Freelancer profile translated to English.
Back to original languageAbout Matthieu
Frontend Developer specializing in React, TypeScript, I intervene as a freelancer to accelerate, structure, or secure complex web projects.
With 5+ years of experience, I am comfortable on assignments with large companies, tech startups, agencies, or business products.
Key Expertise:
- Modern, performant, and scalable web interfaces
- React/Next.js Stack, Design System, CI/CD (Github Action), testing (Jest)
- GraphQL/REST API integration, headless CMS (Sanity, Medusa)
- Advanced Animation & 3D: Framer Motion, GSAP, React Three Fiber
- Core Web Vitals / SEO / Accessibility Optimization
- Advertising Compliance: IAB, Google Ads Manager, Piano Analytics
Examples of Impact:
- +40% UI productivity through an industrialized design system
- Lighthouse scores improvement >90 for several projects
- Enriched display formats → +CTR and better ad monetization
- Creation of a SPA integrating YouTube content → + user engagement
- Custom API and CMS for better client autonomy
Based in Anglet – available in full remote / hybrid.
Freelance or payroll contracting possible.
Available quickly for missions from 3 weeks to 6 months+
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km)
Experience
- LosAngeluFrontend Developer - React/TypeScriptDIGITAL AND ITDecember 2022 - Today (3 years and 8 months)Anglet, FranceAs a freelance developer, I had a direct impact on the performance, quality, and scalability of the products delivered to my clients:
- Modernization of the technical stacks of several client projects through appropriate technology choices (React, Next.js, TypeScript, Tailwind, Framer Motion), which resulted in faster, more animated, and maintainable interfaces;
- Implementation of design systems (atomic design), reducing UI design/development time by over 40%;
- Optimization of web performance (Lighthouse, Core Web Vitals), allowing several sites to go from "average" scores to scores >90, with a direct impact on SEO and conversion rates;
- Industrialization of advertising production for agencies or brands, with innovative display formats (preroll, interstitial, animated banners), contributing to increased ad revenue;
- Creation of a SPA integrating YouTube, allowing users to navigate rich content smoothly, which significantly increased engagement and time spent on the platform;
- Support for non-technical clients in understanding and structuring their needs, enabling them to gain autonomy once the tools were delivered.
Quantified / bullet point summary:- +40% UI productivity thanks to an industrialized design system
- Lighthouse score >90 on several delivered projects
- Optimized display formats = +CTR and +monetization
- + autonomy for clients through clear documentation
- + user engagement via interactive and animated interfaces
- M PublicitéFrontend DeveloperPRESS AND MEDIASeptember 2024 - June 2025 (9 months)Paris, FranceAt M Publicité, the advertising agency of Le Monde Group, I contributed to modernizing and industrializing the production of digital assets by:
- Implementing a modern stack (Next.js, TypeScript, Tailwind, Framer Motion), which reduced development time by 30% on campaign mini-sites;
- Developing more performant and responsive event and brand sections mini-sites, increasing their loading speed and accessibility, which improved advertising performance;
- Creating custom banners and rich media formats for advertisers, with tailor-made integrations (carousel, skinning, autoplay video formats), enabling better monetization and click-through rates;
- Defining a scalable design system in Figma (based on Atomic Design) interconnected with front-end components, facilitating UI consistency and reusability;
- Implementing Piano Analytics for better campaign performance tracking and data reporting;
- Integrating and deploying standard IAB formats in Google Ads Manager 360, which improved campaign fluidity for marketing teams;
- Designing video templates (interstitial, pre-roll, IMA SDK) for a more immersive mobile app experience, improving completion rates and video ad revenue.
- SmartchFrontend Developer - React/TypeScriptHUMAN RESOURCESApril 2023 - June 2023 (2 months)Anglet, FranceSmartch is a creative startup specializing in Learning & Development experience. I joined the team to contribute to the industrialization of the design system and the continuous integration of the Andragog platform.My tasks and impacts:
- Development of reusable atoms, molecules, and components in Storybook, facilitating the platform's scaling and accelerating interface integration;
- Implementation of unit (Jest), integration, and end-to-end tests, ensuring better code stability and reduced production bugs;
- Close collaboration with the design team via Chromatic, enabling automated visual validation and reducing design/dev iterations by 40%;
- Integration of validated components into the main application with React, RTK Query, and GraphQL, contributing to the harmonization of the user interface across the entire product;
- Active participation in Scrum rituals (daily, reviews, sprints), with GitLab CI/CD to ensure continuous and quality deliveries;
Worked within a team of 3 senior devs, 3 juniors, 2 POs, and a CTO, with a hybrid Scrum + Kanban organization.Stack used: React, TypeScript, RTK Query, GraphQL, Chakra UI, Emotion, Framer Motion, Storybook, Chromatic, Jest, GitLab, Jira.
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Education
- Professional title of Web and Mobile Application Developer ReactWild Code School2021Formation intensif en 5 mois avec un stage de 4 mois. L'apprentissage est basé sur le développement de sites internet interactifs qui utilisent les technologies HTML, CSS et JavaScript. Et grâce aux formateurs et à une plateforme pédagogique en ligne et à la réalisation de plusieurs projets professionnels, j'ai pu rapidement acquérir les bases du développement web et la maîtrise des langages informatiques et frameworks suivants : React/Node, Express, HTML/CSS, Next, prisma, GraphQL, MySQL et PostgreSQL.