Matthieu OJeanson

As a freelance frontend developer, I’ve had a direct impact on the performance, scalability, and visual quality of several modern web applications and marketing platforms: - Helped clients modernize their tech stacks with React, Next.js, TypeScript, Tailwind, and Framer Motion, resulting in faster and more maintainable UIs; - Built scalable, reusable design systems (atomic design), reducing UI development time by over 40%; - Optimized web performance using Lighthouse and Core Web Vitals tools, enabling several projects to reach scores above 90, directly improving SEO and conversion rates; - Developed custom rich media ad formats (preroll video, interstitials, animated banners) that led to better click-through rates and monetization for media clients; - Created a YouTube-integrated Single Page Application that significantly increased user engagement and time-on-site through a seamless, dynamic experience; - Guided non-technical clients by structuring their needs and delivering clear documentation, making them more autonomous and confident with their product. Quick summary: - +40% UI productivity via reusable component systems - Lighthouse scores >90 → better UX & SEO - Increased ad revenue with optimized rich media formats - Empowered clients through smart tooling & clear docs - Boosted user engagement with smooth SPA interactions

At M Publicité, the advertising branch of Le Monde Group, I contributed to modernizing and streamlining the production of digital assets by: - Setting up a modern tech stack (Next.js, TypeScript, Tailwind, Framer Motion), which helped reduce development time by 30% on campaign microsites; - Developing event-based microsites and sponsored content sections that were more performant and responsive, leading to faster load times, better accessibility, and improved ad performance; - Creating custom digital assets and rich media formats for advertisers (carousel, skins, autoplay video formats), enabling better monetization and increased click-through rates; - Defining a scalable design system in Figma based on Atomic Design principles, fully connected to frontend components, enhancing UI consistency and component reusability; - Implementing Piano Analytics for improved campaign performance tracking and data reporting; - Integrating and deploying IAB standard display formats via Google Ads Manager 360, which optimized campaign delivery workflows for the marketing team; - Designing video templates (interstitials, pre-rolls, IMA SDK for HTML5) to create a more immersive mobile ad experience, improving completion rates and video ad revenue.

Smartch is a creative startup specialized in Learning & Development experiences. I joined the team to support the design system expansion and contribute to the integration of their main platform, Andragog. Responsibilities & Impact: - Built reusable atoms, molecules, and components in Storybook, helping to accelerate UI integration and standardize the frontend architecture; - Implemented unit, integration, and end-to-end tests using Jest, significantly improving code reliability and reducing bugs in production; - Collaborated closely with the design team through Chromatic to validate components visually, reducing design/dev feedback loops by 40%; - Integrated validated UI components into the main application using React, RTK Query, and GraphQL, contributing to a more consistent and maintainable user interface; - Participated in all Agile rituals (Scrum & Kanban), and contributed to a robust CI/CD pipeline using GitLab for smooth and continuous delivery; Worked within a team of 3 senior devs, 3 junior devs, 2 Product Owners, and a CTO, ensuring strong collaboration between tech and product. Stack: React, TypeScript, Redux Toolkit, RTK Query, GraphQL, Chakra UI, Emotion, Framer Motion, Storybook, Chromatic, Jest, GitLab, Jira.

SoixanteSeize is a creative agency specialized in digital advertising and information systems. I contributed to several client projects, with a focus on delivering performant and scalable frontends. Responsibilities: - Developed and maintained high-conversion landing pages for marketing campaigns; - Helped design and build websites and mobile applications, closely collaborating with the design team and project owners; - Integrated third-party APIs like Snipcart (e-commerce), Google Maps (location services), and Mailchimp (email automation). Stack: TypeScript, Apollo GraphQL, React, Gatsby, React Native, NestJS, Sass, Sanity CMS, MongoDB. Impact: - Improved conversion rates through optimized, mobile-friendly landing pages; - Accelerated development cycles by leveraging reusable components and Gatsby’s static rendering; - Enhanced user experience across client projects (performance, accessibility, SEO); - Enabled better campaign performance tracking and automation through seamless API integrations. Team setup: - Project team: 1 Project Manager, 1 Lead Dev, 1 Senior Dev, and myself; - Design via Figma/Framer, project tracking with Jira, daily Git workflow with rebase, PRs, and code reviews.

Besoin achats pour des pièces élémentaires, famille d’achats : prestation de sous-traitance. Définition du besoin achats avec le bureau d’études. Lancement des RFI de manière à collecter et analyser des informations sur les fournisseurs. Sourcing des fournisseurs qualifiés. Management des fournisseurs stratégiques. Conduite des négociations tarifaires et contractuelles.

