Freelancer profile translated to English.
Back to original languageAbout Mathieu
Is your WordPress site lacking performance, modularity, or in need of a technical overhaul? I'm Mathieu Marteau, a freelance WordPress developer in Lille, and I'll guide you from A to Z.
Passionate about web development since my teenage years, I worked for over 4 years in a web agency in Lille (WordPress, Prestashop, Symfony) before going freelance in 2022. Since then, I've been helping companies and agencies with the creation, optimization, and maintenance of their websites.
🔧 Custom WordPress Site Creation
I develop entirely custom sites, without page builders. My approach is based on Bedrock + Sage (Roots.io), with a modular architecture based on custom Gutenberg blocks via ACF Pro. The result: a high-performance, secure, and 100% manageable site. Each block is reusable on any page, giving you complete editorial freedom.
⚡ Web Performance & SEO
I optimize your existing sites to improve Core Web Vitals and PageSpeed scores. When creating a site, SEO fundamentals are natively implemented (markup, structure, internal linking, sitemap, structured data). I can also implement any technical SEO recommendation.
đź’Ľ My Services
– Custom WordPress site creation and redesign (custom theme, Gutenberg + ACF Pro)
– Responsive web integration HTML / SCSS / Tailwind CSS
– Web performance and technical SEO optimization
– WordPress maintenance, security, and updates
– Managed hosting
– PHP MVC back-end development, APIs, Custom Post Types
– CI/CD with Git / GitLab / GitHub
– Google Analytics, Tag Manager, GDPR compliance
🏢 References: Webedia, Décathlon PRO, Officéo, Niji
âś… No subcontracting: 100% of the work done by myself. Responsive and attentive, I work from mockups with specifications to ensure a result that meets expectations.
Looking for a freelance WordPress developer in Lille? Contact me.
English
Basic
English
Basic
French
Native or bilingual
French
Native or bilingual
Remote only
Primarily works remotely
Experience
- SuivuFounder & Full-Stack Developer (Mobile) — Personal ProjectCULTUREJuly 2026 - Today (1 month)Lille, FranceDesigned and developed, from A to Z and solo, an iOS and Android mobile application for tracking series and movies (a French alternative to TV Time).- Offline-first architecture: local SQLite database, optimistic interface, and seamless synchronization; idempotent mutations (ULID) and episode-based conflict resolution- Multi-source import (TV Time, Trakt, Simkl, CSV) with title matching (pg_trgm)- Release calendar, push notifications, anti-spoiler social dimension, statistics- Stack: React Native / Expo, TypeScript, Fastify API, PostgreSQL (Drizzle ORM), Redis / BullMQ, TMDB, RevenueCat, Docker, CI/CD GitHub Actions
- DeaLynxFounder & Full-Stack Developer — Personal ProjectE-COMMERCEJune 2026 - Today (2 months)Lille, FranceDesigned and developed, from A to Z and solo, a multi-site price and stock tracking SaaS (an alternative to Keepa / CamelCamelCamel).- Cascading scraping engine: structured data, per-merchant adapters, headless browser (Playwright), then anti-blocking services, with controlled and shared costs among users- Good deal score (weighted historical percentile) and multi-channel alerts (email, push, Telegram, Discord, SMS)- Browser extension (crowdsourced data collection) and mobile app- Stack: Nuxt 4 / Nitro, Vue 3, TypeScript, PostgreSQL (Drizzle ORM), pg-boss, Stripe, Docker, CI/CD
- WebediaFreelance Web DeveloperPRESS AND MEDIAFebruary 2023 - Today (3 years and 6 months)Lille, FranceI work monthly at Webedia. The tasks revolve around the WordPress CMS in a highly custom way.- Creation of WordPress websites with Bedrock + Sage 10 technologies (Laravel layer, Roots)- Implementation and improvement of ticketing APIs- HTML + SCSS integration with Blade (Desktop + Mobile)- JavaScript development- Development of various back-end functionalities with MVC architecture (PHP)- Integration with a CI/CD system + Gitlab- Ongoing maintenance
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Education
- BACHELOR "Computer Science and Networks"Lycée Privé Saint-Joseph2017Lors de mon année en Bachelor j'ai pu améliorer mes compétences dans les différents langages de programmation que ce soit pour le Front-End (HTM5 / CSS3 / SASS / JAVASCRIPT / JQUERY) avec l'aide du framework CSS3 bootstrap que Back-End (PHP / MYSQL). J'ai également approfondi mes connaissances sur le cms wordpress par rapport à la création de template personnalisé au niveau du Front-End et la partie plugin pour la partie Back-End J'ai eu l'opportunité d'être le Lead d'une équipe de développement pour un projet e-commerce en From scratch avec la techno node.js pour la partie API et tous les langages nécessaires pour la partie Front-End et Back-End (Cité ci-dessus) Cette année m'a permis d'être à l'aise avec tous les langages du web. Suite à ça, j'ai donc décidé de devenir officiellement développeur fullstack en entreprise car je maitrise autant la partie Back-End que Front-End.
- BTS SIOLycée Privé Saint-Joseph2016J'ai réussi très facilement mes deux premières années de formation dans le développement car comme cette filière était ce que je voulais faire depuis l'âge de 14 ans, je savais déjà les bonnes pratiques de base et quelques langages Front-End et Back-End. Pendant ma scolarité j'ai tout de même découvert des outils intéressant permettant l'accélération d'un projet comme le framework CSS3 bootstrap et le cms wordpress.
Certifications
- BTS Services Informatiques aux OrganisationsLycée Saint Joseph - Saint Martin Boulogne2016
- Bachelor Informatique et RéseauLycée Saint Joseph - Saint Martin Boulogne2017