Freelancer profile translated to English.
Back to original languageAbout François
⚡️DeveloperReact.js Next.js |UI / UX designer
🥇8 yearsof experience · ⭐ 5/5 on+85 projects🚀 Immediate availability
💡 Developer + Designer + AI Agent,by the same person.
📩 Your project in 15 min.
Your idea deserves more than just a prototype.
As a senior React.js developer and AI expert (AI agents, RAG), I turn it into a complete product (Next.js, Supabase, embedded AI), high-performing and turnkey.
I will guide youon every technical and product decision, so youmaintain controlover what you launch.
🎨 Starting from scratch, without a design?
I design the UX and mockups before development.
🤖 Want to integrate Artificial Intelligence into your product?
Chatbot, AI agent, RAG: I integrate these AI agents (Claude by Anthropic, OpenAI) directly into your Next.js product, connected to Supabase.
How I help my clients go from idea to product:
1️⃣ Design & develop your Next.js product from A to Z
→ Next.js · React.js · Supabase · TypeScript
→ API integrations & AI agents
→ Dashboards, Supabase auth, Stripe payments
2️⃣ Decide with full clarity
→ A React.js developer who explains every choice (costs, risks, impact)
→ You know where the budget is going and what it brings
→ Full control after delivery (access, docs)
3️⃣ Refine UX and design
→ Pixel-perfect Figma integration
→ Landing pages that convert
→ Fast React.js applications, designed to grow
🚀 My method
React.js developer & designer mastering **Artificial Intelligence**, I make every step clear, concrete, and transparent: why a choice, **how it works**, what are the next steps.
Result: a reliable, scalable product.
📩 Let's scope your project in 15 min: feasibility, budget, deadlines, no commitment.
🛠 Stack: React.js · TypeScript · Next.js · Supabase · Claude API · OpenAI · RAG · AI Agent
French
Native or bilingual
English
Fluent
Spanish
Conversational
Remote only
Primarily works remotely
Experience
- Athletic Zone Ajaccio
On Malt
AI Agent Developer | AI Chatbot for booking & SMS reminders for a gymSPORTSJuly 2026 - July 2026Ajaccio, France🎯 The CompanyAthletic Zone, a gym in Ajaccio. Its manager, a sports coach, receives over 100 coaching bookings per month, scattered across WhatsApp, SMS, and Instagram. As a web developer specializing in AI agents, I designed and deployed an AI Agent (Artificial Intelligence) that automates the entire management of bookings and customer reminders.🎯 Missions- Conversational AI Agent design (Claude by Anthropic, via Vercel AI SDK): the coach forwards a client message, the AI Chatbot understands the request (text or screenshot analyzed by AI vision), creates the booking, and schedules the SMS reminder.- Node.js web development: 9 business tools (clients, bookings, reminders), Google Calendar, Google Sheets, Twilio, Telegram integrations.- Reliability: transactional writes with rollback, idempotent reminders (zero double SMS), time zones, anti-hallucination safeguards (no AI-guessed dev identifiers).- Deployment: serverless webhook on Vercel, Upstash Redis sessions, GitHub Actions cron jobs.🎯 Organization and MethodologyFully autonomous web developer, direct contact with the manager. Weekly sprints, from scoping to deployment. QA via multi-agent workflow (automated tests + independent AI judges) before production GO, with the same rigor as my fixed-price web development missions.🏆 Impact and Notable Results- Over 100 bookings/month automated via the AI Chatbot, ~5 seconds of handling per booking on the coach's side.- Zero change in habits for end clients: they message the coach as before.- Total operating cost: ~€5/month (AI + SMS).🎯 Technical Context- Artificial Intelligence: Vercel AI SDK, Claude Haiku 4.5 (Anthropic), OCR vision.- Backend: Node.js 20, Vercel serverless webhook.- Data: Google Sheets, Google Calendar.- Messaging: Twilio (SMS), Telegram Bot API.- State: Upstash Redis.- CI/cron: GitHub Actions - LINK TRAVAUXNext.js / React.js Developer & AI Agent | AI Quote Analysis SaaSCIVIL ENGINEERINGMay 2026 - June 2026 (1 month)Nice, France🎯 The CompanyLink Travaux helps individuals verify construction quotes before signing: PDF upload, an AI agent analyzes it on 20 criteria (cost consistency, VAT, ambiguous areas, risk clauses) and delivers a report with a score and negotiation advice, in addition to the expertise of a construction broker, encoded into a product.As a web developer and UX/UI designer, I designed and developed this SaaS from scratch in React.js / Next.js: design, AI engine, payment, and deployment.🎯 Missions- UX/UI Design: landing page, animated results page (streaming), web + branded PDF reports.- Hybrid AI agent engine: common criteria coded + business criteria evaluated in PDF vision, code calculates, AI reads.- Anti-hallucination safeguards: closed enums, language prohibitions, noisy failure over silent default.- Supabase Backend: Postgres, signed-URL upload to Storage, SSE progress via database events, atomic SQL guards.- Cost/latency optimization: multi-model routing, prompt caching, forced tool use, pipeline latency -54%.