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Antoine GuilloAG

Antoine Guillo

Full-stack web developer

€300/day
Rennes, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Antoine

Do you want to create or redesign your website, but you're getting lost in the ocean of "revolutionary" tools and "magical" AI-powered solutions?

I'll help you take a step back, lay the groundwork for your project, and guide you through its completion.

I am the founder of À Code Ouvert, a company dedicated to framing and designing web projects. After 9 years in customer relations, I successfully transitioned into web development. Today, I leverage these complementary skills to support my clients in a way that is both human-centered and technically proficient.

Specifically, I intervene to:

– Frame your web projects: understand your business, define objectives, make technical recommendations, and formalize a clear set of specifications.

– Design or redesign your site using proven open-source tools (WordPress, PrestaShop, Symfony), with an eco-design approach and by anticipating future developments.

– Evolve your site over time: new content, new features, performance optimization.

Too often, web projects start without serious framing. Vague objectives, premature tool selection, poorly defined needs. The result: misunderstandings, back-and-forth, exploding budgets, and sometimes project failure.

This is why I believe a web project begins long before the first line of code. Structuring the project upstream, understanding your business challenges, clarifying your objectives, and anticipating your future needs helps secure the subsequent phases and make technical choices that are truly adapted to your context.

My approach is based on this balance between business vision and technical mastery, to support you with a global perspective and solutions tailored to your constraints.

Do you have a project in mind or simply want to take a step back before diving in? I'd be delighted to discuss it with you.
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Rennes (up to 50km)

Experience

  • À Code Ouvert
    Freelance Developer
    SOFTWARE PUBLISHING
    January 2026 - Today (7 months)
    Rennes, France
    Many entrepreneurs start creating a website without knowing where to begin: choosing the tool, defining objectives, prioritizing features... The result: wasted time, exploding budgets, and frustration.

    À Code Ouvert supports its clients from the project framing phase, through its realization and evolution. I favor reliable open-source solutions (WordPress, PrestaShop, Symfony), combining performance, simplicity, and eco-design.

    As the founder, I guide my clients at every step: project framing, technical recommendations, specification formalization, development monitoring, launch, and future evolutions. My goal: transform their business needs into clear and effective web solutions.

    I emphasize understanding business challenges and anticipating future needs to build an scalable and sustainable website. Our approach combines technical expertise with customer relationship skills, securing each project and avoiding costly mistakes.
    Wordpress JavaScript, HTML5, CSS3, PHP, MySQL Prestashop Symfony Project Framing
  • Black Sequoia
    Web Developer
    E-COMMERCE
    January 2024 - December 2025 (1 year and 11 months)
    Rennes, France
    At BLACK SEQUOIA, my role as a Web Developer involved maintaining and improving e-commerce platforms using WordPress and PrestaShop.

    My responsibilities included developing new features aligned with the company's strategic objectives and meeting the dynamic needs of its business environment.

    My expertise in using Model-View-Controller (MVC) architecture, languages like PHP, MySQL, and Javascript allowed me to contribute to the following projects:

    Creation of two Prestashop modules to retrieve customer reviews collected via Ekomi and Trustpilot platforms: These modules use their APIs to fetch reviews, cache them, and display them as customized widgets, respecting usage terms.

    Creation of a module to integrate the company's new loyalty program with features such as:
    - Earning points on purchase or referral
    - Referrals
    - Using points to generate loyalty vouchers in euros
    - Tiered system with associated automated benefits
    - Automatic gifts (birthday, achieving a higher tier, referral)
    - Ability for administrators to create periods with bonus point earnings
    - Customer-facing interfaces (loyalty information, point tracking, FAQ, etc.)
    - Back-office interfaces
    - Automated emails (with opt-out option)
    - GDPR compliance
    - Program usage statistics

    Creation of several WordPress plugins aimed at implementing non-native functionalities (mobile menu management, creation of custom blocks retrieving data from the company's ERP).
    Prestashop Wordpress JavaScript, HTML5, CSS3, PHP, MySQL jQuery Object-Oriented Programming (OOP)
  • Black Sequoia
    Web Developer Intern
    E-COMMERCE
    August 2022 - October 2022 (2 months)
    Rennes, France
    As part of Black Sequoia's IT team, my mission was to create an online sales site with WordPress, using technologies like HTML5, CSS3, Javascript, and PHP.

    To achieve this, I was in constant communication with the project manager and the graphic designer, who provided me with the graphic mockups for the site's realization.
    Wordpress JavaScript, HTML5, CSS3, PHP, MySQL Smarty

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Education

  • Application Designer Developer, Computer Programming / Developer, General
    ENI School of IT
    2025
    Concepteur Développeur d'Applications, Programmation / développeur informatique, général
  • Web and Mobile Web Developer, Computer Programming
    Ecole O'clock
    2022
    Developpeur web et web mobile, Programmation informatique

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