Managed strategic procurement for mechanical and electronic components (collectors, encoders, potentiometers, passive electronics), representing €300K annually, i.e., one-third of the site’s total purchasing spend. Worked closely with the engineering team to define technical requirements, launch structured RFIs, conduct supplier sourcing, comparative analysis, negotiations, and manage contractual aspects. Key Achievements & Impact: - Achieved 5% cost savings on my procurement perimeter in the first year (~€15,000 saved) - Implemented tooling improvements to streamline supplier consultation and decision-making - Contributed to a payment terms extension campaign, improving cash flow - Strengthened cross-functional collaboration with R&D, improving procurement lead times - Ensured ongoing supplier performance tracking with key purchasing KPIs

Besoin achats Light Programs (PSA/RSA), famille d’achats : coiffes, mousses, pièces plastique, accessoires. Définition du besoin achats avec le chef de projet. Suivi du budget cible en fonction du budget du programme. Analyse comparative et choix des fournisseurs (sourcing, QAF, RFQ). Suivi des fournisseurs, comprenant la gestion des commandes, le support technique en matière de changement de conception. Définition de la stratégie fournisseur avec l’acheteur Commodités.

Rédaction et actualisation de BOM en accord avec la diversité produit. Intégration des BOMs dans PLM, validation des jalons. Proposition de concepts, benchmark de solutions, maquettage et compte rendu au client. Réalisation des PBOMs (Preliminary Pictorial Bill of Materials) pour le pôle achat (caractéristiques matériaux, quantité par véhicule, prix pièce, marquage, spécifications). Définition des OQ Sections (Optical Quality Section). Participation à l’élaboration des AMDEC. Gestion tous les points bloquants en développement et proposition de solutions alternatives. Pilotage des études (confort, CAO, mousses/coiffes/plastiques, intégration et validation). Réalisation des devis (cahier des charges, négociation, livrables). Management des projeteurs, selliers, expert métier, prototypistes et fournisseur

Analyse et proposition de solutions innovantes et existantes Gestion des maquettes 3D (diversité siège, intégration des DFN 3D, suivi de réalisation des 2D). Simulation 3D des essais règlementaires (ECE 14/17/21 ; Appui Tête ; Airbag ; Point d’ancrages ; Confort). Gestion de la maquette physique (usinage et suivi du maquettage siège proto (sellerie, proto métal). Enumération des risques potentiels pour les revues AMDEC.

- Mechanical engineering support for structural design in division R&D of AAT Composites - Involving, contributing and following activities in R&D to project Magellan RECARO - Ensuring, suggesting innovative solution and providing preliminary design - Realizing functional analyzes and analyze risks (FMEA) for different work packages - Conceptual and detailed 2D/3D and interface design - Dealing with quality issues and deviation of dimensions - Creation of and assembly drawings - Compiling design & project documentation - Performing project management - Test sample manufacturing management

- Définition de l'activité FAI (First Article Inspection) - Analyse des exigences qualités des dossiers FAI pour clients (Dassault Aviation, Eurocopter, Airbus, Embraer, Gulfstream) - Clarification des exigences des dossiers FAI pour les responsables qualités de Daher-Socata/Sous-Traitance - Harmonisation et création de méthodes et d'outils pour l'activité FAI

Training Engineering dans le service Recherche et Développement de GKN Aerospace Western Approch pour les programmes spars (ORS, MRS, IRS) de AIRBUS 350 XWB : - Formation au drapage de spar - Essai fibre de carbon en fonction de la dilatation thermique, résistance à l'humidité et la tenue en température - Analyse, prise de mesures sur les retassure, cavités et irrégularités du aux rides sur pièce composites - Rédaction de documents de fabrication

Voiturier des Restaurants, le Thoumieux, le Matignon, le Caffé Burlot Thiérry Costes & le Marco Polo : - Pris en charge des véhicules (parking, surveillance, restitution)

employé Mulit-Taches du Restaurant Sushishop : - Livraison des colis chez les clients - Manutention et gestion du stock de nourritures du Restaurant - Approvisionnement du Restaurant

Stage de Master 1 dans le bureau d'études de Primus Composites (Group Triumph) à Farnborough pour les programmes Dorsal Fin, Fin Tip, VT Fairing & Umbrella de AIRBUS A320, A330, A350 XWB : - Analyse des dessins de définition, spécifications Airbus pour la mise en place des éprouvettes composites Dorsal Fin, Fin Tip - Conception 3D & 2D sur CATIA V5, recherche de sous-traitants, mise en place des éprouvettes en fabrication - Rédaction de documents de fabrication - Participation aux activités de productions, mise à jour de documents de fabrication des pièces composites VT Fairing - Participation aux activités de R&D, conception 2D & 3D sur CATIA V5, rédaction de documents de fabrication pour la pièce composite Umbrella

Stage de Licence de le centre d'excellence Composites : - Rédaction de documents d'utilisation des Autoclaves - Analyse de données Autoclaves - Création de méthodes et d'outils pour le chargement des panneaux de nacelle en Autoclaves

Stage de DUT dans le service de production : - Création d'une base de donnée des produits - Préparation du site de production et déplacement - Optimisation et organisation du stock des produits.