Freelancer profile translated to English.
Back to original languageAbout Jules
👨🏻💻 Web developer with over 5 years of experience, specializing in creating UI/UX designs and developing fluid user interfaces. My professional experiences have allowed me to successfully complete projects exclusively for startups and companies of various sizes.
💡 Projects:
Web Applications:Design and development of reliable and scalable web applications, precisely meeting user expectations with an intuitive and secure interface.
E-Commerce:Creation of complete online stores, integrating secure payment management and custom features.
Showcase Sites:Frontend development of modern and dynamic sites, designed to enhance the image of companies, creators, or independent workers.
⚡️ My skills in action:
💻 Web Development | Front-End:
➡️ Design and frontend development of web applications and sites.
➡️ Frontend development withReact.js, Next.js, Vue.js, TypeScript, JavaScript.
➡️ Use ofCSS/SASS, TailwindCSS, MaterialUI.
➡️ Integration of mockups fromFigma.
➡️ Integration ofBaaS solutions with Supabase and Firebasefor managing authentication, real-time databases, and file storage.
➡️ Development of Serverless architectures for modern web applications.
🖌️ UI/UX Design:
➡️ Creation of web mockups withFigma.
➡️ Design of modern andresponsiveuser interfaces.
✉️ Contact:
➡️ Quick response in less than an hour.
➡️ Available 7 days a week via Malt messaging.
Contact me to discuss your projects and find the best solutions together to achieve them.📋
French
Native or bilingual
English
Fluent
Spanish
Conversational
Portuguese
Basic
Can work on-site
Paris (up to 50km), Nantes (up to 50km), Lyon (up to 50km), Orléans (up to 50km), Lille (up to 50km)
Experience
- Cosmo5 FranceFront-End Developer / Next.js — Marketing Dashboard FinalizationCONSULTING AND AUDITSJanuary 2026 - Today (5 months)Paris, France
Media Steering Dashboard | AdTech / Performance Marketing
Context: SaaS media reporting platform for advertisers and agencies. Mission initiated in January 2026, ongoing, integrated with the product team with weekly interventions.Client Problem: Slow prototype dashboard (+4s load time), not scalable, impossible to deploy to new clients in its current state.What I delivered (and continue to develop):- Performance ×3: Loading reduced from 4s to <1.5s (smart cache, optimized BigQuery queries).- Advanced analytics views: Media funnel, top creatives, time comparisons (previous year, previous period), multi-dimensional breakdowns.- Custom administration interface: Client management and onboarding without technical intervention.- Extensible metrics system: 130+ business KPIs (CPM, ROAS, CAC, video completion rate...) with automatic propagation across all views and filters.- Documentation of architectural choices and data dictionary (KPI definitions, calculation rules) to facilitate onboarding by the internal team.Stack: Next.js · TypeScript · Prisma · BigQuery · TanStack Query · Zustand · Zod · Tailwind · shadcn/uiImpact: Product in production, used daily for media campaign steering by several advertisers in luxury, fashion, and cosmetics. - Matrix MindFront-End Developer | Next.jsPHARMACEUTICALS INDUSTRYApril 2025 - October 2025 (6 months)Paris, France
Creation of the Matrix Mind product (Chatbot for medical devices):
- Complete frontend design and development in Next.js with a modular and performant architecture for a fluid and responsive experience.- Integration of Outseta for SaaS subscription management (Individual, Company, Enterprise plans), authentication, and billing, as well as user and rights management.- Connection of the frontend to internal APIs via TanStack Query, without direct backend management, ensuring maintainable code and efficient communication with the backend team.- Development of an AI chatbot specialized in regulatory standards (FDA, MDR, ISO 13485…), allowing complex questions to be asked and reliable answers to be received.Technical Stack: Next.js, Outseta, TanStack Query, Zustand, Zod, TypeScript, Tailwind CSS, Vercel.Result:Launch of an innovative SaaS product, the first AI chatbot dedicated to MedTech regulatory experts, simplifying regulatory compliance and ensuring accurate and secure responses 24/7. - Matrix OneFront-End Developer | Next.js, StoryBlokPHARMACEUTICALS INDUSTRYOctober 2024 - Today (1 year and 8 months)Paris, France
Showcase site & web platform | MedTech
Context: Long-term collaboration (since October 2024) with Matrix Requirements, which became MatrixOne after an acquisition. Continuous support on site evolution, in direct contact with the Growth team.What I achieved:- Complete site redesign following the acquisition: redesign, new brand identity, technical migration with redirection management to preserve existing traffic.- SEO & Analytics: SEO optimization, Google Tag Manager & Google Analytics configuration for performance and user behavior tracking.- HubSpot Integration: Implementation of contact and demo request forms, lead generation, connected to the Growth team's CRM.- Responsive design: Complete adaptation of the site for mobile and tablet.- Continuous maintenance & evolution: New features, performance optimization, content management via Storyblok.- Growth Collaboration: Active communication with the Growth team to align the site with acquisition and conversion objectives.Stack: Next.js · TypeScript · Storyblok · Vercel · HubSpot · Google Tag Manager · Google AnalyticsResult: Site in production, traffic and SEO continuity ensured despite the rebranding, lead pipeline operational via HubSpot.
Reviews
Madrid
Développeur - agence MADrid
Reviewed on 2/6/2026
Jules led the project with speed and agilely overcame difficulties. I recommend his services with my eyes closed!
P
Paul
Matrix Requirements
Reviewed on 4/24/2025
Reliable, good communicator and adaptable. I recommend.
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Education
- General Baccalaureate, EconomicsLycée Rémi Belleau2017Baccalauréat général, Économie
- RNCP Title of Application Designer Developer Level 6Wild Code School2023
Certifications
- RNCP Web and Mobile Web Developer Level 6Wild Code School2023