- Durable Vercel Workflows, Stripe paywall, anti-abuse (rate-limiting).🎯 Organization and MethodologyFully autonomous web developer, direct contact with the founder. Mission scoped in 3 lots, V1 delivered in 5 weeks. Quality driven by evaluations: ~15 rounds of independent AI judges on real PDFs + non-regression on golden set.🏆 Impact and Notable Results- 0 confirmed hallucination on 11 real quotes (3 independent judges).- Reproducible score between runs (deterministic engine), AI cost ~€0.15/analysis.- Lighthouse 60 → 93, platform in production with real payments.🎯 Technical Context- Framework: Next.js 16, React.js 19, TypeScript.- AI: Claude / Anthropic API, AI agent, PDF vision, tool use, prompt caching, evaluations.- Backend: Supabase, Upstash Redis, Vercel Workflows · Payment: Stripe.- UI: Tailwind CSS 4, Framer Motion · Vitest, Sentry
- Mon courtier énergieReact.js Next.js Developer & UI/UX Designer | Design & development of a SaaS platformENERGY AND UTILITIESApril 2026 - Today (4 months)Bordeaux, France🎯 The CompanyMon Courtier Énergie, a national network of B2B energy brokers. Dual role as a web developer and product designer: complete UX/UI design on Figma, then React.js development of "MCE Connect", the brokers' SaaS platform (electricity/gas offer comparator, client portfolio, quotes).🎯 Missions- UX/UI Design: complete Figma mockups (~30 screens), art direction, component library, and design system — validated in demo by the product team.- React.js 19 development: KPI dashboard with custom SVG charts, multi-step quote wizard, cancellation workflow, portfolio management.- Coded design system (Tailwind CSS 4 + DaisyUI), pixel-perfect integration of mockups.- Real-time Enedis (SGE) and GRDF API integrations, secure HTTP-only cookie authentication.- i18n for 3 languages, migration of a module to Next.js.- Vitest + Playwright tests, GitHub Actions CI/CD.🎯 Organization and MethodologyFully autonomous web developer for design and all front-end, direct contact with the CTO and PM, daily coordination with the backend team. 240+ commits, 50+ tickets delivered, 5 releases in 4 months.🏆 Impact and Notable Results- Art direction adopted as the new visual standard for the brand.- ~30 screens designed on Figma then integrated in React.js.- Platform in production with regular releases.🎯 Technical Context- Framework: React.js 19, Vite, TypeScript (+ Next.js 16 module).- Design / UI: Figma, Tailwind CSS 4, DaisyUI, custom design system.- State / Data: Redux Toolkit, RTK Query.- External APIs: REST, Enedis SGE, GRDF.- i18n: i18next (FR / EN / ES).- Tests: Vitest, Playwright.- Deployment: GitHub Actions, AWS S3
Reviews
Maxime
CEO - privize.io
Reviewed on 7/17/2026
Top
S
Sylvain
Coach sportif - Athletic Zone Ajaccio
Reviewed on 7/16/2026
I hired him to develop a custom AI agent that automates my bookings. Very satisfied with the result. Simple communication, deadlines met, and he supported me through to deployment. The artificial intelligence works well and saves me a lot of time daily. He truly masters his subject, both in web development (Next.js, React.js) and in AI agents and automation. I recommend him without hesitation if you are looking for a developer for an artificial intelligence-based solution or a web application.
Recommendations
LC
MP
+4
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Education
- Computer solutions designer and developer, Information technology / computer systems technology422021Activités et associations : Membre de l'association étudiante CPP Vice Président de l'association Le bouchon 42, c’est la première formation en informatique entièrement gratuite, ouverte à tous et accessible aux 18-30 ans. Sa pédagogie, c’est le peer-to-peer learning : un fonctionnement participatif qui permet aux étudiants de libérer toute leur créativité grâce à l’apprentissage par projets. L’établissement a été fondé par Florian Bucher, Xavier Niel, Nicolas Sadirac et Kwame Yamgnane en 2013 alors que l’industrie du numérique est en plein manque de développeurs informatiques en France. Pour former en grand nombre les meilleurs talents de demain, l’école met à disposition la meilleure infrastructure dans un lieu unique et moderne.
- Master, Science and technique of physical and sports activitiesUniversité Paris Cité2017Activités et associations : Membre de l’épicerie solidaire qui lutte contre la précarité étudiante Organisation des compétitions inter-universitaires La formation vise à développer des compétences dans le domaine de la conception, du pilotage et de l’expertise de programmes d’entraînement, d’optimisation de la performance sportive et de ré-athlétisation. Il s’agit d’une formation pluridisciplinaire qui articule des enseignements scientifiques (dans les domaines des sciences de la vie, sciences humaines, sciences sociales, et sciences pour l’ingénieur), technologiques et professionnels.
Certifications
- Codin Game Javascript CERTIFICATION Web DeveloperCodin Game2023
- Codin Game Typescript CERTIFICATION Web DeveloperCodin Game2023