

TypeScript

Typed superset of JavaScript for more robust and maintainable code, reducing errors and technical debt.

An improved version of JavaScript that helps prevent bugs and makes teamwork easier.

HTMX

Ultra-lightweight library (~14kb) adding AJAX and WebSocket capabilities directly to HTML.

A small tool that makes web pages interactive without making the site heavier.

Backend

Astro + Workers

Edge-first architecture: Astro for static/SSR rendering with API routes, complemented by Workers for edge-side business logic.

Astro builds pages and creates routes for dormant agents (Workers) that wake up only when needed. More economical than a permanent server.

Supabase

Managed backend (CRUD, auth, storage). PostgreSQL + PostgREST auto-generating a REST API. Ideal for quick starts.

A service that stores your data and manages user logins, without installing or maintaining a server.

Phoenix (Elixir)

Custom backend for interactive, real-time applications. LiveView eliminates client-side JavaScript. Handles thousands of simultaneous visitors.

A complete server you fully control. Excellent for real-time features and thousands of simultaneous visitors.

Databases

PostgreSQL

Powerful open-source relational DBMS with an almost infinite extension ecosystem.

A reliable and versatile database that stores your information in an organized and secure way.

PostgREST

Instantly transforms a Postgres DB into a REST API. Can bypass backend entirely in some cases.

A tool that provides easy and secure access to stored data without writing a lot of code.

MongoDB

NoSQL document database enabling data flexibility and adaptable schemas.

A flexible database that easily adapts to changes and stores various information types.

Tools

Git

Essential for collaborative development, clear change tracking and simultaneous contributions.

A system that allows multiple people to work on the same project without conflict.

Docker

Perfect environment reproducibility. Docker Compose for orchestration, Swarm for scalable deployment.

A tool that ensures the site will work the same way everywhere.

Lighthouse

Essential audit tool for objectively measuring web performance and environmental impact.

A tool that analyzes your site and suggests improvements to make it faster and greener.

Methodologies

Accessibilité

Performance & Éco-conception

UX/UI

Intuitive interfaces meeting actual user needs. Reduces friction and improves engagement.

Designing sites that are easy and pleasant to use, genuinely meeting visitor needs.

Professional experience

Freelance web developer

2025 - Present

Independent

Design and development of websites and applications for various clients with special attention to environmental impact.

Webmaster

2024 - 2025

Objethèque de Cornouaille

Integration and development of user interfaces to showcase the association's activities and events.

Education

TP développeur web et web mobile

2025

Studi

Titre RNCP de niveau 5, formation full stack (backend et frontend).

The Odin Project

2023 - 2024

Auto-formation

Parcours complet de développement web full stack avec focus sur JavaScript et technologies modernes.

Veille technologique

2022 - Présent

Sources diverses

Auto-formation continue à travers documentation, blogs techniques, conférences et communautés spécialisées.

Have a project in mind?

Feel free to contact me for a free quote with no obligation.

Contact me

+33 7 81 33 97 68